Ask Caleffi
Welcome to the Ask Caleffi podcast series, now featuring our powerhouse tech team! Join Cody, Ryan, Matt, and Dan as they dive into the tricky heating and plumbing challenges they tackle every day.
These field experts share real-world insights to help contractors navigate even the toughest jobs with ease. Count on the team to keep things lively, mixing professional wisdom with the entertaining, relatable stories you’ve come to love.
Ask Caleffi
#9 The heat is on... but for who?
Use Left/Right to seek, Home/End to jump to start or end. Hold shift to jump forward or backward.
It can be a time-consuming project to troubleshoot why a zone relay board doesn't "appear" to be working, especially when the heat is literally ON for the contractor, but OFF for their customer.
Greg and Dan take our audience through a step-by-step process of isolating and solving the "no-heat" calls including how to locate the source of the power loss. It's (another) don't-miss episode!
Want to hear YOUR QUESTION on Ask Caleffi, take this quick 4 question survey for your chance to hear your question in a future episode.
00:02
[Music]
00:06
welcome to ask Caleffi
00:08
the podcast that dives into real-life
00:10
problems that plumbing and hvac
00:12
technicians face in the field
00:13
we're your hosts from the Caleffi tech
00:15
support team i'm greg tubbs
00:17
and i'm dan firkus welcome we look
00:20
forward to sharing some stories from our
00:21
tech calls and using our background and
00:23
expertise to make your days a little
00:28
easier
00:30
hey there welcome back here we are on
00:32
episode nine we're going to be talking
00:34
about troubleshooting
00:35
zone relays today how we doing dan we're
00:37
doing good welcome back everybody thanks
00:39
for tuning in
00:40
so today's topic can get pretty time
00:43
consuming
00:44
real fast i mean you know we'll try to
00:47
keep this discussion
00:49
as more of an overview listeners
00:52
if you're having issues just give us a
00:54
call because these things can get off in
00:55
the weeds
00:56
real fast absolutely there's a you know
00:58
a lot of different directions you can
01:00
take this i think we're going to do just
01:01
an overview on troubleshooting today
01:03
yeah i mean we get plenty of calls from
01:06
contractors
01:06
toward usually towards the end of the
01:08
day i was just going to ask you what
01:09
time of day do you get those calls greg
01:11
i mean it's all times of the days let's
01:13
be honest
01:14
i mean it seems the majority of them
01:16
during heating season come in the end of
01:18
the day they just got done with a tr
01:20
uh with a replacement or trying to get
01:23
the heat going yeah trying to get the
01:24
heat on
01:25
and they throw the switch the homeowners
01:28
standing there
01:29
and things don't go the way they're
01:31
supposed to lights go out
01:32
and literally the heat is on yeah
01:36
well the heat's on for them not for the
01:38
customers right that's right
01:39
well we've both been there boy that
01:41
reminds me of a call i had last week
01:43
yeah there's a contractor out in
01:45
minnesota he had
01:46
one of our zone valve relays evr boards
01:49
sure
01:50
and he was using our valves and they
01:51
were new valves new board
01:53
um and he was calling me to confirm that
01:56
our board had shorted out and he needed
01:58
to run to the supply house and pick up a
02:00
warranty board
02:02
and get that replaced so before i just
02:05
gave him the nod and okay to
02:07
run off and do that i started asking
02:09
them some questions and
02:10
pushing them through some steps and he
02:14
tried resetting the power
02:15
and the board wouldn't come back on so i
02:17
had him
02:19
you know initially disconnect all his
02:20
thermostats and disconnect all his zone
02:22
valve wiring so it was just a plain
02:24
board
02:25
no low voltage wires connected and i had
02:27
him reset the power and lo and behold
02:29
the board came
02:29
on the power light was on board was
02:32
working
02:33
imagine that yeah and that's that's what
02:35
we got to start off with right
02:36
we gotta eliminate the problem you know
02:39
we want to be able to verify that
02:40
it's the board or it's something outside
02:42
the board yeah so long story short with
02:44
that and we'll get into the
02:45
troubleshooting side
02:47
as we started jumping out and testing
02:49
the board
02:50
and found out the board was working well
02:52
we started to
02:53
reconnect the thermostats and all of
02:56
them work
02:57
they called for heat lights came on
02:59
started reconnecting the zone valves we
03:01
got to the third zone and he reconnected
03:03
that valve and tested it and boom the
03:05
board went out
03:07
you know which then immediately he
03:09
looked at the zone valve
03:10
oh i must have a bad relay or a bad
03:12
actuator sure
03:13
it's a brand new clefty actuator plugged
03:15
in there oh boy
03:17
so had him go down disconnect the
03:20
the actuator um and ohm his wire out and
03:23
he had to short it
03:24
low voltage wire wow imagine that well
03:27
this
03:27
and this valve was located away from the
03:30
control and had an existing low voltage
03:33
wire in place so he had used an existing
03:35
wire
03:36
only to find out that there was a short
03:38
in the existing low voltage wire
03:39
right and we find that a lot especially
03:42
in change outs where either they never
03:44
had a panel
03:45
or they did a complete boiler upgrade
03:48
but
03:48
you know they've always had zone valves
03:50
and remote locations in the past and
03:52
right let's be honest we're going to
03:53
reuse the wiring if you can
03:55
yeah i mean you're trying to save time
03:57
and save time which saves cost and
04:00
you know you already have a zone valve
04:01
so you replaced it you put a new zone
04:03
valve in you put a new relay control in
04:06
but boy you know to string a new wire
04:07
and you know maybe you have to fish
04:10
a wire somewhere it's not that easy so
04:12
you know
04:13
it's just a wire yeah why wouldn't i
04:15
reuse it sure why not
04:17
you wouldn't think that would be a
04:18
problem but it's an older home maybe it
04:21
got rodent damaged
04:22
who knows i mean anything can happen all
04:24
i know is in talking to him he was
04:26
pretty excited because
04:28
he was ready to jump in his truck and
04:29
run to the supply house and get a new
04:31
board and come back
04:32
and rewire the entire board pull the old
04:35
one out put the new one in and he
04:38
hit the switch started powering on the
04:40
thermostats and had the same problem
04:42
and we've had them calls oh yeah i'm on
04:44
my third board and it's still doing the
04:46
same thing well guess what
04:47
you know what it probably isn't the
04:49
board you know i mean weird things
04:51
happen
04:51
but i doubt it's the board so then you
04:54
did the right thing
04:55
you walked them through isolating
04:56
everything off and kind of starting from
04:58
scratch and going one component at a
05:00
time
05:01
you think about it in the time it would
05:02
have taken him to get in his van drive
05:05
to the parts store
05:06
or to the supply house get a new board
05:09
he he ran a new wire and everything
05:12
worked and he was done
05:13
yeah looked like the hero all done and
05:16
he was running
05:17
right and builds confidence with your
05:19
customer certainly does
05:21
so zvr boards the valve boards a lot
05:24
more
05:24
things going on there with thermostats
05:27
the pumps and switches and switches and
05:30
the valves themselves
05:31
right right when we go from there to a
05:33
zsr
05:34
the pump relay a lot more simplistic
05:37
yeah a lot simpler on the low voltage
05:39
side
05:39
yeah it's thermostats that's right right
05:42
yeah it's
05:43
pretty easy sure yeah with that board
05:46
you're just bringing power in
05:48
um one thing nice about our boards
05:50
whether it's a zvr or zsr
05:52
board is that it has a transformer so
05:55
the zsr is going to be built onto the
05:58
board it's going to be soldered onto the
05:59
board
06:00
where the zvr is going to be exterior
06:02
mounted in the cabinet
06:04
and it plugs in with a four prong molex
06:06
plug into the board
06:09
yeah that's exactly it and the nice part
06:12
about the zvr too
06:13
is say you have multiple zones
06:17
where you have multiple actuators
06:20
getting wired into one zone
06:22
you can add some uh some expansion
06:25
yeah by by installing that expansion
06:27
transformer and plugging it into
06:29
the factory setup of uh molex plugs
06:32
there
06:33
right yeah you can take it from the
06:34
standard 4d v8
06:36
transformer zvr 103 and 104 right
06:39
yep to the 80va yeah and the zvr 106
06:43
comes with 80va where the transform it
06:45
comes with two of them
06:46
ready to go right but you know you you
06:48
get into
06:49
you know some of competitors you know
06:51
actuators where they have a real high va
06:53
draw
06:54
for opening um if you have those on a
06:57
three or four zone panel with a 40v8
06:59
transformer you can easily add that
07:00
expansion to get adva
07:03
and power those higher higher va
07:05
transformer or
07:06
actuators sure so
07:09
kind of getting back into some of the
07:11
troubleshooting um
07:13
maybe we slow it down a little bit and
07:14
kind of pick that apart yeah i think we
07:16
should
07:17
so number one i think you want to locate
07:20
the cause of the power loss right
07:23
that's really what we had to do sounds
07:24
easy yeah it sounds easy it sounds real
07:26
easy
07:27
but by isolating everything off
07:29
thermostats
07:31
zone valves then you're plugging one
07:33
component in at a time
07:35
however you want to do that you can go
07:37
one thermostat one zone valve so start
07:39
with zone one
07:40
and start plugging them in make the call
07:42
for heat right if everything kicks on
07:44
pump runs all that works well without
07:47
overheating that that mov
07:49
in there um we know the dead zone's fine
07:52
right so then we continue that process
07:54
keep on going down the line until
07:56
you have one that trips that thing out
07:59
yeah well and that's an easy way
08:01
to you know quickly find out what is
08:04
causing the problem
08:06
but if you're convinced it's the board
08:07
that's causing the problem one nice
08:09
thing
08:09
i like to do you know once i get
08:11
everything disconnected i'd like to
08:13
you know i mean ideally i'd like you to
08:16
have a meter
08:17
and go through and check for your
08:18
voltages at your thermostats check your
08:20
pumps
08:21
um check your actuators you know your
08:25
motor terminals for your actuators for
08:27
voltage
08:28
but you can make a simple jumper wire
08:31
and
08:31
run the board through its paces jump out
08:33
the r w at the thermostat see if the
08:35
light comes on and it calls
08:37
on a pump relay see if you get 120 volts
08:39
at those pump terminals
08:41
right you got a valve relay look for 24
08:43
volts at the pump
08:44
at the motor terminals at the motor
08:46
terminals and then
08:48
in order to verify that that part works
08:51
i mean typically you're gonna see a
08:53
light on only when
08:55
the end switch is made right so you need
08:58
an end switch
08:59
or a jumper wire to jump out the end
09:01
switch terminals
09:02
of the board just to verify and then you
09:05
know it'll close the xx terminals for
09:07
the boiler
09:09
because that's just a dry to contact
09:10
right and then it'll also send 120 volts
09:13
to the system
09:14
pump right yeah and then that's one
09:17
thing
09:17
important to remember is that you know
09:19
for you guys who use two-wire zone
09:21
valves
09:22
you can use them with our boards but you
09:24
may notice that
09:26
okay thermostat light came on my zone
09:28
valve powered open but boy my pumps or
09:30
my end switch aren't coming on
09:32
yeah i'm sorry pumps or um pump yeah or
09:34
end switch
09:35
which light is not coming right yep yeah
09:38
and then you don't get
09:39
a end switch closure on xx in the upper
09:42
upper right hand corner left hand corner
09:45
there and you don't
09:46
get uh pumps energized right and you
09:49
what you won't
09:50
until it sees the end switch closed so
09:52
that you know it's set up to where
09:54
your thermostat needs to call and the
09:56
end switch for the actuator needs to
09:58
close
09:59
before that board will turn the boiler
10:00
or pumps on so if you have that two-wire
10:02
actuator
10:03
it's important to make sure you put a
10:05
jumper in at your end switch terminals
10:07
so that
10:08
that board will go into the next step
10:10
well i think the biggest thing to
10:11
remember is that we have that resettable
10:13
link to protect that transformer so
10:16
you know if you if if you see that go
10:18
out and you reset the power to the board
10:20
and you see it doesn't come back on it's
10:23
kind of time to rewind
10:24
yeah it is i agree and that's that's a
10:27
resettable fuse
10:29
well let's rewind a little bit let's
10:31
kind of go back and talk about
10:33
the troubleshooting maybe we can kind of
10:34
touch on the specifics of the
10:36
of these boards yeah that's a great idea
10:38
why don't we start with the zvr series
10:40
that's the
10:41
the board that i just talked about from
10:43
the tech call i shared
10:45
right that's perfect you know we offer
10:47
three different
10:48
models of the zvr a three zone the zvr
10:51
103
10:52
yeah a four zone the zvr 104
10:55
and a six zone the zvr 106. so that's
10:58
going to take care of
10:59
anything with zone actuators or zone
11:02
valves
11:02
right yeah and we're not going to talk a
11:04
lot about the details we're going to
11:06
spend a lot of time talking about
11:07
troubleshooting but
11:08
just for knowledge those boards can be
11:10
all connected together to
11:12
you know allow many boards to be added
11:14
or
11:15
unlimited amount of zones yeah so
11:19
but yeah when you look at those boards
11:21
what's nice is that you know they have a
11:23
transformer provided with them
11:24
so for a zone valve relay board your
11:27
your
11:28
valve actuators are going to be all
11:30
powered on low voltage 24 volts so it
11:32
has
11:33
the transformer with it and
11:36
actually that transformer is externally
11:38
mounted in the cabinet
11:39
it's not soldered onto the board it
11:41
plugs in with the four prong molex plug
11:43
right so the zvr 103 and zvr 104 come
11:47
with a singular
11:49
40va transformer and you have the
11:52
capability
11:54
of plugging in an additional 40 va
11:56
transformer for
11:57
those systems that have multiple
11:58
actuators where maybe a 40 va
12:00
transformer isn't enough power to do it
12:02
yeah it's nice we have a big cabinet
12:04
that that board is enclosed in it'll
12:06
allow space to
12:08
put that second transformer if you need
12:10
that absolutely so you can
12:11
put 80 va where the transformer where
12:14
the zvr 106
12:15
automatically comes with two 40 va
12:17
transformers that you plug in when you
12:19
get it installed
12:20
and and they're ready to go with 80 vh
12:23
of transformers right
12:24
yeah so you'll get you'll get power for
12:26
your thermostats um
12:27
or your zone valves right from the
12:29
onboard transformer so all you really
12:31
need to do for a power source is bring
12:32
120 volts into that board
12:34
right you know from there you know it's
12:37
great
12:38
you know we have thermostat terminals
12:40
for each of the zones
12:41
at the thermostat terminals you know you
12:44
have your
12:45
your r and your w terminal and you also
12:47
have your c your common terminal for
12:49
those power robbing or or smart
12:51
thermostats so you can power those right
12:52
off the board
12:54
directly below them at the same zone
12:56
location you're going to have
12:57
a location to wire in your zone valves
12:59
you're going to have two motor terminals
13:01
and two switch terminals for end switch
13:04
right
13:04
and that end switch has got to be wired
13:06
right definitely has to be wired
13:09
yep it's looking for that end switch to
13:12
close
13:12
for that board to go into the next step
13:14
of its of its operation
13:16
right which would be energizing the xx
13:19
terminal to bring on the boiler
13:21
and then also powering the the pumps
13:23
through the relay
13:24
right so when you look at wiring you
13:26
guys are going to find it they're pretty
13:27
simple to wire
13:28
thermostat ties into the zone thermostat
13:30
location
13:31
the corresponding valve ties into the
13:33
valve location
13:35
you'll do that for zones one two three
13:38
or all the way through six or as many
13:39
zones as you have right
13:41
and the only time it really gets muddy i
13:43
think is when you got
13:45
somebody trying to wire in like an old
13:46
taco 570 series that three wire
13:49
that sucks a lot of juice um or one of
13:52
the weird
13:53
like white rogers four wires sure that
13:56
get wired totally different and
13:57
if you ever need help with wiring those
14:00
please call us
14:01
call call in and we'll we'll get you
14:03
through it yeah we i mean
14:04
i know we have some wiring diagrams in
14:06
our wiring guide that show how to tie
14:08
those in but we're always here as well
14:10
um so one nice feature as well is that
14:13
you'll be able to tie in
14:14
a system pump a secondary pump or a zone
14:17
one pump
14:18
right into that board the zone one pump
14:20
would be used if you're setting up a
14:21
priority it gives you the ability to
14:24
to control up zone one as a pump versus
14:26
a valve in a priority application maybe
14:29
for domestic hot water
14:30
right provided you install the jumper in
14:33
the end switch
14:34
exactly yep that's for sure we get that
14:36
an awful lot and
14:37
they get everything down to the wire and
14:40
everything's working but that
14:41
yeah well i don't have a i don't have an
14:43
actuator on that it's just the pump
14:45
okay all you need to do is slide that
14:46
inside that piece
14:48
two wire in there a single wire in there
14:50
and it
14:51
works right yep and then it'll give you
14:54
you know your end switch to turn your
14:56
boiler on it gives you an auxiliary
14:58
relay
14:59
and a zone one end switch for like your
15:01
modulating condensing boilers that might
15:03
have a separate end switch call for
15:04
domestic water that's right
15:07
but when you look at troubleshooting and
15:08
that's what we're going to focus on
15:10
today
15:10
you know that board has a built-in
15:14
uh resettable link that protects that
15:16
transformer protects the low voltage
15:18
side
15:19
provided you don't put too much juice
15:21
through it
15:22
yeah yeah that's for sure i've seen
15:25
those
15:26
i've seen those get cooked before yeah
15:27
they do get cooked and
15:29
you wonder what they did to uh to fry
15:31
them but it has to be a pretty bad
15:32
short yeah um but so but that's exactly
15:36
what it's there for
15:36
it's to protect the board in the event
15:38
of a short so
15:40
you know you guys i shared that call
15:41
about the contractor
15:43
on site in minnesota having that board
15:45
short out
15:46
let's talk a little bit more about
15:48
troubleshooting so let's say you get it
15:49
connected you wire it up and you have
15:51
that
15:52
that resettable link go out and take the
15:54
transformer out what do you do then
15:56
well i think i'm i'm going to start off
15:58
with
15:59
isolating all the low voltage
16:02
components right off the board i'm
16:04
taking the thermostats off
16:06
and i'm taking the actuators off and
16:09
probably unwiring
16:10
the end switches because i mean it's
16:12
another rabbit hole we can jump down
16:14
we've had it where guys have wired the
16:15
end switch to the motor and then pin
16:17
that pin that thing
16:18
open which closes the switch and that's
16:22
a direct short right
16:23
right we've seen that happen too but but
16:26
for all practical purposes
16:28
we're going to isolate all the
16:29
components off and then i'm going to
16:31
start with plugging the transformer in
16:33
turning it on making sure the light
16:35
comes on nothing funny is happening okay
16:37
i'm going to wire well that's the big
16:39
key you know once once you get all your
16:41
low voltage wiring pulled off the board
16:43
and guys always i can almost hear them
16:45
cringe on the other end of the phone
16:46
when i tell them okay well
16:48
you know leave the power off to the
16:49
board and disconnect all your low
16:50
voltage wires it's like
16:52
you know much time i spent wiring this
16:53
board now you want me to disconnect
16:55
everything we need to do it you do
16:57
because you have so many different
16:59
avenues of where that short could be
17:01
right so like greg said and then reset
17:03
the power to it and if your
17:04
green power light comes on okay that's a
17:07
good sign
17:08
yeah then you start adding your your
17:10
pieces of
17:11
of the puzzle back together wire that
17:13
thermostat in
17:14
make sure the call for heat comes on
17:16
wire the motor wire the end switch make
17:18
sure that all comes on
17:20
if that's all good you move on move on
17:23
to the next zone
17:24
and continue to do the same thing you
17:26
know thermostat
17:27
light comes on for zone two you plug the
17:29
motor in
17:31
for the the zone valve and all of a
17:33
sudden the light goes off
17:35
all right what do we have going on
17:37
that's exactly what i had with that
17:38
contractor in minnesota do we have a
17:40
shorted wire
17:41
do we have a miswired zone valve far
17:43
away that we don't know about
17:45
because something is wrong there but you
17:48
know it's short
17:49
yeah you know i get that question a lot
17:50
with guys using thermoelectric
17:53
actuators yeah you know especially you
17:55
know not
17:56
not our brand but you know there's a lot
17:58
of different brands out there
18:00
but i'll get calls from contractors with
18:01
different brands and you know they give
18:03
you four color wires
18:05
yeah okay well what what two are the end
18:07
switch and what two are the motor
18:08
yeah is it is it yellow and red i mean
18:11
right well i bet i've had guys wire them
18:14
wrong where they wire the end switch to
18:15
the motor terminals and the motor
18:17
terminals
18:18
to the on switch and then the board
18:20
doesn't do any and then it doesn't do
18:21
anything but it doesn't short the board
18:23
out either no because that actuator is
18:25
is right now closed and the switch is
18:28
open so it just sits there
18:29
right right so you know then you know
18:33
i find myself a lot of times then
18:34
exploring the other manufacturer's zone
18:37
valve and helping them
18:38
right which is part of what we do help
18:40
you figure out which wires are actually
18:41
the end switch because
18:43
when we get off the tech call we want
18:44
you we want that board working
18:46
absolutely yeah so it really boils down
18:50
to
18:51
isolating the individual components out
18:53
and
18:54
going through it one step at a time now
18:56
you can test this with a meter too
18:58
i mean that's honestly if you want to
19:01
get good with your meter
19:02
learn how things how voltage travels
19:05
when everything is working
19:07
you know test between r and w on a call
19:09
for heat
19:10
you're not going to read 24 volts
19:12
because it's a closed circuit right
19:14
you go between r and common no matter
19:17
what you should read
19:18
voltage what about w and common great w
19:20
and common on a call for heat
19:22
you just completed the circuit so now
19:24
you're going to read
19:25
your low voltage 24 to 28 volts right
19:27
what about on
19:28
call that's on a no call for heat no
19:31
call for heat w to common
19:32
you should read zero volts yep
19:34
absolutely
19:36
all right it's a good way to test if
19:38
your thermostat is actually calling
19:39
yeah because i've had guys that have
19:41
done that well i just turned my
19:42
thermostat to heat and it's not calling
19:44
well a lot of the thermostats will have
19:47
um
19:48
delays built into they do so if you turn
19:51
your thermostat
19:52
on and you go back to your board and
19:53
it's not calling and you check between
19:55
r and c and you have 24 volts and you're
19:57
checking w to see and you don't
20:00
well that tells you that thermostat's
20:02
not completing the circuit to tell that
20:03
board to come on so you either have to
20:05
wait through
20:06
the delay um or find out what's going on
20:08
in the thermostat that didn't complete
20:10
that
20:10
yeah maybe the wire's not hooked up or
20:12
thermostat's in a delay or
20:14
sure who knows what right there's so
20:16
many different ways it could be
20:18
yeah and that's what makes us daunting
20:20
yeah well the
20:21
yeah it is and you know that's where
20:25
trying to determine is it a thermostat
20:27
issue is it an actuator issue is it a
20:30
board issue is it a piece of wire
20:31
sure i've seen new thermostat wire come
20:34
off the roll and be shorted internally
20:36
yeah and honestly i there's one
20:39
manufacturer
20:40
maybe a couple of them out there of
20:41
thermostat wire like they have that
20:43
strip string and if you pull hard on
20:45
that strip string and all of a sudden it
20:46
binds
20:47
guess what you're doing in there you're
20:49
actually skinning the wire off
20:51
and i had some not long ago where i did
20:53
that
20:54
and i stripped it all the way down i
20:56
think i stripped it about two feet in
20:57
and here three of the wires had been
20:59
skinned and if i would have applied any
21:01
power they would have shorted
21:02
right so just kind of let that be a
21:05
lesson to you
21:05
it doesn't take much no no it certainly
21:08
doesn't
21:09
so i think we've covered the the zvr
21:12
pretty well
21:12
we also have the zsr the pump panel out
21:15
there
21:15
right yeah that that board is designed
21:18
for
21:19
separating zoning with pumps right
21:22
thermostats and pumps yep thermostats
21:23
and pumps there's no valves there's
21:25
nothing extra in there and that one's
21:26
pretty simple really it is pretty simple
21:28
i mean we do have three different
21:30
transformer sizes depending
21:32
on what size boards you have you know
21:34
that comes in the three the four
21:36
or the six zone option but then we also
21:38
have a smaller single zone option for a
21:40
single pump switching really
21:41
yeah so we have the zsr 101 single zone
21:46
the zsr 103 three zone and zsr104
21:50
a four zone and a zsr 106
21:54
six zone correct yep and all three of
21:57
those will have different
21:58
well three and three of those will have
22:00
different transformer sizes
22:01
sure yeah so those transformers are
22:04
going to be soldered into the board
22:06
um they're not externally mounted and
22:08
plugged in like the zvr
22:10
series so uh those are soldered directly
22:12
onto the board but they still have that
22:14
resettable link
22:15
protection like like the other board has
22:18
right so if you have a quick little
22:19
short
22:20
it'll open up lights will go off it
22:23
basically go through and do the same
22:24
thing right isolate your thermostats off
22:27
that's the only low voltage
22:29
yeah cause that link is really only
22:31
protecting you on your low voltage side
22:33
right it's so it's gonna open up when
22:36
there's a low voltage short
22:38
and then from there you disconnect power
22:40
disconnect all your thermostats
22:42
repower it up if the green light comes
22:44
on you have power you know the board's
22:46
still okay so yeah so then you're gonna
22:48
go back
22:49
and plug in your thermostats
22:53
one at a time and see what happens right
22:56
now
22:56
yeah sooner or later you're going to
22:57
find that issue you are
23:00
and if one is giving you one in
23:02
particular has given you fits
23:04
then that is where you break out the
23:06
ohmmeter and start testing for
23:07
continuity
23:08
between your wires your thermostatic
23:11
wires and your thermostat wires
23:13
yep and most of the time we see a
23:15
problem on on three wire
23:17
not too often on on two wire but it it
23:19
could happen
23:20
you know if you got say the r or the w
23:22
wire
23:23
you notice the thermostat works fine
23:25
until you make a call for heat
23:27
and then all of a sudden the board goes
23:29
out chances are that short
23:31
might be in that w wire somewhere and
23:33
that could
23:34
i mean if you're not running a common to
23:36
your thermostat and you're only running
23:37
a two-wire
23:38
that could be a reason why your board's
23:40
not shutting off
23:42
yes if you haven't you have that wire
23:44
stripped inside the
23:45
the cabling you know that's giving you a
23:47
constant call for heat so if you get to
23:49
a point where
23:50
hey you know what i only have a two wire
23:52
thermostat
23:54
i don't even have the thermostat on the
23:55
wall i have the wire separated up at the
23:57
wall
23:57
and my board is continuing to call for
23:59
heat well that's a pretty good sign that
24:02
you know your wiring there's something
24:04
shorted in the
24:05
in the wiring yeah there it's scanned
24:08
apart and it's touching
24:09
the thing is that's not going to take
24:10
the board out it's not going to take
24:12
that resettable link out because it's
24:14
not as short
24:15
right it's just going to give you a
24:16
continuous call for heat
24:18
exactly and then when you get to the
24:20
high voltage side of that board we have
24:22
protection there as well
24:24
yeah in the in all the zsr boards
24:27
they all have a pump fuse that's
24:29
replaceable
24:30
right yep and we include a couple extra
24:33
fuses
24:33
with the board so you'll have a couple
24:35
extra in the cabinet sure
24:36
um but yeah fuse protection for each of
24:39
the pumps
24:40
and the system pump right and those are
24:42
good up to five amps
24:43
right yeah so that should cover any of
24:46
your
24:47
your modern pumps yeah i would say so
24:50
well greg i think we did a pretty good
24:51
job of covering both products series
24:53
and the troubleshooting side um so i'm
24:56
looking forward to coming back next week
24:57
what are we going to talk about
24:58
yeah so tune in next week to episode 10
25:01
and uh
25:03
basically we're going to go over what
25:04
you need to know about skull protection
25:06
yeah
25:06
go back to a plumbing topic i like that
25:08
sounds like a plan
25:10
great we'll see you guys next week see
25:11
you next week
25:14
thank you for tuning in if you ever need
25:16
help
25:17
please feel free to contact our tech
25:18
support team anytime
25:20
at techsupport.us caleffi.com
25:24
or call us during our business hours at
25:27
7
25:28
30 a.m to 4 30 p.m central time
25:32
at 414-238-2360
25:43
[Music]