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Old 02-03-2010, 08:39 PM   #1
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Electric baseboard problems


I purchased a house in May and didn't use the heat until
recently when I noticed a problem with the baseboard in
the master bedroom. When the thermostat was turned on
regardless of what it was set to the heat wouldn't shut off
when it reached the desired temp so I replaced the thermostat.

The new thermostat seemed to work for a week or so but now
I'm having a new problem. The heat does shut off when it reaches
the desired temp but it won't turn back on when the room cools
unless it is turned off then back on.

I checked the wiring for shorts and all seems fine. The
thermostat is a Honeywell CT410B and the baseboard
is Farenheat brand(don't have the model # in front of me).
One leg of the circuit is direct to the baseboard and the other
leg connects to the thermostat. The thermostat is 2 pole so
I was thinking about rewiring but wasn't sure if it was an issue
with the baseboard or what. Any help is greatly appreciated and thanks in advance.

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Old 02-04-2010, 03:52 AM   #2
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Electric baseboard problems


HOW did you wire-up that 2 pole thermostat?

When using a 2 pole thermostat as a single pole unit, you have to connect the poles in series (not in parallel) in order for it to work properly. Since only one pole of the thermostat breaks during normal operation, if it was wired in parallel it would behave as you have described.

Rewire it with both poles in series and it should work fine.

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Old 02-04-2010, 11:40 AM   #3
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Electric baseboard problems


I wired it the same way the old one was. Which is the white wires
from the feed and heater are nutted together and the black
feed wire is to the top of thermostat and the heater wire to bottom of
it.

The reason I came here before changing the wiring is because I checked
the wiring of the thermostat in the other room and its wired the same
way. If you feel wiring the thermostat for 2 pole then ill give that a shot.

Thanks for the reply.
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Old 02-04-2010, 04:43 PM   #4
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Electric baseboard problems


Quote:
Originally Posted by shnevdorf View Post
IWhen the thermostat was turned on
regardless of what it was set to the heat wouldn't shut off
when it reached the desired temp .
Did it eventually shut off by itself?

Quote:
Originally Posted by shnevdorf View Post
The new thermostat ... I'm having a new problem. The heat does shut off when it reaches
the desired temp but it won't turn back on when the room cools
unless it is turned off then back on. .
Would it eventually turn back on if you did not touch it?

Looks to me to be a large temperature span between when it shuts off (temperature high enough) and when it turns on (temperature low enough). This may be inherent to that make and model, or may vary from one to another even of the same make and model. Depending on how it happened to be calibrated, you could have either problem #1 or problem #2.

Also some thermostats may change their behavior after being put into the off position a few times. This may deform the temperature sensitive element inside on some models.
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Old 02-04-2010, 05:04 PM   #5
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Electric baseboard problems


Quote:
Originally Posted by AllanJ View Post
Did it eventually shut off by itself?
It would never shut off. The first night I used it I woke up sweating
because it was about 85 degrees in there since it never shut off.

Quote:
Originally Posted by AllanJ View Post
Would it eventually turn back on if you did not touch it?
It wouldn't turn back on. Had the opposite issue from above when I
woke in the morning freezing because it had been off most of the night.
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Old 02-04-2010, 06:05 PM   #6
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Electric baseboard problems


Based on the installation manual and the product brochure for the T410B t-stat, the L1 and T1 connections contain the thermally activated control.

If you truly have a 240vac circuit, you should be able to hook up your white leads to the second set of wires with no change in the operation of the heater except that you now have positive break of both conductors when the tstat is turned full OFF (safer).

So, your incoming power will be on L1 and L2, and your wires to the heater would be on T1 and T2.


If your heater still misbehaves, it's possible your new tstat is damaged (can occur during installation). Get a new one, and measure your voltage on the incoming power while you have the wires disconnected and separated (turning the breaker off first while you work, of course...).

NOTE: I have seen tstats miswired because the previous installer got the power supply from another tstat or heater, but miswired the other (first) box by tapping in to the load side of the first tstat. That would make the second one dependent on BOTH tstats calling for heat before it turns ON, but EITHER tstat will shut it OFF. Just something to look for...if you find that, you need to correct it.
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Old 02-04-2010, 07:55 PM   #7
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Electric baseboard problems


Quote:
Originally Posted by williswires View Post
If you truly have a 240vac circuit, you should be able to hook up your white leads to the second set of wires with no change in the operation of the heater except that you now have positive break of both conductors when the tstat is turned full OFF (safer).

So, your incoming power will be on L1 and L2, and your wires to the heater would be on T1 and T2.
Just to make sure I understand this correctly are you saying that wiring it this way shouldn't make a difference in functionality but it is a safer way of wiring it?

Quote:
Originally Posted by williswires View Post
I have seen tstats miswired because the previous installer got the power supply from another tstat or heater, but miswired the other (first) box by tapping in to the load side of the first tstat. That would make the second one dependent on BOTH tstats calling for heat before it turns ON, but EITHER tstat will shut it OFF. Just something to look for...if you find that, you need to correct it.
I haven't traced the circuit completely so I suppose that could be possible but I don't think it is likely since this feed also feeds the other bedroom which functions correctly.


Also, I'd like to thank williswires, allanj, & kbsparky for helping out. It is truly appreciated.
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Old 02-04-2010, 08:03 PM   #8
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Electric baseboard problems


Also have one more question... Is it possible something in the baseboard itself is causing the problem or if that was the case would it not function at all?
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Old 02-04-2010, 09:35 PM   #9
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Electric baseboard problems


Quote:
Originally Posted by shnevdorf View Post
Just to make sure I understand this correctly are you saying that wiring it this way shouldn't make a difference in functionality but it is a safer way of wiring it?
yep


Quote:
I haven't traced the circuit completely so I suppose that could be possible but I don't think it is likely since this feed also feeds the other bedroom which functions correctly.
Does the circuit wiring go to the other room first? You can rule this out by reading the voltage on the two supply wires in your problem room, while switching the other room's tstat on and off. If your problem room's voltage changes with it, there's your problem.

In any case, you need to confirm that you do indeed have 240v coming to the tstat you are having problems with. You also should hear the tstat click as you turn it up and down past the setpoint.
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Old 02-04-2010, 09:53 PM   #10
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Quote:
Originally Posted by williswires View Post
Does the circuit wiring go to the other room first?

In any case, you need to confirm that you do indeed have 240v coming to the tstat you are having problems with. You also should hear the tstat click as you turn it up and down past the setpoint.
No it does not. The j-box the tstat is in has 3 romex lines coming in. First is the feed, second is the line to other room, and third would be heater. The feed and the other room line are connected to each other before tstat.

I do have 240 to tstat and it does click when passing the set point.

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