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Heater in bedroom will not work unless thermostat and heat is on in bathroom

Heater in bedroom will not work unless thermostat and heat is on in bathroom

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  #1  
Old 12-15-13, 07:36 PM
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Heater in bedroom will not work unless thermostat and heat is on in bathroom

I bought my house a year and half ago. After being there for six months I noticed the baseboard heater in the spare bedroom was not working. I figured it was the thermostat so I switched it out with another one, it still did not work. The heat would come on and off every now and then. I bought another heater and replaced the older one. It did not work. When I was about to give up, the heater came on and I almost burnt my hand. I thought I had it fixed. I screwed the heater to the wall, turned the thermostat back on and it was not working. I started to think. I went to the bathroom and turned up the thermostat, and then checked the heater in the bedroom. It was on. I turned off the thermostat in the bedroom and the heater shut off. The heater in the bedroom will only work when the thermostat is turned on in the room and the bathroom and the heat has cut in, in the bathroom. Can someone please help?
 
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Old 12-15-13, 08:50 PM
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That will be an extremely hard problem for us to help you with compounded by the fact it's 240volts.

If I had to make a guess..... I'd say the power from the panel goes to the thermostat in the bathroom and to the bedroom thermostat as well. There was a wrong connection made in the bathroom.

That would mean you will probably find three 12-2 cables in the bathroom thermostat and two 12-2 cables in the bedroom thermostat.
You'll need to turn the breaker off and confirm what I've suggested.
You are going to need a VOM (volt-ohmmeter) to diagnose the wiring.
 
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Old 02-08-14, 10:09 AM
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@PJmax, You are right about the 3 12-2 cables wires in the bathroom and the 2 12-2 wires in the bedroom. How would I figure out which wires to connect in the bathroom to the thermostat?
 
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Old 02-08-14, 12:09 PM
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You have three cable in the bathroom......

One is the 240v feed in.
One is the 240v feed to the next room.
One is the line to the bathroom heater.

Do you have a volt/ohmmeter ? Set it to AC volts over 240VAC.

Turn breaker off.
Open all the connections and leave them hanging out.
Turn on breaker and check for the cable that is 240vac. Mark it.
Turn breaker back off.
Temporarily connect the 240v feed to either of the two remaining cables and turn breaker back on.
Make sure thermostat is on in the bedroom..... which heater is getting warm ?
Mark that cable and turn power back off. Now you know what all three cables are for.
You will need to connect the incoming 240v line and the bedroom line together. When making this connection it might be easier to leave a white and black tail out to connect to the thermostat unless the thermostat has a place for double conductors.

These two tails go to AC in or L1-L2 on the thermostat.
The remaining cable, which is the bathroom heater, connects to T1-T2 on the thermostat.
 
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Old 02-14-14, 11:50 AM
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Thanks so much. It is now working correctly.
 
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Old 02-15-14, 02:14 AM
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A little tricky there with wiring..... Excellent job
 
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