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Heater stopped working after themostat install

Posted by Rob_in_LA (My Page) on
Tue, Oct 16, 12 at 16:11

I have a forced air heater that is connected to the boiler in my condominium building. I replaced the very old 1970's line voltage thermostat with a new programmable line voltage thermostat (Aube by Honeywell TH106/U). There were only 2 wires to connect. Once I connected it and turned the heat up to activate it, I heard a popping noise from the motor area. Now if I try to turn it on, I hear the fan cycle up for about a second, then cycle down. The thermostat displays "LP", which in the users guide says:

The thermal circuit breaker in the heater is opened. This can happen if the heater is obstructed by furniture or curtain and has overheated, or if the thermal circuit breaker is defective.

I'm wondering if I somehow blew a fuse in the motor area. The only thing that looks like I fuse is the box in the attached picture. Any ideas of what this might be and how to fix it?


Follow-Up Postings:

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RE: Heater stopped working after themostat install

The object in the picture is a capacitor. It neither a fuse box or circuit breaker.

Usually a circuit breaker will have a reset button. See if there is a button which can be pushed.


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RE: Heater stopped working after themostat install

I don't see a push button anywhere. The heater is from the 1970's as well, so it may predate circuit breakers. (I tried resetting all the circuit breakers in the home panel.)


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RE: Heater stopped working after themostat install

I'm still stuck with this problem. I reinstalled the original thermostat (see picture), but really want a programmable. There are 2 wires going into the thermostat, and I only measure 0.04 volts across them. This is controlling a blower that blows air over a heat exchanger (hot pipes from the condos boilers). I'm not sure what programmable thermostat will work. Does anyone have any advice?


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