Check the voltage coming off the thermopile it should be 600mille volts .
SOURCE: cozy one sided wall furnace (no blower motor)
This is a weird one, but make sure all the wire connections are in the correct place. I accidentally miss wired a heater like this and it did the same thing.
SOURCE: New honeywell thermostat on new gas furnace not working
sometimes there's a differential setting anywhere from 1-3 degrees, see if you can make sure it's down to 1
SOURCE: I have model#2509622 Williams wall
can you manually fire the unit w/o the thermostat by shorting 2 of the 3 wires, there may be more wires than that, but you should be able to fire it on 2 to 3 wires alone let me know it sounds like something is floating voltage wise on the unit
SOURCE: Replaced mercury thermostat w/Honeywell CT87K - doesn't work!
You need a specific thermostat for a Wall Furnace it is a Millivolt Thermostat and not a 24v standard thermostat....usually it will work anyway however if the powerpile (generator produces millivolts from the pilot light) is weak it may not be producing enough...or the Pilot light may be dirty and lazy...won't produce enough millivolts ...or you can have bad or dirty contacts or connections....or a combination of any of the above.....a 24v Thermostat and particularly a non-mercury thermostat has too much resistance in it for a millivolt system....as your Wall Furnace (other than the fan) runs on less than 1 volt
SOURCE: Honeywell dial theromostat.
you need to check the furnace itself for , locate the 24 volt ac transformer inside the unit and see if it is fused some are some not , check to see if you have 120 volt ac in from the source and 24 volt ac out , sounds to me as if you have lost the 24 volts ac which powers the thermostat as well as the furnace pay close attention as to how you remove the wires and make a diagram and you should be able to replace it yourself , once you get it uot goto a heating supply place in your area and let them match it up and this should be a fix ya
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This is Henry Samek. I did some research and found a Honeywell thermostat model# CT 53K that accepts 250 to 750 millivolts and ordered it. There is no fan on this system. The 600 millivolts answer is likely correct but you need a thermostat that is compatible and the Honewell model# T87K1007 is not millivolts compatible. Since there is no transformer and only a thermopile that produces millivolts, then the Honeywell model# CT 53 thermostat 2 wire hopefully will be the answer for this Homart gas furnace with a Mueler Climatrol system. I will let you know. Thank you for your help!
This is Henry again. I installed the Honeywell CT 53K thermostat for the Homart gas fired furnace with a Mueler Climatrol thermopile and it works beautifully on millivolts produced by the thermopile. So, if you ever need to need a compatible thermostat for millivolts produced by a thermopile the Honeywell CT 53K with a range from 250 to 750 millivolts is the one to use!
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