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ApplianceGuru.com: The Samurai Appliance Repair Forums > Do-It-Yourself Appliance Repair Help > Heating, Ventilation, and Air Conditioning (HVAC) > new thermostat, now no heat. |
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ApplianceGuru.com: The Samurai Appliance Repair Forums > Do-It-Yourself Appliance Repair Help > Heating, Ventilation, and Air Conditioning (HVAC) > new thermostat, now no heat. |
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| Moderated by: RegUS_PatOff, Pegi, hvacdrd, applianceman18007260692 |
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| new thermostat, now no heat. | Rate Topic |
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| Posted: Wed Nov 4th, 2009 02:20 am |
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1st Post |
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Wip Senior Apprentice Appliantologist
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Installed a setback thermostat (robertshaw) on a Nordyne high efficiency gas furnace. set it to heat and the induced draft fan starts, runs for about 30 sec then kicks off for a couple of seconds and starts again. This could go on all night apparently. To make a long story short if I jumper from R to W the furnace works properly. Seems the thermostat has some resistance to it. I didn't have my meter to check this but I can't imagine anything else causing this to happen.  I plan to add a small relay, have the thermostat pick it up and use contacts from the relay to start the furnace. Strange, though. Anybody run into this kind of thiing?
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| Posted: Wed Nov 4th, 2009 04:20 am |
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2nd Post |
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RegUS_PatOff Fellow, Academy of Sublime Masters of Appliantology 
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Thermostat model number ? Furnace model number ?
____________________ RegUS_PatOff http://www.youtube.com/watch?v=oPAY2LsKVEw my video production: “Easter Seals Walk With Me” (also in HQ) http://www.youtube.com/watch?v=-EBiLyYXMiA Upon leaving this Earth "Do you want the Smoking or Non-Smoking section ?" |
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| Posted: Wed Nov 4th, 2009 11:03 pm |
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3rd Post |
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ACtechGUY Master Appliantologist 
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Many furnace control boards have problems with electronic thermostats that switch the control signal electronicly vs. an onboard relay. I have not seen that problem for years , most thermostats these days do have relays due to the above problems. Also problems occur with "power robbing" thermostats and furnace control boards . If this stat does not use batteries and does not have a 24v common wire It needs resistors installed at furnace to allow it to work properly . Your relay idea WILL solve the problem though. Last edited on Wed Nov 4th, 2009 11:06 pm by ACtechGUY ____________________ Once you let the smoke out of a part, you can never put it back in!!! |
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| Posted: Wed Nov 4th, 2009 11:37 pm |
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4th Post |
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Wip Senior Apprentice Appliantologist
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 I put the relay in and it works now. It was a Robertshaw Digital Model 300-252 that I got on ebay. It has a battery in it. I knew the relay would make it work but just wondered if anyone else had run into this problem.
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| ApplianceGuru.com: The Samurai Appliance Repair Forums > Do-It-Yourself Appliance Repair Help > Heating, Ventilation, and Air Conditioning (HVAC) > new thermostat, now no heat. | Top |
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