Question about Honeywell Electronic Programmable Heat/Cool Thermostat - CT3300A100 Heater
Hi, I have a 1997 Rheem Criterion II gas furnace with an electronic thermostat. On the thermostat, I have the temp set to 70 "hold", so it's supposed to keep that temp at all times. The problem I am having is that sometimes more often than others, the furnace should kick on, but doesn't. When this happens, the temp in the house might go down to 65, but the furnace never kicks on. If I flip the fan switch from "auto" to "on", still nothing happens. The only way to make the furnace start its cycle is to either turn the furnace power switch on & off again, or to adjust my temp on the thermostat to 65 (making it supposedly click "off"), then back up to 70, making it click "on". This seems to always work. I also have to add that sometimes the furnace will not turn off. The temp in the house might get up to 75, still running. I turn it off by cycling the thermostat up to 75 and back down to 70 again. I'm baffled that cycling the power switch on the furnace or cycling the temp up & down on the thermostat both work to kick the furnace on. Sorry for such a long post, but I tried to include as much info as possible. Thanks for any help! Joss
Modern furnaces have many safety features that keep them from coming on. One likely cause is that the vauum hose to the flow inducer( the small motor that kicks on before the furnace lights) is clogged or kinked or filled with drainage water which will prevent the motor from ever coming on. The furnace will shut down until it is reset. Remove hose and check that is clear.
Posted on Nov 27, 2012
Joss sounds like the anticipator setting on thermostat i would replace it with a digital it will be more actturat . The furnace has to go over temp setting to turn off
Posted on Jan 18, 2009
I need help rplce thrmostat with a digital braueburn my furnance wont turn on no flashing lights cant reset the burner though has power what do i do shoul i reset the circut breaker that was never tripped though
Posted on Jan 26, 2009
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Posted on Jan 02, 2017
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