This gas furnace runs OK some of the time, but will not ignite sometimes unless I switch the thermostat off and on again (2nd thermostat-both problems). May run for days and recycle properly, then quit again.
1. check indoor unit wiring.
2 check sensar of thermostate.
3if not change thermostate
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1. unit is 5 yr old and wiring has not changed, all connections tight
2. thermostat sensing seems appropriate
3. this is the third thermostat, have tried standard mercury switch as well as digital ,with the same results. These last two replaced both this winter.
Comment- something is happening WITHIN the furnace control beyond the thermostat, and is intermittant. Works most of the time, then does not reignite. When the furnace fails to ignite, the exhaust fan runs continuously and has already been replaced. Turning the thermostat off and on recycles the furnace and works well.
I have a Carrier Weathermaker 9300 TS and it does exactly the same thing!
I have had 3 seperate repair companies look at it, clean the sensor, adjust stuff, etc. and they are basically suggesting I replace the furnace all together!! It is only 5 years old, but apparantly this is a real problem with these furnaces.
In order to get mine starting, I have to turn it off at the main switch and then on again. This works only some of the time.
Every couple of days the furnace won't ignite. The new electronic thermostat is flashing for it to start, but it won't until the temperature in the house drops to about 5 degrees C below the setting or if I reset it. Once it starts it will be fine for a couple of days and then do it again. This is getting very frustrating. Any solutions??
I have a Bryant Plus 90 furnace. (15 yrs old) Every couple of days the furnace will not start. I need to turn the power switch off and then back on. The furnace then starts up. It happened a couple of times last winter, I replaced the air filter, SPACEGUARD, and had no further problems. The same problem began a couple of weeks ago, I changed the filter again but every couple of days the furnace will not start. The repair man was here for an hour and could not determine the cause. The thermostat will say "HEAT ON" but furnace is not running. HELP!
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