Heater not starting as before
Posted 22 September 2006 - 08:51 AM
Posted 23 September 2006 - 05:00 AM
Posted 23 September 2006 - 07:30 AM
It sounds like ur fan limit switch has gone bad. Depending on the age of the furnace and make, most older furnaces had a fan limit switch which would allow the furnace to heat up 1st and then allow the fan to run. This would stop cold, luke warm air from being blown into the house. Its secondary purpose was to continue to run the fan after the gas had shut off to cool down the heat exchanger.
In the newer furnaces they've done away with this temperature switch and now its just a timed program contained in the logic board.
U will need to take the cover off the furnace to get to the control section and also to expose the gas train (manifold). U are looking for a approx 4" x 4" box. Normally has a silver cover with "Honeywell" stamped on it. May have a red knob sticking out of it. Thats the limit switch.
Some manufactuers have moved away from the big Honeywell control and gone to 2 smaller, cheaper thermostats to do the job of this control.
Please supply the make, model & serial number and approx age of UR unit. You'll find the M & S number on the units nameplate. That would help alot.
Posted 25 September 2006 - 05:18 PM
As I understand, the blower comes on immediately with a call for heat, and stays off when there is no call.
"The answer is that.......wait...what was the question again?"
Posted 01 October 2006 - 02:14 PM
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