Question about Heating & Cooling
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Posted on Jan 02, 2017
Hi, Yes, you have the answer to you're problem. Now, I don't no if you have just a high limit, or a combination Limit control? I will go with the combination fan control as when they go bad, they stick in the closed position and they have normally open contacts. When the heat exchanger starts to heat on a call for heat, there is a dial on the fan control with temp. settings on it , and it will start to rotate as the heat gets higher. When it reaches its set fan on temp, it with start the fan.We no the fan works so the blower is good, so it shuts the burners down on you're high limit temp. which is factory set to about 250*F. When you turn The t-stat from auto to on in the fan side, that solves the problem temp, only. You will need to R & R the Fan control. If you need some direction on doing this please let me know and if it is a Honeywell auto/on type that is rectangular in looks, and if you remove the cover you will see the temp. dial with arrows on it. Thank you.
Best of Luck, and Sincerely,
Posted on Nov 21, 2009
All gas furnaces have a fan control of some sort. Either a mechanical fan control where there is a temperature probe that reaches into the heat exchanger compartment thru a hole in the panel that separates the control part of the furnace(this would be the front of the furnace where all the controls are) from the heat exchanger. This type of control is either a small black plastic control about 4 inches by 2 inches and about 1 1/2 inches thick secured to the panel with 2 screws. Or it is a slightly larger silver colored control that should have a pull off cover. It may say Honeywell on it. Either way the control will need replacing.
The other type of fan control is a solid state control board. This will most likely be located in the indoor fan compartment. It should be located under a covered control box. The box with all the wires going into it. This board will also need to be replaced if your furnace uses this type of fan control. You will need to bring your furnace model and serial number to a dealer that sells your brand of furnace or go online to a parts dealer that carries parts for your furnace. Hope I was of help to you! Good luck!
Posted on Nov 28, 2009
Probable causes include crack in heat exchanger, dirty pilot, bad high limit switch or bad gas valve. A crack can allow the fan to blow the flame off of the thermocouple or flame sensor. A dirty pilot will cause the same effect. The bad limit switch could cycle the system and a bad gas valve could be shutting off gas supply to unit.
Posted on Dec 03, 2009
SOURCE: main burner comes on and
There could be a couple of different things happening...
The most likely is that the high limit switch is bad and the flame causes it to bring on the blower and then shuts the flame down also...this could be because the high limit is bad or because the vent is blocked and the flue gases are not venting...
Could also be a bad/dirty flame sensor, but that is not as likely...
I would checkout the high limit and find out what is going on there...
Posted on Feb 02, 2011
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