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A/c runs and cools but will not shut off also furnace willnot startup thanks barney

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Check for faulty thermostat

Posted on Nov 16, 2008

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This is a propane furnace that continues to run even after being shut off and plenum cools. No chimmey just pvc pipe to exhaust outside. Does that help.


The fact that the plenum cools down suggests that the thermostat is satisfying its setpoint and correctly turning off the gas flow....but....if the blower is continuing to run after the plenum cools down, it indicates the blower relay on the control board is stuck in the closed position (if it is a newer style furnace) OR the "fan' portion of the 'fan-limit' control is stuck closed if it is an older furnace.

If it is a newer one with a circuit board, the board cannot be field serviced...it must be replaced. Some furnace nmanufacturers have a secondary board that controls the fan alone and is cheaper than the furnaces with the single 'control board' that performs all functions of the heating/blower sequence.

Unless you have a fair amount of understanding of electricity, you should at this point call a service company for service.

Sep 29, 2015 | Air Conditioners

1 Answer

The line is frozen and the fan will not shut off. How do I turn the fan off?


Shut off the electric to your furnace.

the reason that the line is frozen is because of one two things:
First there is enough air passing over the A coil on your furnace.
Could be dirty filters - closed vents- furnace fan will not run/ stops and starts (bad motor).
Second the charge on your a/c unit is low.

John

Jun 24, 2014 | Carrier XHB123D X/Y Series Heat/Cool Air...

1 Answer

Model DGAA070BDT SER# 0112o6717 Colman Mobil home furnace My furnace makes a internal thump when it's in the cool down cycle after the burner shuts down and only the fan is running before the furnace...


Coleman is known for this. I have seen many over the years make this noise during cool down. The heat exchanger is contracting and expanding. The heat exchanger is the part that the fire burns in. It surrounds the flame, and when the furnace is on, the metal they use for many of their furnaces has a tendency to make noise as it cools off.
One other thing, if you don't already have one, it would be good for you to buy a carbon monoxide detector and put it in the mobile home somewhere up high hopefully in the hallway close to the furnace return air. If the heat ex. is expanding as is sounds, it would be good to make sure it does not have a crack in it , in turn releasing dangerous fumes. Hope this helps.

Apr 18, 2011 | Air Conditioners

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Furnace is 7 years old. Will not stay running for more than 5 min. Will start up again after shutting off and then run for another 5 min. Suggestions?


Check the air filter. Jump out thermostat to see if it stays running longer, if so replace thermostat. Make sure all return air ducts are clear of debris. If furnace has a Fan/Limit switch, make sure tabs are set at 100, 140 and 200. Sounds like something may be heating up and shutting unit off till it cools back down.

Jan 03, 2011 | Ruud Air Conditioners

2 Answers

Flame sensor dirty


Sandpaper lightly scrubbed over the sensor tip to remove any contamination.

Sometimes cleaning is not enough and the sensor must be replaced.

Jan 30, 2010 | Carrier XHB123D X/Y Series Heat/Cool Air...

1 Answer

Furnace runs OK, but blower runs again a few seconds later


Could be a defective thermostat in the plenum.
When a gas furnace shuts down the fan(blower) will run until the plenum cools to the safe range. Usually 1 and 1/2 minutes.
Intermittent operation is a defective thermostat or relay.

Mar 11, 2009 | Carrier Air Conditioners

1 Answer

Furnace runs but won't ignite.


Error code 12 is blower on after power up. Meaning: after you turn on power to the furnace for aprox. 60-90 seconds the blower will run. The blower should then shut down and the furnace should go through the start up process, providing that the thermostat is set for and calling for heat. If the furnace fails to start after blower shut down there should be a new fault/error code. However if the blower continues to run longer then 90 seconds and continues with the same fault code more then likely the circuit board is bad. Please let me know if this was helpful and give me a rating. Good luck.

Feb 08, 2009 | Carrier XHB123D X/Y Series Heat/Cool Air...

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