Question about Carrier XHB123D X/Y Series Heat/Cool Air Conditioner

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Gas furnace continually running

My furnace runs for about a minute and turns off with a rumble and then starts immedietly right back up. I see it ignite but I do not feel warm air coming out of the vents. My thermostat is set to 69 degrees and it is currently at 67.

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Yes blower is running and new filter

Posted on Feb 28, 2015

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Is the blower operating and are your air filters new

Posted on Jan 04, 2009

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Furnace starts and ignites and fan comes on but when thermostat is turned off the gas shuts off and flame off but furnace continues to run. whu?? any suggestions?


The fan normally runs for a few minutes or so after the gas shuts off.

This removes the heat from the furnace and transfers it into the living space instead of just letting it possibly cause overheating of the furnace until it dissipates. If it is a fan that blows outside, that fan also needs to run for a few minutes to clear exhaust gasses from the furnace - to keep them from dissipating into your home.

Sep 28, 2015 | Air Conditioners

2 Answers

The 2 flashes on the screen and the furnace will not turn on. The 2 indicates the time frame program which is correct but why flashing? Owners manual does not address.


I had two flashes on a Honeywell 8670 continuous retry controller to my Burnham power vent natural gas furnace.In my furnace the two flashes meant the last attempt at starting failed and it was going to retry in 90 seconds.

In my case the furnace actually had two intermittent problems with similar codes. The first issue was the high voltage pilot light cable was also a combination flame sensor wire. The cable was supposed to clamp on to the pilot assembly like a spark plug wire.

When it was installed the clamping bits were too far apart and some fool decided since it wasn't sticking he would glue it on. This worked initially, but later the connection was only good enough to pass the high voltage not the low current DC signal back to the controller indicating the flame started successfully. Flames conduct a small amount of electricity due to ionization and the controller senses this.

I pinched the clamping bits together with some pliers. Then it fit tight and kept working.

Other reasons for the 2 flash code on my controller might be no gas or pilot light failure.

My other problem was a partially failed capacitor on my power vent motor caused the vent fan to run in reverse on say one in one hundred start attempts. Once it started running in reverse it wouldn't run forward without stopping it completely, which took several minutes of off time. The capacitor was available quickly and inexpensively from McMaster Carr.

Jan 10, 2015 | Air Conditioners

1 Answer

We have a Coleman Electric Furnace Serial # AOL6042086, Model # AHP36C3XH21A and the fan runs constantly, will not shut off. We have replaced the thermostat and just replaced the control board. We h


I wish I was a furnace expert but I will give a push in the right direction. When a gas/electric fan runs it has two speeds. When you turn on the FAN ON switch it should run at the slower speed. If it doesn't turn on or turn off again when you turn it back you have a wiring problem or a thermostat problem. Make sure the thermostat is compatible with your unit and wired properly (on both ends). The other time the fan runs is "in session" when heat or cooling is applied to the system. It should run until the system finishes the cycle then a bit more (30 seconds or 1 minute) to blow the treated air completely through the ducts. If it doesn't stop then you may have a bad fan time delay or relay. Check parts for your model and various appliance repair site online.

Nov 25, 2014 | Coleman Mobile Modular Home Electric...

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Ruud 90+ Model UGRA 10EZAJS Trips Out


Check for condensation buildup in the Induction Blower housing. The condensate tubes or canister may be blocked and causing the diaphragm switch to trip the unit out causing the burners to shut down.

Feb 11, 2012 | Ruud Air Conditioners

1 Answer

Model rgdg-100auer 100,000 btu with pilot light. i light the polit that is fine turn on gas that is ok runs for 1 minute then shut all gas off and i have to relight the pilot time after time but never...


If this happens each time the blower starts, you have a crack in the heat exchanger and need to replace furnace. If the blower is not starting, it could be a high limit opening up because of the heat being generated. By pass the high limit circuit to see if it stays on and the blower works. This is only a test procedure, do not continue to run system like this. If you have a manual fan switch, turn it on and then start the heater.

Feb 23, 2011 | Air Conditioners

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Hello, I have a Amana Air Command 80 model #GHI90A50, 22 years old. This furnace is on its third ingnition module (last one two yeras ago). The symptom I am trying to diagnose has been ongioing since this...


If your furnace lights and the gas stays on for 8 to 10 seconds, then shuts right back off, then you need to clean your flame sensor with light sand paper or steel wool. You might need a new flame sensor, but most of the time they can be cleaned an will work well after cleaning.

Dec 05, 2010 | Air Conditioners

1 Answer

Rheem 3204-80D furance. Turns on and fan starts. Then in about a minute the fan shuts off.


Problem: Your furnace will not ignite the gas to produce heat for your home. When a furnace has a bad ignitor what I see most of the time is the following sequence of operation:


1. Thermostat calls for heat. 2. Draft inducer motor starts. 3. Pressure switch attached by a small plastic or rubber tube senses the negative pressure produced by the draft inducer and closes. 4. Draft inducer runs for 30 seconds to a minute before you hear a gas hissing sound. The ignitor did not glow, the flame sensor (a small metal probe about 1/8" in diameter, with a white porcelain base) does not sense the flame, so after 8 to 10 seconds the hissing sounds stops with no ignition of gas to heat your home. Your furnace shuts down and goes into a lock out condition until you turn your power switch back off and on again. Then the sequence starts all over again with no ignition of the gas. Solution: You probably need to purchase and install a new ignitor. I would suggest that you inspect your ignitor closely for cracks. Make sure you do not touch the ignitor with your bare hands. If you do not visually see a crack, then you could have a furnace control board problem or a limit, rollout switch problem. The furnace's control board might not be supplying the voltage to the ignitor. If your furnace lights and the gas stays on for 8 to 10 seconds, then shuts right back off, then you need to clean your flame sensor with light sand paper or steel wool. You might need a new flame sensor, but most of the time they can be cleaned an will work well after cleaning.

Nov 26, 2010 | Air Conditioners

1 Answer

Intertherm propane furnace makes popping sound when running


It sounds like you have a possible hole in the heat exchanger. Turn the heat off and turn the fan on. If you feel any air coming back out of the heat exchanger, you have a hole. A yellow flame is not a good sign. I would even consider having a service professional come out and take a look.

Apr 05, 2009 | Intertherm P3RA-048K Air Conditioner

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