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Furnace will not turn on in Auto mode thermostat

My furnace will not turn on while the thermostat is in Auto fan mode. I replaced the sequencer in the furnace and still have the same problem. The furnace will operate properly while in ''ON'' mode.

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  • 37 Answers

It sounds like you T-Stat is messed up. Look in your manual to see if there is set up instructions. If not I would change the T-Stat.

Posted on Jan 03, 2009

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I disconnected all the wires to the thermostat and the fan still keeps running.


The problem is with the contacts in the fan relay, not with the thermostat. If it is an older furnace, the relay should be an individual component and is replaceable. If it is a newer furnace, the fan relay will be incorporated into the control board and cannot be replaced. Both of those answers above pertain if the furnace is a natural gas or LP furnace.

If it is an electric furnace, the first stage sequencer could be stuck closed because typically the first stage heat brings on the fan.

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My blower on my carrier furnace unit won't turn off? a/c or heater doen't turn on.


gas furnace??? check the start capacitor, put unit in ac mode and see if fan comes on(switch fan to on at thermostat) if it does not a fan problem or capacitor problem. when in cooling mode thermostat controls fan, when in heating mode, furnace controls fan

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Amana Air Command 80 with fan mode is on, the furnace is running and blowing heat. Why the furnace did not do any thing when I set it on auto mode? Then I replaced a new thermostat, but nothing change


Try setting the temperature higher. It could be that the room temperature is not getting cold enough for the automatic controls to activate the heater.

Nov 02, 2014 | Air Conditioners

1 Answer

My central electric furnace eb15b heats up up but the blowers not turning on?


Most likely it is the sequencer that is bad. Try turning the fan on with the thermostat. If it runs in "on" and not in "auto", most likely it is a bad sequencer.

Mar 14, 2014 | Air Conditioners

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Nortron electric furnace series


Sounds like a stuck sequencer. Verify there is not 24 Volt control voltage to sequencer coil, then replace sequencer.

Jan 04, 2014 | Air Conditioners

1 Answer

The heat come on turn off but fan will not shout off.


if you have a gas or oil furnace then the limit control is probably bad. If you have electric heat or a heat pump then the sequencer is probably bad. But first make sure the thermostat is not set to "FAN". The thermostat must be set to "AUTO". Many systems have a time delay on the fan to capture the remaining heat after it completes a heating cycle. Usually several minutes.

Feb 17, 2011 | Air Conditioners

2 Answers

My furance is running and will not turn off the air-condition was on but now will not run but the furnace is still running but but does not turn off at themastatic can you tell me what to do for this...


I suspect the sequencer is stuck. However, you may have a thermostat problem or a short in the 24V. If it is a heat pump then likely the reversing valve is not kicking in. There can be numerous causes for this and you should probably call a pro in for this one. Diagnosis is not such a simple thing.

Jun 29, 2010 | Goodman CLQ36AR49 Air Conditioner

2 Answers

Fan will come on for heat(auto), but not for AC or set to ON


You have a blower relay in the furnace that's probably bad. In the heat mode the blower is on a temperature relay, in cooling mode the blower has to come on immediately so there is another relay for cooling. The green wire on the thermostat feeds that relay, so if you go to the furnace and shut the power off and find the green wire from the thermostat that feeds that relay and replace it, being careful to mark all the wires before removing them, also the relay terminals have numbers for identification.

Apr 07, 2009 | Air Conditioners

1 Answer

Sometimes the furnace doesn't come on when it should


OK so its an all electric furnace no gas? I cant think of anything clicking on an electric furnace except the sequencers or the safety switches.

If this is whats your hearing then the fan should definitely be running.

Feel carefully around the fan motor (I assume this is in a mobile home). See if you detect any heat coming around the blower area close to the fan motor. If so the fan motor may be at fault or one sequencer may be out (the main one of course...) the thing is can you get the fan to come on by turning the auto switch on the thermostat (or if older model the Auto On switch on the furnace) to ON? If so you can "limp by and have heat til someone either checks it or you can go on deeper into it. but to go deeper you'll have to let me know you know where the elements are and that you have a volt meter. and feel comfortable using it especially on HOT wires.

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1 Answer

Bad sequencer or fan relay?


does ANYTHING come on when set to heat?

Feb 28, 2009 | Air Conditioners

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