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Fan does not come on but I can hear the furnace come on.

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Re: Fan does not come on but I can hear the furnace come on. - Goodman GMS90703BXA Heater Heaters

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Posted on Nov 26, 2007

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Fan will stop running?

What To Do When Your Furnace Won't Shut Off
Dec 13, 2013 - Sometimes a furnace blower will not turn off because there is a mechanical or ... If the furnace continues to run, shut the heating system down.
FAQ: Our Answers to Your Questions ' you will find a comprehensive frequently asked question list that we compiled ...Why does my heater's fan continue to run even after the set temperature is ...Furnace fan won't stop running after the heating cycle is > HVACMy furnace fan won't stop running after the heating cycle is done. The only way to shut it ... Tim H. is online now. A new question is answered every 9 seconds ... If itdoes have the Honeywell fan-limit control, then replace. Ask Your Own HVAC ...Frequently Asked Heater Questions - CaptiveAire

Dec 17, 2015 | Heaters

1 Answer

My furnace wont turn off

Well Linda, is it the heat portion will not shut off or just the fan in the furnace that continues to run?? If the heat won't shut off, it will get uncomfortably HOT in your house, if its just the fan.....well, its just the fan.

More than likely its just the fan and it is running continually due to a stuck set of contacts in the control board or in the fan control board, if so equipped. If it is a furnace that is older than 15 to 20 years, it could be a mechanical relay that controls the fan directly off another control in the furnace vestibule that senses heat in the heat exchanger. If its an electric furnace, the first stage heat sequencer could be stuck closed causing continual fan operation and possibly one heat element is also energized. There are also several additional issues that could be the cause.

At any rate, its time to contact a reputable service entity to correct your problem. Good luck, Linda.

Dec 04, 2015 | Heaters

1 Answer

Why does furnace fan run continuously?

No on the thermosat go and check fan is not on the summer switch setting , if the fan is running it could be the AFC automatic fan control not shutting the fan off

Dec 29, 2012 | Honeywell Heaters

1 Answer

For some reason the heater does not generate heat. the fan works but no heat. Any Ideas?

I've got an easy way for you to check, and then we can help you from there.
First pop open both lids to your furnace (this may require a screwdriver). Turn up your thermostat, push the safety interlock button in if it has one (it's a button that turns off the power when the doors are removed), and watch.

On most modern furnaces (past 20-25 years) you'll hear/see:
1. Inducer fan
2. orange glow (ignitor)
3. Gas valve opening and ignition (flames)
4. Main Fan.

that's normal heater operation.
The most common issue here is a burned out ignitor, in which case you wouldn't see the orange glow but the sequence would attempt to continue anyway (the gas valve will open and hiss gas, but it won't lite, then it'll give up and try again a few minutes later).

On older furnaces there's a pilot light to start with, the click of the gas valve and boom... ignition.

On new furnaces it's
Inducer fan
gas valve opening
spark - ignition
Main fan.

and there are some oddballs in between, particularly the Lennox Pulse. If that's your furnace just back away slowly and call a professional... some guys won't even touch those, so be sure to mention what it is... if you call a pro.

So go ahead and watch it run, then tell me/us what you see.

May 06, 2011 | Bionaire Heaters

1 Answer

Can hear furnace on but fan will not engage. I

This is probably the fan limit that is bad. It should be a black bow tie looking thing next to or near the blower.

Dec 09, 2009 | Coleman Propane Forced Air Heater...

1 Answer

Main blower stays on, burner fan on intermitantly,

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!

Nov 28, 2009 | Heaters

1 Answer

The furnace send signal to the fan in about 30 seconds, now this fan is set in auto from my termostat, my problem is the fan is starting slowly and some time it don't start, but if I use the option manual...

Depending on the model of the furnace, the blower is either a 2 or 3 speed. When the furnace operates in heating mode with the thermostat in the auto position, the furnace starts the fan when the furnace reaches a specific temperature or after a set time delay, but it operates the fan in low or med low speed on heat mode, when you put the thermostat fan switch in the "ON" position, the furnace operates the fan in "HI" speed, the same speed used for cooling mode. You may have a blower moter that is starting to short. I would recommend having a professional replace the motor before now before it becomes an emergency in the middle of the night during a cold spell.

Oct 10, 2009 | Heaters

1 Answer

Fan continues to run after heating

That's the fan switch. It's a thermostat that controls the fan coming on and off, it's probably failed and needs to be replaced. You can see it if you take the front off the furnace, the wires come off it and go to the fan motor.

Jul 13, 2009 | Dayton Gas Furnace Heater

1 Answer

The fan runs all the time.

Disconnect your thermostat from the wall. If the fan shuts off then you probably have a bad or miswired thermostat.
If it continues to run, disconnect the thermostat wires from the furnace. If this shuts the fan off then you have a problem with the thermostat wires.
If the fan continues to run with the thermostat wires off of the furnace,
then you have a problem with the furnace.
Even though the fan stays on...... does the furnace still work? If so I bet you have a bad or stuck blower relay. If the furnace does not function other than the blower than you most likely have a safety control that is open. Worst case you could have a bad circuit board.
Good luck.....

Apr 10, 2009 | Honeywell Electronic Programmable...

2 Answers

My gas forced air furnace is shutting itself off after 2-3 cycles

there is a thermo-sensor switch next to the circuit board that tells the fan switch to turn on when the plenum is hot enough. this needs to be replaced.

Dec 01, 2008 | Coleman Propane Forced Air Heater...

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