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My fan on my amana furnace runs all the time> it is not the thermostat so it must be a fan relay> i have a circuit board > do i have to replace the whole board or is the relay located elsewhere

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Check your thermostat setting on the fan, or you have a stuck relay

Posted on Feb 01, 2010

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When thermostat turned up furnace ignites, heats and fan starts when plenum is up to temp. When thermostat is turned down flame goes off but fan continues to run.


If your furnace is relatively new, as in 10 years old or less, there should be a field adjustable 'cool down' cycle. On the circuit board there should be a dip switch or series of dip switches with 30, 60,90,120 indications. These numbers represent the length of time the relay on the circuit board allows the fan to run AFTER the thermostat satisfies. You may be able to adjust the time frame down one position from where its positioned now.


The second possibility, if the blower never shuts off at all is that the relay itself could be stuck in the closed position and keeping the fan on.

Sep 30, 2015 | Heating & Cooling

1 Answer

Can not get fan on to turn on. All else fine. heat only furnace. No air conditioning...only air circulation.I used to set it on "Cool" and "Fan On"and get air to circulate. Do I need new thermostat?


Since you have two thermostats that operate the heating unit and the fan, and the fact that neither will turn the blower on, I would suspect the furnace/ air handler. Turn the thermostat to heat and see if the heat and the fan comes on, if it does operate normally in heat, the fan relay or the high speed on the blower is most likely the culprit. (If the furnace is equipped with a circuit board, the fan relay is integral to the board, if it an older furnace it has a separate fan relay). If it does not operate normally in the heating mode, verify power to the furnace, see if the flame comes on, if it does: the fan motor, circuit board or the fan relay are most likely the cause. hope this helps!

Jul 20, 2015 | Heating & Cooling

1 Answer

Fan will not cut off


Janet, the problem most likely is not in the thermostat. It is probably the fan relay on the circuit board in the furnace. Some furnaces have an individual fan control board, some furnaces have all the controls integrated within one control board. If your furnace is 20 years old or older, it could be the fan/limit control because at that time all furnaces did not come with a control board. If it is much older than 20 years, it is much more likely a stuck fan/limit.

Apr 12, 2015 | Honeywell Programmable Thermostat Heater

1 Answer

Why does my Ruud HVAC ventilation fan run constantly?


The two relays on the control board are for the heat (low speed) and for the cool (high speed) cycles. You should be able to determine which speed is sticking in by removing one at a time the heat speed wire and the cool speed wire. At any rate the circuit board will need to be replaced to correctly resolve the issue. If you have a 'clamp on ammeter' you could determine which wire to the motor (in addition to common) is remaining in the circuit. My concern is if the cool speed is the relay that is stuck on the motor may overheat when the heat relay closes. The circuit board reverses the position of the contacts in the two relays when in one mode or the other and stuck relay contact will not allow the opposite speed to de-energize. When you said the motor sounded like it was running 'correctly' when the cool speed was removed leads me to believe you have two winding energized due to the stuck relay and motor overheating and eventual failure is bound to occur. There is an internal winding thermostat that shuts power off when the motor overheats, but only so many times then it will remain open necessitating motor replacement.

You can definately change around the motor speeds, but you cannot use the cool RELAY for heat and vice versa as they are controlled by the board logic and inputs.

Of course there are always NEW products coming on the market that operate differently than the old systems.

Dec 27, 2014 | Ruud Heating & Cooling

1 Answer

I WANT TO HOOK IT UP TO A FAN,BUT ARE NOT SURE WHICH CONNECTIONS TO ATTACH TO.


In order to hook this up to the fan on your furnace, you will need to either have or install a Fan center @ the furnace. (Unless it is gas, and has a circuit board that will simplify the process) All this is, is a transformer, a relay, and a set (or two) of NO and NC contacts. You will need to run 3 wires from the thermostat back to the furnace, if you do not have them already. If you have a gas furnace with a circuit board then all you have to do is connect the three wires from the thermostat to the board. (R to R; W to W; G to G. If you are using an older furnace, or a oil fired appliance, power should go out of the transformer (secondary side) to the thermostat on R. It should then come off W and another wire off G back to the furnace. Connect to the appriately marked terminals on the fan center. Hope this helps

Nov 19, 2009 | Honeywell International Honeywell&...

1 Answer

No power to ac indoor fan motor


sounds like you might have a bad control board. try putting a jumper wire on the control board low voltage terminals R and G your fan should come on and run if you have 120v power to fan motor. double check that you do have 120 leaving board and going to motor. if no 120 bad board if you do have 120 bad motor. if it is the board it likely has a bad blower relay which is common in amana models and goodman equipment.

Sep 13, 2009 | Amana Heating & Cooling

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

Goodman a/c blower fan will not shut off


Unhook the thermostat wires on the furnace. If the blower shuts off then your problem is either the thermostat or the thermostat wires. If it contiues to run check you high limit switches next. If all else fails you most likely have a bad blower relay. On most modern furnaces the blower relay is part of the circuit board.
Good luck

Mar 29, 2009 | Goodman CLQ36AR49 Air Conditioner

1 Answer

ATWOOD MOBILE FURNACE RUNS WHEN IT WANTS/


Check your furnace for power. will be 4 wires. power ground and 2 thermostat wires. Check for power at the time delay relay, if you have power there check for power going in the fan motor, if power in motor wire, motor is bad. If no power in motor wire and power going to circuit board take the 2 thermostat wire apart and wrap the 2 together comimg from the thermostat. Fan will stat in about 30 seconds. If it does you need a control kit in the ac. But sounds to me like you have a furnace problem.

Jan 14, 2009 | Dometic Heating & Cooling

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