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When is it best to turn my thermostat to fan mode only?

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When the temperature is moderate.

Posted on May 29, 2011


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Why doesn't the fan come on? Used to work fine with the old thermostat.

Some of the new programmable t-stats have to have the fan configured to run in the heat mode. I'd suggest going though the configuration menu and check to see that it is set correctly. I'd bet its not. Some furnaces require the stat to turn on the fan in the heat mode just like it turns the fan on in the cool mode whereas other brands of furnaces have the fan control built into their control scheme.

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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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Change battery on thermostat.
Usually located back of thermostat.

If you need further help, I’m available over the phone at

Oct 16, 2012 | Hunter Fan Company 5/1/1 Programmable...

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Have installed a new Honeywell thermostat. The fan does not turn off even when the room has reached the desired temperature. I originally replaced th ethermostat because the old one the fan ran forever and...

Most T-Stats have a On / Auto on a forced air system. On means the fan will run all the time even if it is not calling for heat. Auto only runs when calling for heat. Does the fan turn off in the auto mode at all? To test it...BE SURE THE FAN IS IN THE AUTO MODE ON THE T-STAT... Turn the thermostat all the way down and keep it there for appox 15 mins. If it is wired properly and the fan limit is set properly the fan should turn off. If it doesn't it is not the thermostat were the problem lies.

Most forced air units have a fan / high limit switch. There is a setting on the switch for the fan to turn on and a setting for the fan to turn off or it has a setting and a differental switch for it to turn off/on. Example - the fan comes on when the temp in the heat exchanger reaches 110 degrees F and will shut down at 95 degrees F after the thermostat is satified...this would hav a differental of 15 degrees F. It may be set to low and the fan continues to run long after all of the heat has been removed from the heat exchanger. This in turn will cause cool air to be coming out of the registers.

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1 Answer

1998 ford taurus, fan keeps running after you turn off engine-ran battery down.

The thermostat for the fans has failed in the power-on mode. You can either replace the thermostat with a factory unit or if you are handy with automotive wiring, an aftermarket fan thermostat can be added to the circuit to control the fans.

Apr 27, 2010 | 1998 Ford Taurus

1 Answer

I have a 1.5 hp kelvinator wall mounted air cond.It has three button (cool,fan,and dry)If I want to get the room really cold what is the best button to push

The best button to push for that is the cool button, then turn the thermostat all the way to cold.
The fan button will only move air around and will do no cooling.
The dry button is for dehumidification, in this mode the unit will run a low speed fan over the cooling coil to take the water out of the air.

So for cooling your best option is to push the cool button and crank down the thermostat...


Jan 11, 2010 | Heating & Cooling

1 Answer

Car is reaching 220 when i dont come on

On that car when you put the A/C on it throws it into a bypass mode to where the fan runs it's normal,but when you don't have the A/C on The fan should come on around whatever the thermostat rating is . try dropping the thermostat down to a 165 rating and also check your tempature sensor to see if it's operating at the right setting. Useually when a car over heats it'll damage the sensor so best to replace it to make sure and check your water pump flow also,it should move the water in the radiator quite rapidly whenever the thermostat opens .

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Attic fans

I just fixed a Broan-353 with a similar problem - the fan was short-cycling, turning on and off within a minute or less.

These fans have a thermostat which is designed to turn off 10 degrees below where it's set to turn on. Apparently, one failure mode is this temperature delta stops working I've had this happen twice, each time after about 3 years.

Replacement thermostats are available from Broan for about $30 It's a 10 minute repair if you have easy access to the fan.


1 Answer

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on t-stat sounds like the G and Y wires are crosseed G on stat is for blower operation ,and Y is for A/C, W for heat, R for 24V and C for commom of 24V call back installer if under warranty

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