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The thermostat and blower fan are fine..the furnace run fine in heat position when thermostat is turned up

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Sounds like it's working good!!

Posted on May 10, 2017

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Posted on Jan 02, 2017

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3 Answers

I have new blower motor. it dosen't stop running


Could be a bad blower motor resistor,mounted by the blower.

Sep 28, 2016 | 2002 Dodge Ram Pickup 1500

Tip

When the furnace blower runs all the time.


Usually when the furnace blower motor runs all the time
The limit switch or rollout switch is usually open or bad.
The furnace board is seeing that one of those switches is open, so it brings the blower on to try to get the heat out of the combustion chamber area, so the switch will close. But if the switch is bad and won’t close, the furnace board will keep the blower running continuously.
Make sure the fan switch on the thermostat is not in the "ON" position it should be in the "AUTO" position.

on Dec 30, 2009 | Heating & Cooling

1 Answer

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

Heil furnace blower motor stays on won't shut off at thermostat blows cold air continuously


Do you have t sat fan switch in on position??? If so blower will run continously set it to auto and it will cycle with heat call

Nov 12, 2012 | Heating & Cooling

1 Answer

Goodman furnace GMP075-3 The thermostat was in the off position over night and sometime during the night, the induced blower and blower motor came on. The trouble light on board blinks 5 times. I checked...


Need your model # to check the codes but, this coming back on after turning the t-stat off is rare. You may have been in a lockout and the furnace re-started. Some furnaces try to start three times , then lock out. Time out, then re-start. The codes should be on your furnace blower door. Write back with this info and i could help.

Oct 12, 2011 | Goodman GMS90703BXA Heater

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 | Heating & Cooling

1 Answer

The thermostat turns the heating unit off and the fan continues


check your furnace filter to make sure the furnace is not over heating. what brand of furnace do you have and how old is it?Have you changed filter to a different kind last time you changed it?

Jan 16, 2009 | Honeywell Programmable Thermostat Heater

1 Answer

Need to know which terminals run what


Had similar problem, continuous fan, turn off power, then won't start up. Replaced thermostat, no change. The main controller board in the furnace went bad. What was weird was that it happened in the summer, while the heat was turned off. One day I noticed that the fan was running. The thermostat was in the off position, and I had to shut off power to the furnace to make it stop. I forgot about it till heating season came along and it wouldn't start up. The preliminary blower would start, the gas would click on, it would light, then quit. After tracing and checking the various safety switches, etc. it became apparrent the main board was bad. I found one on ebay, replaced it, [a simple job, unplug, a few screws, replug] and it's been working fine..good luck, John

Nov 07, 2008 | Honeywell Focus 6300B 5-2 Days...

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