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Intertherm furnace mac2460 heating eliment continues to heat

After the therastat has retch its set tempiture causing the fan to continue to run trying tocool the eliment

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Sounds like a bad blower relay,intertherm will sometimes use a control board

Posted on Jan 21, 2009

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

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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.

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I have a Braeburn 3200 and when the the temperature reaches the desired heat setting. The furnaces heat will shut off, but the fan will continue to run indefinetly. eventually blowing very cold air up


The fan relay is stuck in the on position. When the temperature drops the heater does not ignite because the fan is already running and ignition is locked out after the heat cycle starts an the fan turns on

Nov 16, 2014 | Heating & Cooling

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Furnace lights blows heat in cycle, pops sensor on blower and continuosly blows air until button on sensor is pushed back in


If the sensor knocks the unit off and the the fan keeps blowing without a flame ,the limit (the sensor is a limit comptroller that turns off flame @ a set temp and allows the fan to run until the heat exchanger cools to @ set temp) has out lived its lifetime and needs to be replaced.the button is a manual reset that once reset would allow the unit to continue to run flame and blower at the same time after having been set once, if it is an ongoing problem and needs to be reset more than once then replace the limit control (sensor) in kind. (With the same mode and set-points for the limits)

Oct 25, 2012 | Intertherm 56000 Btu Gas Furnace

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When furnace runs blower won't run.as soon as furnace stops blower runs. They never both run.


Sounds like fan limit switch/fan timer

This will cause the main burner to run untill the over tempreture switch is tripped therefore shuting gas supply and running fan on high till over heat condition is resolved then it will restart burner and repeat
continuing to run heater like this will cause heat exchanger split.

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I have air coming from the vents but no heat. The furnace is 23 years old and I've never replaced anything in the unit. Best guess? GE Intertherm. thanks


If the thermostat is set on Fan and not Auto the fan will continue to run. If the fan control is bad or is set at too low of a setting, it will blow cold air after the furnace has shut off. From what I guess of your explanation, your furnace is not producing any heat and the room air blower runs blowing cold air. You may have two issues happening. Make sure your thermostat is calling for heat by setting it to a high setting. Inspect the thermostat to see if it is set at Auto. Go to the heating system and inspect it to see if it is heating. If you can't view any flames carefully touch the exhaust pipe and see if it is hot. If not, you have a no-heat condition. A 23 year old furnace may need some TLC so call a technician you trust. He/she may need to replace the ignitor or thermocouple to get it going. They will also check out why your fan is running when it should not.

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I have an intertherm electric furnace FEH-A020, with multispeed blower installed when A/C added. My problem is blower operation. at the end of the cooling season with fan set to auto operation the fan ran...


The model of T-stat you gave comes up as a discontinued model on Honeywell's web site, but it looks to be a manual stat that type of stat would have to be wired with a summer winter switch with electric heat, allowing it to turn on the fan with a call for heat. If yours is a programmable T-stat you would need to select electric heat or in the installers set up change the default setting for fan from unit controls fan in heat to thermostat controls fan.

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Intertherm propane furnace makes popping sound when running


It sounds like you have a possible hole in the heat exchanger. Turn the heat off and turn the fan on. If you feel any air coming back out of the heat exchanger, you have a hole. A yellow flame is not a good sign. I would even consider having a service professional come out and take a look.

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Ruud air to air heatpump intertherm propane furnace honeywell th5220d non programable thermostate.fan on furnace will not turn off in aux.mode even though the furnace heat kicks on and off. thank you for...


Make sure fan relay is wired correctly (G) wire. Ensure the fan on therm is not on, it should be on Auto or off.

If your furnace is short cycling because it has to keep heating your home, the delay in the control board may be staying on to compensate for the exchangers getting hot. If it heats normally, then put your attention to your thermostat.

Set the heating system on aux heat only. Fan should not be on, if it does stay on after a heating cycle, see if the furnace is heating normally, and reaching temp as desired before the heat comes off. Then check the therm wiring, pull the face of the therm, disconnect green wire (fan) and try the heating again.

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