Question about Intertherm 56000 Btu Gas Furnace

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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

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You are over heating because of dirty filter, coils, or bad or collapsed ductwork check return especially. on the units data label there should be a max and min temp rise this is the difference from incoming and outgoing air through the furnace. Check this.
or it could actually be a bad switch.

Posted on Oct 22, 2013

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Posted on Jan 02, 2017

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diths_kri
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SOURCE: furnace blowing cold air

THERMO

Posted on Jan 07, 2009

  • 659 Answers

SOURCE: The furnace is blowing warm air even if the thermostat low.

The only thing that tells the unit to come on and off is the thermostat so I would definatly say it is it. When you turn the system back on, does the a/c run normally? If it does, then it's the problem with the heating side of the tstat. Also, does the fan come on when you put it to on and then turn of when you switch it back to auto? If it does, then the system is working fine, its the t-stat. Let me know if you have any more problems.

Posted on Mar 24, 2009

bobicehouse
  • 1524 Answers

SOURCE: Intertherm model MGHA-090-AAPQ -- combustion air keeps running

Sounds like a problem with the circuit board.

Posted on Apr 23, 2009

  • 534 Answers

SOURCE: my intertherm furnace (old model) has recently

Your blower motor has several speeds to it and by the problem you are having it sounds as though the blower motor may be going out. The motor has a slower speed for the heating cycle and since you have the noise in the heating mode I suggest having the blower motor changed as soon as possible since it could cause other problems in the heating section of the furnace( possibly burning out the high limit switches). Good Luck on your repairs hope this helped

Dave

Posted on Oct 20, 2009

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Tempstar DC90 pilot light or burner keeps going out. The furnace will run continuously. Even if I turn heat off at the thermostat. I have to kill power at the panel box to get it to shut off. Then I've...


The reset button near the ignitor is a high temperature limit safety switch. When the furnace gets too hot and the manual reset limit switch is tripped, it most likely goes into a 'safe' mode where the gas control is locked out electronically and the blower is made to run continuously to rid the heat exchanger of the excessive heat. This will continue until the reset is pushed and the power is cycled off. It will remain an endless cycle unless the reason for the overtemperature condition is not corrected.

Your furnace 'temperature rise' is getting too high due to a lack of air across the heat exchanger for whatever reason. Some of those reasons could be a restricted air filter or a blower motor that's cycling improperly on its internal winding thermostat. You could also have a dirty air conditioner 'A' coil (evaporator) on top of the furnace restricting the air flow. Nevertheless, you are going to have to have it serviced by a reputable service company's technician to correct what's wrong.

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Make sure all vents are open and filters are clean. Likely an air flow issue but possibly, though unlikely, both switches are bad.

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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)

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1 Answer

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Sounds like an airflow issue. Is the return air clean? System is not tripping the limit switch with the door off because it's getting all the air it can handle, with door on its not getting enough air???

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I would be looking at the heat exchanger. They are designed to have the heat from burnt fuel flow thru them. Cracking or pin holes will let the super heated air into the furnace interior and in there you have some over heating protection some look like buttons, older they look like an external thermostat, and these get the hot gas from the burners and trip then the furnace shuts down. When the furnace comes on again some times the blower will come right on because the sensor says hey this thing is hot when in fact it isn't. This also can and if bad enough will cause carbon monoxide poisoning, please inspect this closely or have a professional look at this. There is no price ever to great to replace a human life.Sorry probably not the answer you wanted but better safe than sorry!

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Flame sensor needs to be cleaned. turn off the furnace power switch or breaker. pull the flame sensor located in the burner runner section of the furnace. It will be easy to locate because it has 1 wire running to it. pull the screw being very careful not to harm anything else. get the sensor out. inspect it for cleanliness. clean the sensor with light grade sand paper gently. re-install the sensor plug the wire back on. restart your furnace and this should fix the problem.
CookHVACR

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1 Answer

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The fan limiting switch is acting up. It should stay running until lower temp is reached. It will cycle until the temp stays below or at the low setting. Limit switches are adjustable.

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