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I have a intertherm furnace seems like it heats but blower will not come on,I have central air and the blower will run for air not heat

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  • 148 Answers

If you an older model furnace check your fan/limit control

Posted on Nov 10, 2013

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Posted on Jan 02, 2017

  • 49 Answers

SOURCE: intertherm furnace

That is a stack limit switch. You are not venting properly. Is your unit power ventilated or gravity fed?

Posted on Nov 28, 2007

  • 49 Answers

SOURCE: Intertherm E1EH-015HA FURNACE no heat

Sounds like a downflow electric furnace? If so it sounds like you have 15kw worth of electric heat, you might have a defective heating sequencer, witch is what they call a dual on one plate.

Posted on Nov 28, 2007

hotuna
  • 288 Answers

SOURCE: ruud silhouette II furnace

Yes. On the board mounted inside the furnace box. There will be a series of posts that have numbers printed below each post. The heat motor uses low speed so it should be a sort of fat (larger than most of the other wires) red wire attached to one of the posts. If the wire is on 60, for example, then move it to the next lower post, like 30. unplug the cord on the furnace first. The wire SHOULD be red but may be blue, don't let the color guide you, look for the place where the wires go. If you find the place I'm talking about and the wire is black, then let me know, because its wired to high speed, which is wrong. I will help you.

Posted on Mar 13, 2008

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

  • 587 Answers

SOURCE: Intertherm MGHA-075BFC-01 gas fired furnace - air

Probably the limit switch is open.

Posted on Oct 16, 2009

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It is possible that high temp limit is shutting you down.make sure your blower is running when t-stat is calling for heat.if notstart at the heat sequencer which cuts the blower on with first bank of heat. it will be dangerous and difficult to troubleshoot this prob without a multimeter and experiance with elect. components

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My intertherm furnace (old model) has recently getting quite loud and clunky during its heating cycles, sound like the blower maybe??


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

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1 Answer

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Sounds like a downflow electric furnace? If so it sounds like you have 15kw worth of electric heat, you might have a defective heating sequencer, witch is what they call a dual on one plate.

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