Question about AO Smith Intertherm Furnace Motor 1/8hp 1050 RPM 2-Speed 115 volts 90

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Intertherm furnace has no flame

Furnace will kick on but wont ignite-theres no flame

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It has an ignition control problem. Check the ignition transformer, relay, and the fuse.

Posted on Nov 06, 2012

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Posted on Jan 02, 2017

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Why does it start, then shut down followed by 3 clicks?


  • Thermostat calls for heat
  • Venter motor starts
  • Air switch verifies vacuum
  • Igniter sparks, or glows - depending on furnace
  • Flame starts in burner
  • Flame rod senses flame
  • Burner continues to burn until thermostat stops calling for heat
By your description, I would polish your flame rod, it will be a metal rod that is insulated from the bracket that is screwed to the furnace case and it will have a single wire attached to flame rod,

Sep 29, 2015 | Intertherm 56000 Btu Gas Furnace

1 Answer

Furnace won't stay lit. Intertherm Model M2RC-080A-16BN. Ignightor glows, flame starts and after a few seconds the flame shuts off. Then it starts the cycle again. It goes thru this cycle a fe


It sounds like the flame sensor is bad. If thats not the case you may need to replace the control board. You should make sure the flame sensor is directly into the flame.

Nov 20, 2014 | Intertherm Heating & Cooling

1 Answer

Furnace will not run complete cycle ,several clicks and the and the furnace shutdown and restarts, will not bring the house to temperature


If it's a 90%+ gas furnace, check the combustion air pvc pipe for blockage, if not enough air for proper combustion, control board will shut down the flame to keep from burning poorly! Check your air filter, there's an overtemperature safety switch in the heat exchanger to protect the furnace/ your house, and low airflow will cause the heat exchanger to overheat. Finally, check to see if the flames actually ignite, if no flame, the controller will reset and try again, then if no flame, the controller will reset and try again, then if no flame, the controller will reset and try again, then if no flame, the controller will reset and try again.... get the idea? :) If this is the case, check my other solutions, I just answered someone elses question about non ignition. Hope this helps.

Mar 23, 2013 | Intertherm P3RA-048K Air Conditioner

1 Answer

Furnace has does not ignite flame


how often do you replace your filter?

On the limit switch that protects your unit when it gets to hot the number one reason is dirty filter.

The pressure switch is located in the upper side of cabinet has a rubber hose connected to it. They very rarely go out though. So find your vent fan the first fan that comes on and follow the rubber hose to the switch.

Feb 09, 2009 | Intertherm P3RA-048K Air Conditioner

1 Answer

Weak flame in intertherm furnace


Ok, so we can rule out the ignitor. (standing pilot systems can develop problems that will cause such symptoms.)

Check the gas pressure, make sure you are getting 11 to 14 PSI.

You need that after the regulator all the way to the manifold.

Also check for cracks in the heat exchanger, causing the wind from the blower to distort the flame pattern enough to cause improper contact with the flame sensor.

Make sure the burners and flame channels are clean of rust, and dibri build up, allowing the flame to properly contact the sensors.

Jan 18, 2009 | Intertherm P3RA-048K Air Conditioner

1 Answer

Intertherm model e3eb020h electric furnace won't start just hums


Check fuses. one may be blown, and the other one not, Therefore you are getting only 110V to a 220v circuit.













Dec 03, 2008 | Intertherm Heating & Cooling

2 Answers

Furnace won't kick on


Downstream of your fan discharge there is a little plastic assy. most likely that will have a pickup tube and a piece of vinyl or latex tubing attached. First check to make sure that the pick up tube and/or tubing does not have a restriction. If it is clean use an ohm meter to read resistance across the switch to verify it is operating.

Nov 15, 2008 | Intertherm Heating & Cooling

1 Answer

I have an electonic start furnace. Everything kicks on but the heat. It's like the burners won't light up. I don't have a lot of money to fix it so I was wondering if I could somehow trouble shoot the...


yes! The furnace goes through 4--steps for complete run time. Step -1 the small vent fan comes on, and prove it thru the small rubber tube that sucks the switch close and tells the c.b. its turnning, Step 2.. the glow plug glow and 08 seconds later, Step -3 then the gas valve open and dump in gas ,which ignites and heat up the box. and proves it got flame through a flame sensor (pin) sticking in the flame .& Step -4, the box heats up to a predetermined temp. and turn on the fan! thats all. Thank-you-very-much!

Aug 27, 2008 | Intertherm Heating & Cooling

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