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Intertherm furnace/AC, fan on the furnace won't shut off.

My fan on the furnace won't shut off. The only way to turn it off is to turn the power off or tap on the box were the wires go.

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How old is the intertherm. The old ones have fan limit switch and sometimes they stick. The new ones have a fan baord or time delay relay. They go bad from moisture and they just go bad sometimes. It sounds like you just have a shorted relay. If you think you can replace it you can get a relay at any parts store. Need the model number of unit. If not just call a service tech for free estimate. Russ

Posted on Jul 24, 2009

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I have a 1987 Intertherm FEH-015HA electric furnace. The issue I am having is that my blower will not shut of unless I pull the disconnect. My thermostat will operate the heating elements like normal,


You most likely have a bad fan limit / cycling switch. If you kill the power to the furnace see if you can trace the wires from the motor to where the connect to the switch. It looks like a round button with tabs sticking out of it for the wires to connect. Mark down where the wires were connected and take it to a HVAC business or furnace supply house. Be sure to have the model off the furnace with you so you can get the correct parts.

Nov 25, 2014 | Intertherm Heating & Cooling

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Internal fan blower on ac will not come on


Is the fan switched to "on"? does it have a control board on the furnace? Does the motor turn? Is the fan belt broken? I need more info!!

May 30, 2014 | Intertherm Heating & Cooling

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After preheat the fan cuts in for 10 sec then cuts out, cuts in for 15 sec, then cuts out. this continues to longer interviles. I have replaced computer box twice and have spent hundreds and problem


Try Googling the problem. Who have you paid so far, someone from the gas company, or a private technician? Was the technician from an Intertherm dealer? I would think a dealer would have qualified techs.

Nov 26, 2013 | Intertherm 56000 Btu Gas Furnace

1 Answer

Intertherm furnace model # MMHB-070ABHR-06 red light blinks two times


Number of flashes mean different things for diff models. The meanings of those flashes should be posted somewhere on the unit; usually inside front of the bottom service panel. Though you can't truly diagnose a problem by number of flashes they can give you an idea of where to look for a problem. There are a ton of videos and how-to's about furnaces on youtube by real service techs. Most modern furnaces have basically the same set-up and features so don't worry about your paticular brand; but of course that would be the best place to start looking. You could start here to familiarize yourself with your brand of furnace:

http://www.youtube.com/results?search_query=Intertherm+Gas+Furnace+&oq=Intertherm+Gas+Furnace+&gs_l=youtube.12...62316.62316.0.63907.1.1.0.0.0.0.202.202.2-1.1.0...0.0...1ac.Ko9QBdxK6OM



And then here:


http://www.youtube.com/results?search_query=gas+furnace+won%27t+light&oq=gas+furnace+won%27t+light&gs_l=youtube-reduced.3..0.5619.10061.0.11544.11.5.0.6.6.1.741.1982.0j1j2j5-1j1.5.0...0.0...1ac.1.5-0zJyxNMEo



Hope this helps.

Dec 21, 2012 | Heating & Cooling

1 Answer

My furnace heats up and then shuts down not kicking on blower


Your furnace is shutting off on the high limit switch because of this. You are having a problem with the blower motor. You need to check for power from the wires on the board that feeds the motor. If you have voltage, and your run capacitor is good, you have a faulty blower motor. If its a fan relay, the fan would start and run all of the time. Check power to motor right after furnace shuts the burners off.
Robert Horton

Nov 05, 2011 | Intertherm P3RA-048K Air Conditioner

1 Answer

When I turn on my furance or ac the blower is always on even though the fan is set to auto. When it is on heat it never gives off any hot air, so it never warms up the house. I had someone look at it and...


If this is a mobile home furnace they usually have a two stage gas valve. Generally they just have a delay in opening fully and are convertable from L.P to natural gas or vice versa. It is a possibilty that the gas valve is bad. If so it will have to be replaced. First I would have someone check your thermostat to see if that is what is causeing the blower to run . does the burner ever light? I wouldsuggest that you hire a service tech. who is knowledgable on intertherm furnaces. I don't recommend anyone who is not trained to change gas valves,because of safty concerns. I hope this helps you some. Thanks

Nov 12, 2010 | Intertherm Heating & Cooling

1 Answer

What's the deal? Wont shut off or respond to thermostat. . .


Red= power........White=heat.............Green=fan.................(grey)-(yellow)=cool .....these are the connectons. Disconnect these wires from the thermostat and know that red/power is the only wire that send power to the thermostat, and the rest sends it back to the unit to call for whatever,, red--to . white for heat... red to green for fan .... &red to grey for cool! OK! Turn all your power on, and use a jumper wire from red / green for fan and see if the fan comes on! Then move the jumper wire from red to green , to red / to white for heat and the fan , wait for 3 minutes before removing and going to the next step. Then red /to grey for cool and check if the outside comes on. Either you have a wire touching past the insulations and making a connection, a bad thermostat ,oe excessive wire lead touching the next connection.Thank you very much!

Nov 05, 2008 | Intertherm Heating & Cooling

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