Question about Intertherm Heating & Cooling

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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 he got the ignitor to glow, but could not get any gas to the unit. He was not knowledgeable of intertherm furnaces. He told me I needed a new gas valve. I read that this furnace has dual gas shut offs. Could that be the problem? If so how do I correct it?

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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

Posted on Nov 13, 2010

  • corneliust Nov 14, 2010

    I do have a mobile home. The furnace never lights, even though the ignitor coil has glown at times. There are no technicians in this area that are knowledgeable in working with the intertherm furnaces.

  • Jack Spooner Nov 14, 2010

    Ok what I would try is to use a volt meter and check for voltage to gas valve. First turn thermostat to call for heat and put one probe from meter to terminal on gas valve marked th and the other to tr. You should read about 24 volts A.C. I would think that if ignitor is glowing then you probably have voltage to gas valve.If you do then I would take information from gas valve rating plate. It should tell you manufactures name,model,number and possibly gas type. Try to locate a exact match if you can, there are several ways to make other valves work but I would not recommend this. If you can find the right valve then turn off power and gas to unit. Usually it is easier to remove gas valve and burner at the same time. Remove screws holding covers around gas and pilot lines,sometimes there is a screw that holds burnere in place but usually it just slids in a slot in burner compartment. There should be a union on gas line to remove it from gas valve.dissconnect wires from gas valve being sure to mark them for proper hookup on reinstallation. Remove gas valve and burner assemble from furnace. Also dissconnect wireing for igniter. Removegas line to burner from outlet side of gas valve, and any pipe nipples or fitting to inlet side. To install new gas valve reverse sequence. .I hope you can get the right gas valve as this will make it much easier. On most new gas valves they will have a 3/4 x 1/2 inch pipe bushing if so use teflon tape or pipe joint compound on all threads and install. If you have to sub. a universal valve they may also have multiple Outlets so plug what you don't need. Finish installation,hook up wiring,turn on gas and check for leaks on all gas fittings,you can use dishsoap on threads if you suspect leaks if there is aleak soap will bubble ,fix leak befofe proceding. Finish and check everything before trying to turn furnace back on.I hope this helps. If I can do anything more let me know. Thanks

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