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Furnace won't kick on

Upon starting my intertherm furnace for the first time the fan runs but won't ignite ,the indicator light flashes twice,indicating a "open pressure switch".What does this mean? and how do I rectify?

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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.

Posted on Nov 15, 2008

  • Richard Jacobs
    Richard Jacobs Nov 04, 2012

    I'm having the same problem. I noticed that the plastic tube inside the furnace cabinet has water in it. Is this normal, or do I need to clear it? It's built kinda like a drain trap, so it seems like it would always hold some water in it. If it is supposed to be clear, how can I clear it?

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My gas furnace wont kick on when it has been off for awile, we have replaced the thermostate and checked eveything else. Once we gett it going it works but wont kick in once the temp drops

Posted on Nov 30, 2008

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Intertherm gas furnace in mobile home..igniter comes on then nothing tries to fire byrners but nothing


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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.

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

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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

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My furnace the burners light and come on and heat up the unit. But the fan never kicks on and blows. The fan itself works because I can turn it on manually so I know it's not that. The trouble code...


The manual selection on the thermostat bypasses the fan relay. When in Auto, the fan relay turns on the blower. You are probably looking at replacing the circuit board. As far as the three blinks, on the reverse side of the front panel there is a wiring diagram and error code chart. It will give you a starting point where to look for a problem. The three blinks could indicate an open limit because the blower is not operating. Keep the blower on manual and let the furnace run normally until you can figure out what the problem is.

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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.

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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.

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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!

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