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My Intertherm, electric ignition furnace will hum and hum but not click on. There are two yello flashing lights until we reset it by turning off the gas and turning down the thermostat. The unit resets itself and I get a steady red light when its working. Is this a pressure switch issue?
Re: My Intertherm, electric ignition furnace will hum and...
That blinking yellow light is an error code. If you look behind the main cover there will be a wiring diagram and error code chart. This will give you an idea what the problem is.
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by igniter I assume you mean the thermocoupler. are you turning the control button to run after you light the pilot light? Normally when those furnaces quit it is the thermocoupler that has quit. Get a new one and leave it in the furnace compartment as a spare.
This is a house furnace with ducts? If so if the pilot light on? Do the burners light? Do you hear a clicking? There is a reset button on the top usually between two screws. On mine the ignition solenoid went out, had to order online. This is the thing that clicks. If it clicks for a while but the burners do not light that is the problem. Mine would click for five minutes before lighting the burners. I hope this helps.
Furnace burner and heat element are not the same. I think the fan time delay, a sensor that turns the fan on when this sensor senses heat, is shot and needs replacing, for a furnace type heat ( gas heat)
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:
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.
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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