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Re: i have a intertherm furnace that won't kick out just...
Hello , I think I can help , with the power off to the unit disconnect the wiring on the thermostat and remove it make sure the wires are not touching, turn power back on and see if the unit still runs , if not thats the problem pickup a new tstat , if it still runs then you have a sticking contactor in the control panel of the unit , all of the componets in the unit feed off the contactor and its easy to find its about two inches by 3 inches. There are a set of contacts in it that will be blackend or burnt , remove, label all wires where they were going and pickup a new one at any Hvac, A/C warehouse.
Hope that helps , let me know how it turned out.
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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:
The blower may cycle on and off to cool the heat exchanger. The fan limit still senses the heat after the furnace shuts off and the limit goes up the same as when the furnace first starts. You could adjust the settings on the fan limit.
Make sure fan relay is wired correctly (G) wire. Ensure the fan on therm is not on, it should be on Auto or off.
If your furnace is short cycling because it has to keep heating your home, the delay in the control board may be staying on to compensate for the exchangers getting hot. If it heats normally, then put your attention to your thermostat.
Set the heating system on aux heat only. Fan should not be on, if it does stay on after a heating cycle, see if the furnace is heating normally, and reaching temp as desired before the heat comes off. Then check the therm wiring, pull the face of the therm, disconnect green wire (fan) and try the heating again.
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.