Intertherm furnace model E2EB-012HA will heat normally for awhile then quit. I will wake up or come home to cold house. Thermostat will show that unit should be heating but nothing is running. Thermostat shows heat running but nothing is and temperature in house is below the setting. I have turned off breaker for ten seconds and then back on. This will start the furnace and run OK for awhile then happens again. I replaced breaker thinking it might be weak but still acts the same with new breaker. Thinking it might be sequencer but not sure.

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You are going to have to try this while the furnace is not running yet the thermostat is calling for heat.

Install a jumper between terminals R & W on the furnace (where the thermostat wires connect). If the furnace starts, you have a problem with either the stat or wiring.

Should I install the jumper without turning breaker or power off? I'm thinking yes, because if I turn off power then it will just react the way it has when I've shut it off before and won't know if it was the jumper that fixed it or just resetting power.

You are correct. The jumper should be installed without breaking the power to the furnace.

You are correct. The jumper should be installed without breaking the power to the furnace.

Jumper wire did not start furnace, so what does that mean now?

Is this a gas or electric furnace?

Is this a gas or electric furnace?

Electric

Oh, sorry, I don't see many electric furnaces in my area so I don't have much info for you here. I will say that the few I have worked on (probably less than a dozen) have all been burned out elements or faulty sequencers, but of course there is much more to them than that. Please let me know what you find, and hopefully one of the other pros here can point you in the correct trouble shooting direction.

Oh, sorry, I dont see many electric furnaces in my area so I dont have much info for you here. I will say that the few I have worked on (probably less than a dozen) have all been burned out elements or faulty sequencers, but of course there is much more to them than that. Please let me know what you find, and hopefully one of the other pros here can point you in the correct trouble shooting direction.

That's what I was thinking either element or sequencer. I think I will try sequencer first since it's the least expensive. Thanks for trying to help!

Yes, I would suggest the sequencer first also. A bad element would not work intermitantly, but a sequencer often times will.