Furnace cycles multiple times

digitalplumber

From one home owner to another, listen to the pros and find a way to get that 20 year old unit replaced.

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digitalplumber is just a name for use here, I am not a plumber!

gregzoll

Post a picture of the schematic on the door, or the manufacturer plate from that unit.

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: Don't touch it! It's the History Eraser button, you fool!
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: That's just it. We don't know. Maybe something bad, maybe something good. I guess we'll never know, 'cause you're going to guard it. You won't touch it, will you?

techpappy

JFYI the Hi Limit is part of the furnace control system and has a sensor mounted near the heat exchanger on the front of the unit...looks like small disc....If you have Air Conditioning there is a coil mounted in the duct work above or just downstream from the furnace..It could be plugged up thereby causing high heat rise due to low flow resulting in the hi/low limit to shut the furnace off..the coil should be checked and cleaned if required...