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We have anintertherm M3RL series downflow condensing furnace in our park model home.
When heat is required, the furnace cycles (seems normal) and then as soon as the cycle is complete it imediately cycles again and again until the desired temperature is reached. Each cycle is only a few minutes. Seems to me that it should run until the temperature has reached the desired setting on the thermostat.
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Could be several causes.
1. Blockage on piping
2. Water in inducer housing slowing down inducer impeller
3. Condensate trap for furnace clogged up.
4. Inducer motor going bad.
5. Leak in vacuum hoses or not connected. Welcome To the Best HVAC
Turn power off & on again. Watch to see if it cycles...it could be the hot surface igniter if you don't see it turn bright orange. If it goes straight to blowing cold air, then normally it is a limit switch open- mostly manual reset - thermal disc-located around flame rollout.
if it is a mechanical thermostat the heat ant. does that on cheaper digital tstats it is set by span and on better stats like honeywell model 5000,6000,8000 series you set the cycle rate. what kind and model number is tstat
Sounds like a downflow electric furnace? If so it sounds like you have 15kw worth of electric heat, you might have a defective heating sequencer, witch is what they call a dual on one plate.
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