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Old 10-11-2016, 10:35 PM   #1
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Furnace concern

hi i have a older duo therm furnace in my 1985 prowler travel trailer. last year during a camp it started acting up. it ran great for about 3 days and then would just shut down. it would then restart and run fine for about 10-15 mins and then do the same thing - it eventually would act up about every 5 mins shutting down and then restarting blower comes on, furnace ignites all fine but just shuts everything down abruptly and then will go thru its normal start-up sequence. any ideas?
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Old 10-11-2016, 11:00 PM   #2
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It is called 'limiting'

Furnace High temp limit switch is OPENING (shutting down furnace) then cools off CLOSES and furnace restarts

Could be bad High Temp Limit Switch (have to pull heat exchanger to replace)
Could be restricted air flow.....either in discharge side OR in return side (area around furnace needs to be free/clear for return air flow and registers open/ducting un obstructed for discharge)
Could be furnace 'over-firing' ( propane pressure too high....S/B 11" WC )
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