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  #11  
Old 10-29-2020, 09:27 PM
PRO-V16 PRO-V16 is offline
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You could jump it where the tstat attach at the furnace and possibly rule out the thermostat. Just a side note, we were taught in tech school not to clean a flame sensor with steel wool or brushes. Can scratch the sensor and cause contaminants to insulate it. Clean with paper bag material or rough cloth.
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  #12  
Old 10-30-2020, 10:15 PM
cnote cnote is offline
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Quote:
Originally Posted by PRO-V16 View Post
You could jump it where the tstat attach at the furnace and possibly rule out the thermostat. Just a side note, we were taught in tech school not to clean a flame sensor with steel wool or brushes. Can scratch the sensor and cause contaminants to insulate it. Clean with paper bag material or rough cloth.
Not to derail this thread, I usually use 000 or 0000 steel wool to clean flame sensors. I have seen boiler manufactures say to use a dollar, so I did, read another boiler manual where it said to use sandpaper, I opted for a ScotchBrite pad.
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Old 10-31-2020, 06:47 AM
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yarcraft91 yarcraft91 is offline
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I clean the flame sensor with 0000 steel wool or Scotchbrite pad, whichever one I find first.
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Old 11-01-2020, 04:55 PM
rbsangler rbsangler is offline
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has the heat exchanger ever been tested, inspected or rplaced in that? Do you have a carbon monoxide detector reliably functioning in your home? 32 years is pushing the safe service life of any gas fired appliance. Be safe first....good luck with it.
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Old 11-01-2020, 07:04 PM
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yarcraft91 yarcraft91 is offline
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has the heat exchanger ever been tested, inspected or rplaced in that? Do you have a carbon monoxide detector reliably functioning in your home? 32 years is pushing the safe service life of any gas fired appliance. Be safe first....good luck with it.
Replaced, no. Tested- if you consider combustion analysis for CO in the exhaust a test, yes. We have 2 up-to-date CO monitors in the house. I agree with you, 32 years is a long time in the furnace world. I'm calling my furnace guy Monday. It appears the problem is the draft inducer system- either the motor/fan or partial blockage in the exhaust stack. The original inducer system was replaced 15 years ago. Probably overdue. I'm thinking maybe just a new inducer, maybe a new furnace. Either way, best to get this done before winter sets in for real.

The double-clutch furnace cycles are intermittent, which is a PITA to diagnose. But, I've able to narrow down the problem to either the inducer or the over-temperature sensor. Since the double-clutch can occur at the beginning, middle or near the end of a furnace cycle and the duct air temperature hasn't changed from what it was 10 years ago, my money in on the inducer blower.
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