Furnace Cycling Oddly.

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Old 10-25-17, 11:07 PM
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Furnace Cycling Oddly.

1. In which area you live and ambient temperatures you usually experience. East Central Illinois

2. House style and construction details. - Single Family Home 1904 construction.

3. Make, model and age of equipment related to the problem. Nordyne G6RC 060C-12A

4. Fuel type. Natural Gas

5. Water temperature and pressures of boiler systems.

6. What type of zoning do you have with your boiler system.

7. Thermostat type. Electric Non-Programmable

This furnace was purchased used 6 years ago and has worked fine until last year late in the year. It would start the cycle with the inducer moving air, the igniter would tick and glow but either the furnace would immediately kick off or ignite the gas for a brief moment (a second or two) and die and give me 3 flashing red LED blinks (pressure sensor stuck closed). Then the furnace would repeat ad infinitum. It turns out the condensate got backed up so I cleaned it out and the problem went away for a week or so, then it would act up very similar to what it was doing. I would tinker with the hoses in the furnace and I could get it to work for a while (a few hours or even a day or two) and I was able to get through last year.

This year I anticipated issues and a week ago I couldn't get it to start at all. I spent about 30 minutes and it just cycled the inducer, the igniter would heat up and never ignite the gas and the 3 flashing red led code flashed again. I checked condensate drain, flew, intake all the hoses inside and no blockages. A few days later when time permitted I checked again and got nothing so I called a family member to come look at it and it started right up and made a fool of me. It ran for 2-3 hours and started cycling but not firing and giving me the 3 red flashing code again.

If I let it cool off it starts most times right away for 1 - 2 minutes and then cycles the same way as before.

Should I just replace the pressure sensor at this point? Any tips or thoughts I may have missed would be greatly appreciated.
 
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Old 10-26-17, 06:31 AM
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I wouldn't change the pressure switch yet. Make sure your flue pipes are not blocked.
 
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