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Inefficient (big, yellow flame) on wall propane heater, using up propane too fast

Hi,
I have Dayton propane wall furnace. (Its 20 years old). Last yearwe went through 250 gallons of propane in 14 months. (We use wood heatprimarily, and have small tank-less water heater). This year wewent through 250 gallons in 6 months, barely used heater. It hasa big yellow/orange flame, and there was all this very fine black sootin bottom. I knew enough to know that the oxygen /propane mix iswrong, and a repair man did a Carbon Monoxide test, which read zero, sohe said the heat exchanger is not cracked, and although there's quite abit of sooty buildup, he doubted the flue was blocked. Yesterday,I cleaned out as much soot from top of heat exchanger as I could, and ahome book suggested removing/cleaning burners, and adjusting 'setscrew' to change mixture of flame. The diagram in book lookednothing like the way burners are installed, and I was unable to tellwhat and if there even was such an adjustment for propane/oxygenmixture. I realize all the sooty ash could be clogging burnersexacerbating problem, but I believe the soot is a result, not thecause of the inefficient mixture. I did notice when I turned pilotto "off", it did not go out for over 10 minutes and I had to blow itout. Is there something else I can look for on gas/safety valveto adjust, or can you tell me how to remove the burners to cleanthem? (They are up even with pilot light, which is behind panel onheater/has a little hole for lighting, but difficult to even see burnersurface.) Repair man is coming back to test gas pressure at tank, atheater (with hot water running although tank-less water heater wasinstalled 3 years ago and seems completely unrelated to furnace problemthat started 6 months ago), said the diameter of gas line at tank maybe too small or too big (although its been fine for 20 years). Isuspect its the safety/gas valve but I have no manual...Any suggestions?

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  • Anonymous Mar 27, 2014

    rinnai r85 exterior propane tankless water heater makes knocking/clicking noise. seems it tries to start with clicking noise then no fire in burners then cycles again. no error message. have two rinnia side by side other works without issue. not sure if safe to sssume gas pressure is fine. took out fan,air cleaned it,checked vent no issues. air cleaned burners,no build up where pretty clean from last cleaning 6 months ago. coils cleaned. cleaned spark and flaming rod. pieces all put back same issues. not sure how to troubleshoot to ensure gas us going in system. also to ensure spark rod is working. win d ow into burner is pitch black just cycling of clicking noise.

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A clue to what could be wrong is that you mentioned it took 10 minutes for the pilot to go out. It could be your gas valve. Get a technician in to check your gas pressure both before the gas valve and after. Have them check it as the water heater is running.

Posted on May 16, 2008

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Posted on Jan 02, 2017

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