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Thread: Furnace Cycling

  1. #1
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    Furnace Cycling

    Have a problem with our furnace cycling when starting up. Blower comes on then burner lights, stays lit for several seconds and quits. This goes on for between five and ten minutes and then the burner finally stays lit. It has been at the dealer for a week and they say it isn't right and are waiting for response from factory. By factory, I don't know whether that meant GD or Attwood. Anyone else had this problem.
    Nick and Nancy
    Abbotsford BC
    2011 Ram 3500
    2015 Reflection 303RLs

  2. #2
    Site Sponsor ACDW-Ottawa's Avatar
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    Yes! we had similar problem at PDI when we picked up our trailer last November. Except our furnace would not stay on long enough to heat trailer. Your furnace might be going into "over limit" due to over heating for any of the following reasons:
    1) heater hoses too long *** probable cause *** (we had this problem - common problem: heater hose is too long)
    2) broken heater hose * next probable cause * (we had this problem)
    3) blocked or kinked heater hose (we had this problem)
    4) heater hose disconnected from furnace
    5) not enough return air
    6) heat registers are blocked
    7) you closes or blocked off the bedroom heat register (because bedroom was to hot and main floor of trailer too cold)
    8) battery voltage could even be too low; especially if you are not running on shore power
    9) propane gas issue (maybe gas lines blocked, air getting into gas lines, bad regulator, etc)
    Aaron & Donna
    2014 Solitude 369RLS #1067
    2010 Dodge RAM 3500 SLT Mega-Cab 4x4 SRW 6.7L Cummins Diesel
    AMP Power Step Running Boards, Bed Step, & Bed Step2; Garmin RV760 GPS & EEZRV TPMS; Truck Covers USA Roll Cover
    Firestone Rear Air Suspension System, on-board compressor with 5 Gallon tank and Air port; Hijacker 16K Ultra Slider 5th Wheel Hitch, Dee Zee Truck Tailgate Assist; DU-HA Humpstor Truck Bed Storage Box; Voyager Rear Back Up Camera System
    YAKUPSŪ Vertical Kayak Rack and Custom Lippert 2" Receiver; Sailun S637ST tires; WeBoost Cell Phone Booster.

  3. #3
    Senior Member Happy Kansan's Avatar
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    Ours is at the dealership for repairs right now for the same issue. Atwood is the factory that covers the parts, warranty, etc. Initially we contacted Atwood while on the road. The Atwood tech that looked at it thinks it's a defective electrode but didn't have the part for it so we just used our fireplace which by the way is a fabulous heating device! We thought it was just for looks but NO.... that baby put out some heat. We even used it overnight when temps were in the 20's. Back to the furnace, we're done camping for the season so our dealer will have plenty of time to troubleshoot and repair.
    Happy Kansans .... DeWayne & Benita
    and one crazy little Boston Terrier named Countess Basie Marie
    2015 Reflection 337
    2013 Ford F250 6.7 Super Duty Diesel

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    It's very odd,. It only does it when starting a cold furnace. Once it has finished going through this period of cycling, it runs normaly. It's like something in the furnace has to reach a certain temperature before it starts to work properly.
    Nick and Nancy
    Abbotsford BC
    2011 Ram 3500
    2015 Reflection 303RLs

  5. #5
    Senior Member Happy Kansan's Avatar
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    Ours would never go ahead and run so maybe it's a different issue but we didn't continue to let it try to start more than 3 or 4 attempts. And the furnace did work the very first time we briefly tested it.
    Happy Kansans .... DeWayne & Benita
    and one crazy little Boston Terrier named Countess Basie Marie
    2015 Reflection 337
    2013 Ford F250 6.7 Super Duty Diesel

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    Got an update from the dealer today. The factory finally got back to them and said they think it might be the exhaust pipe. A new pipe is being ordered but the dealer said it is not uncommon for them to wait over a month to get parts. If it isn't the exhaust, then what? Wait another month or two while they throw another part at it and hope for the best. Would like this fixed before we head south after Christmas.
    Nick and Nancy
    Abbotsford BC
    2011 Ram 3500
    2015 Reflection 303RLs

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    Site Sponsor TNFSolitude's Avatar
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    From my background in furnace work; in a regular high efficiency furnace or water heater there is a flame sensor. If the flame sensor doesn't detect the burner is on, it shuts down the unit as a safety. The furnace may cycle several times before it either stays on or locks out. The flame sensor may be dirty, corroded, broken or improperly set to not detect the burner. I don't know if the Atwood has this feature, but if it was my own it would be something I'd look at. Just my 2 cents, good luck.

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    The trailer isn't here so I don't know the model number but the Attwood manuals I can find on line point to the flame sensor, circuit board or blocked exhaust. Hard to see how the exhaust on a new furnace could be blocked unless it was damaged on installation or there was a bad batch or exhausts. The odd thing is, if it is the flame sensor it is supposed to lock out after the third try. It doesn't, it just keeps cycling until it finally stays lit. Circuit board maybe?
    Nick and Nancy
    Abbotsford BC
    2011 Ram 3500
    2015 Reflection 303RLs

  9. #9
    Site Sponsor TNFSolitude's Avatar
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    I always hated trial and error method to repair a furnace. Fortunately for you it's still under warranty, once you get it into the dealership don't pull it out unless you're 100% sure the furnace is going to work 100% of the time. Good luck, let us know what it turned out to be.

  10. #10
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    Will do. We are headed Down Under for a month. The dealer says they will keep us informed by email.
    Nick and Nancy
    Abbotsford BC
    2011 Ram 3500
    2015 Reflection 303RLs

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