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PumaJanVan's avatar
PumaJanVan
Explorer
Jul 05, 2016

furnace fan will not cut off

Ok, July 4th get home. Start unloading and do so.. later go back in camper and hear fan blowing. Under fridge is the furnace. fan is running (NO HEAT) we checked the thermostat all positions correct. take out fuse is the only way to get it to stop.. also this fuse works the fridge... a neighbor said to take off the thermostat cover and removed the small wires from the furnace didn't work, put it back then removed wires from fan and it still won't cut off.. Now what... we have turned off electric. husband said he hit the thermostat when coming out of our bedroom but, it looks alright to us...

Help any Ideas...
  • PumaJanVan's avatar
    PumaJanVan
    Explorer
    Jul 05, 2016
    Yes, the fan is on Auto... And no I am not sure if it is the furnace fan or converter fan... It seems to be the furnace fan to me.. air is coming out of the burner vent on the side of the camper.. and up through the floor...It is a surburban furnace and a Duo-therm by Dometic...where and what is a converter fan.... educate me please...2007 is the year of my camper...
  • janstey58's avatar
    janstey58
    Explorer
    Jul 05, 2016
    Is the fan set for "on" or "auto." I've seen this happen and it should be set for Auto.
  • Old-Biscuit's avatar
    Old-Biscuit
    Explorer III
    Jul 05, 2016
    Fuse feds DC power to 'timed delay relay' (Or Blower control on circuit board---depends on brand/model/year of furnace)

    When that 'relay' or 'circuit on board' is bad...continuous DC Power


    Wiring from t-stat (DC power) activates the FUSED DC power to fan
    Disconnecting those wires and fan still runs proves t-stat is NOT problem
    'Relay' or 'circuit board' is.


    Course this is ALL generic troubleshooting cause you have not supplied ANY information about furnace.....BRAND/MODEL/YEAR

    Kinda like asking "Is this rope long enough"?
    We know what rope IS but have no idea what it is going to be used for

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