Ronecar
Member
During the night my furnace stopped blowing warm air. It will come on but only cold air comes up of the registers. I do have gas because the stove works.
Furnace problems
- Thread starter Ronecar
- Start date
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If you have answers, please help by responding to the unanswered posts.
Isaac-1
Well-known member
Do you know the brand and model of furnace? Most are either Atwood or Suburban
Rene T
Site Team
Ronecar said:
You say it comes on do you mean it fired up? Go outside and see if there is heat coming out of the exhaust tube.
Gary RV_Wizard
Site Team
I think he means the fan blows (is "on") but it probably isn't igniting the burner to provide heat. Need more details as to what happens when it first switches on, e.g. can the spark ignition be heard (three tries).
My article on Furnace Troubleshooting will help: http://www.rvforum.net/miscfiles/Furnace_Trouble-2.pdf
My article on Furnace Troubleshooting will help: http://www.rvforum.net/miscfiles/Furnace_Trouble-2.pdf
John From Detroit
Well-known member
If the batteries go low then teh fan does not blow as hard as it does with full batteries.
If the fan does not blow hard enough the sail switch won't sail and thus won't switch and the heat will not come on.
That is the MOST COMMON failure. now there are other things as well such as a bad sail switch. bad ontrol bord and several other issues.
If the fan does not blow hard enough the sail switch won't sail and thus won't switch and the heat will not come on.
That is the MOST COMMON failure. now there are other things as well such as a bad sail switch. bad ontrol bord and several other issues.
What John says ... have been there and done that. Years ago overnight at a truck stop woke up middle of night with furnace blowing cold air. As soon as we fired up the RV to leave heat came back on. (probably had to recycle on-off switch). Coach batteries got too low to give enough fan speed.
I would check for that as a first step.
Howard
I would check for that as a first step.
Howard
billwild
Well-known member
- Joined
- Dec 8, 2009
- Posts
- 882
Perhaps a thermocouple needs replacing. A cheap fix.
Bill
Bill
John From Detroit
Well-known member
Thermocouples almost (I STRESS THE WORD ALMOST) Never fail. COnnections faill. the chip on the control board that senses the thermocouple fails but two pieces of metal. different but bonded. What's to fail?????
That said. since on many RV DSI devices the thermocouple is also half the "Spark Plug" they can fail.
That said. since on many RV DSI devices the thermocouple is also half the "Spark Plug" they can fail.
billwild
Well-known member
- Joined
- Dec 8, 2009
- Posts
- 882
Almost,,,,,I had one fail in our house. Replaced it and Bobs your Uncle, it was back to normal.
Bill
Bill
Rene T
Site Team
Where did the OP go?
DearMissMermaid
Well-known member
Hope he didn't freeze to death!
Ernie n Tara
Well-known member
Therocouples don't usually fail, but it doesn't take much corrosion to disrupt a signal measured in milliVolts. Cleaning the connection(s) will usually fix them.
Ernie
Ernie
