Help ! Propane heater not working…

[RvPanda]

I’ve replaced limit switch, sail switch and electrode … still blowing cold air… any suggestions??

 

[TonyL]

Does it attempt to light then go out?
A little more information on what exactly is and is not happening would help

 

[johnhicks]

Bad ignitor, bad ignitor-burner distance, bad burner, bad orifice, orifice full of bug carcasses, bad board, of course assuming propane flow is good. Does it try to light and go out, or not try.

 

[RvPanda]

Does it attempt to light then go out?
A little more information on what exactly is and is not happening would help

Blower comes on runs through 2 cycles and goes off … I do hear three clicks.

 

[RvPanda]

Bad ignitor, bad ignitor-burner distance, bad burner, bad orifice, orifice full of bug carcasses, bad board, of course assuming propane flow is good. Does it try to light and go out, or not try.

Propane does flow fine…. Blower comes on and I hear 3 clicks runs through cycle twice and doesn’t come back on.

 

[Domo]

What is the year, make, of your RV and the heater?

If a few years old, very likely the burner is rusted/plugged as others have suggested.

 

[RvPanda]

2008 Cedar Creek ForestRiver 5th wheel

 

[TonyL]

When was the heater last working correctly?

 

[RvPanda]

Last year

 

[Domo]

Still don't know what type of furnace it is...

2008 - same year as my MH - If you can hear a click, see if you can observe a spark - I'll bet the burner is rusted and broken therefore air/fuel mixture is not correct - I had to replace mine...

Have you downloaded and followed the mfg troubleshooting guidelines?

 

[Kirk]

If you would post the make & model of your furnace we could then look at the service manual to give more specific information. Since you seem to be getting an attempt to ignite, that would indicate that the sail switch is being actuated by the air movement, as it should be. The next thing is to use a multimeter to see if the propane valve is getting 12V power and also to check for an open winding on the valve solenoid. If you can, try to watch the burner area as someone else turns the thermostat up to call for heat and see if you can see the flame burning before it shuts off.

You said that the propane "does flow fine." How did you determine that?

 

[Domo]

If you would post the make & model of your furnace we could then look at the service manual to give more specific information. Since you seem to be getting an attempt to ignite, that would indicate that the sail switch is being actuated by the air movement, as it should be. The next thing is to use a multimeter to see if the propane valve is getting 12V power and also to check for an open winding on the valve solenoid. If you can, try to watch the burner area as someone else turns the thermostat up to call for heat and see if you can see the flame burning before it shuts off.

You said that the propane "does flow fine." How did you determine that?

Maybe third time will be the charm?

OP - furnace model, please...

 

[John From Detroit]

If it's a Dometic/Atwood there is a switch (Really a circuit breaker) on top of the blower housing (outside behind the removable outer panel) You can use this to test or a partner. here is the test.
Either turn switch to OFF or have partner turn thermostat to OFF... Now standing next to it have it turned back on (either turn on switch or partner turns on T-Stat) listen for ignition feel (About 6"-12" from exhaust port) for heat.. if so it's lighting

Read on
IF it's not lighting listen for the "CLICK" of the gas solenoid. not the same as the SNAP of the ignition system

Also listen for the Snap
No click, Measure voltage at solenoid should be battery voltage during ignition attempts
No Snaps... Check spark gap

Lights but.. alas turns off
Some folks say if you clean the sensor rod.. which on many is also the ignition rod.. it helps...
In my case it was the control board A new one from Dinosaur boards and it lasted many years.

 

[TonyL]

If it hasn't worked since last year,vi agree with others that more than likely the burner needs stripping out and cleaning.

 

[Mr Lars]

All the other gas appliances working?