Suburban Model T34 or T36 wont light Furnace

[ncognet0]

My son has a 86 Southwind Class A motorhome and the furnace wont light. We have replaced the electrode and it still wont light. You can hear a clicking sound like it is trying to light, but it just wont light. Any suggestions?

Regards

Steve

[Old-Biscuit]

IF you hear clicking sound (spark electrode firing) then motor is running, sail switch has made up and power has reached circuit board (spark electrode won't fire otherwise)

Need to check IF gas valve is getting power and/or if gas valve solenoids are working.
Power goes to gas valve solenoids at same time power goes to spark electrode
(Power on gas valve solenoids for 6-8 seconds during spark electrode firing)

Problem could be faulty solenoids on gas valve
OR obstruction/blockage in main flame orifice---burner tube
OR dirty/obstructed burner
OR misaligned spark electrode

That vintage (old) of furnace probably could use a through cleaning

[newman_fulltime]

Check the 30amp fuse on the battery.
Clean the sail switch
You could have a bad board

[ncognet0]

The stove and hot water work but not sure on the CO.

[newman_fulltime]

Is the co monitor on?
Do you have gas?
Does the stove and hot water heater work