fifth wheel furnace

Open the furnace and check for 12 volts DC on the incoming terminal block. There should be four wires, two are thermostat and two for incoming power.
Try jumpering the two blue thermostat wires. You could have defective thermostat. You can jumper either at the thermostat or in the furnace.

thx enblethen...i checked fuse iN DC.,.IN THERMOSTAT ON THE WALL...AND circut breaker on the motor housing there all good any thing else i could try

Blew the fuse in DC distribution panel

thank you ..now it has no power to the thermostat and red lite not blinking it wont turn on

Atwood 85 Series Error Codes

Internal Circuit Board Failure...........Steady on, no flashing
Limit switch/Airflow problems............1 flash with 3-second pause
Flame Sense Fault........................2 flashes with 3-second pause
Ignition Lockout Fault...................3 flashes with 3-second pause


Ignition Lockout Fault

*Low gas pressure
Set pressure to a minimum of 11 ? W.C. with all appliances running.
Replace regulator if not obtainable.

*Exhaust blocked
Clean exhaust.

*Combustion air wheel loose
Reposition wheel and tighten.

*Electrodes out of adjustment
Adjust electrode----1/8" gap between spark electrode & ground rod.

*Electrode defective
Replace electrode.

*Circuit Board defective
Clean plug contacts. If still defective, replace. (Check on board tester when possible).

*Flame sensor wire between electrode and circuit board defective
Replace wire.

*Air leakage at gaskets
Replace gasket.

*Defective heat exchanger
Replace heat exchanger.

ok

Make and model of furnace.
Please turn off your caps!

It is in lockout mod you can google any furnace and download