Atwood furnace troubleshooting

The wide range of equipment from Atwood includes furnaces. The quality of products of this manufacturer is known worldwide. However, breakdowns of this equipment occur. In these cases, troubleshooting furnace system Atwood will help you. You can acquaint yourself with it through our table below. It is represented in a simple form.

CAUSESOLUTION
BURNER FAILS TO IGNITE AND -BLOWER FAILS TO RUN
No electrical power to the furnaceReconnect or replace power source.
Thermostat defectiveReplace thermostat
Thermostat wires broken or shortedReplace wire or wires
Current overload protector deviceReset circuit breaker. Check amp draw from motor
Defective or tripped (circuit breaker).According to furnace's specifications.
Blower relay defectiveReplace relay
Wire off motor Reconnect wire
Wire off relay Reconnect wire
Improper groundClean and secure grounds
Gas pressure incorrectSet pressure to a minimum of 11" W.C. with all appliances running.
Furnace grounding wires not secureClean and secure grounds established
Air intake restrictedClean air intake.
12 volt polarity reversedCorrect polarity
Motor running slowCheck voltage first. If 12 VDC while running, replace motor.
Exhaust blockedClean exhaust.*
Combustion air wheel looseReposition and tighten.
Sail switch defective or wire offReconnect wire or replace.
Limit switch defective or wire offReconnect wire or replace.
Edge connector on circuit board dirtyClean with pencil eraser
Circuit Board defectiveClean plug contacts. If still defective, replace, (check on board tester when possible).
Gas valve defectiveReplace valve or valve coil, depending on problem encountered.
Main burner orifice blockedClean main burner orifice or replace.
High tension lead wire defectiveReplace wire
Electrode out of adjustmentAdjust electrode (take care not to damage porcelain).
Electrode defectiveReplace
Obstructed burner headClean burner head’
Low gas pressureSet pressure to a minimum of 11" W.C. with all appliances running.
Exhaust blockedClean exhaust.*
Combustion air wheel looseReposition wheel and tighten
Electrodes out of adjustmentAdjust electrode according to furnace specifications.
Electrode defectiveReplace electrode.
Circuit Board defectiveClean plug contacts. If still defective, replace. (Check on board tester when possible).
Flame sensor wire between electrode and circuit board defectiveReplace wire
Air leakage at gasketsReplace gasket
Defective heat exchangerReplace heat exchanger
Low voltage Correct power supply
Air leakage at gaskets Replace gaskets
Combustion wheel installed backwards or looseReposition wheel and tighten.
Blockage in heating chamber or burner headClean or replace
Faulty motor Replace motor
Wrong vent kit or draft cap Replace with correct vent kit or draft cap
Defective thermostat Replace thermostat
Shorted thermostat leads‘Replace wire or wires
Defective relay Replace relay
Furnace over firedSet gas pressure to a minimum of 11" W.C. with all appliances running replace regulator, if not obtainable. Also, check main burner orifice, it must comply with furnace's specifications.
Restricted return air supplyMake sure return air meets furnace minimum requirements.
Defective limit switchReplace limit switch
Damaged blower wheelReplace blower wheel.
Motor shaft bentReplace motor
Furnace improperly sized for coach/or conditionsReplace furnace with proper size.

Error codes and troubleshooting