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Guides are only intended for use on Atwood™ products by service technicians who have successfully completed
Atwood™ training. This guide should be used in conjunction with the appropriate Instruction Manual provided
with the product and any applicable Industry Standards. This is not intended to be a complete list. Please
direct questions concerning service of Atwood™ products to 815-877-5700 or
service@atwoodmobile.com
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BURNER FAILS TO IGNITE AND BLOWER FAILS TO RUN
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CONDITION
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SOLUTION
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No electrical power to the furnace
Thermostat defective
Thermostat wires broken or shorted
Current overload protector device defective or
tripped (circuit breaker)
Blower relay defective
Wire off motor
Wire off relay
Improper ground
Blower motor defective
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- Reconnect or replace power source*
- Replace thermostat
- Replace wire or wires*
- Reset circuit breaker
Check amp draw from motor according to furnace's specification
- Replace relay
- Reconnect wire
- Reconnect wire
- Clean and secure grounds*
- Replace motor
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BLOWER RUNS BUT FAILS TO IGNITE
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CONDITION
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SOLUTION
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Low voltage
Gas pressure incorrect
Furnace grounding wires not secure
Air intake restricted
12 volt polarity reversed
Motor running slow
Exhaust blocked
Combustion air wheel loose
Sail switch defective or wire off
Limit switch defective or off wire
Edge connector on cicuit board dirty
Circuit board defective
Gas valve defective
Main burner orifice blocked
High tension lead wire defective
Electrode out of adjustment
Electrode defective
Obstructed burner head
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- Correct Power Supply*
- Set pressure to a minimum of 11"W.C. with all appliances running. (Replace regulator if not obtainable).*
- Clean and secure grounds established*
- Clean air intake*
- Correct polarity*
- Check voltage first
If 12 VDC while running, replace motor
- Clean exhaust*
- Reposition and tighten
- Reconnect wire or replace
- Reconnect wire or replace
- Clean with pencil eraser
- Clean plug contacts. If still defective, replace. (check on board tester when possible).
- Replace valve or valve coil, depending on problem encountered
- Clean main burner orifice or replace
- Replace wire
- Adjust electrode (take care not to damage porcelain)
- Replace
- Clean burner head*
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BURNER IGNITES BUT IGNITION SYSTEM "LOCKS OUT" AND TURNS BURNER OFF
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CONDITION
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SOLUTION
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Low gas pressure
Exhuast blocked
Combustion air wheel loose
Electrodes out of adjustment
Electrode defective
Circuit board defective
Flame sensor wire between electrode and
circuit board defective
Air leakage at gaskets
Defective heat exchanger
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- Set pressure to a minimum of 11"W.C. with all appliances running. Replace regulator if not obtainable.*
- Clean Exhaust*
- Reposition wheel and tighten
- Adjust electrode according to furnace specifications
- Replace electrode
- Clean plug contacts. If still defective, replace. (Check on board tester when possible).
- Replace wire
- Replace gasket
- Replace heat exchanger
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SOOTING (caused by lazy yellow flame)
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CONDITION
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SOLUTION
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Low gas pressure
Low voltage
Air leakage at gaskets
Combustion wheel installed backwards
Blockage in heating chamber or burner head
Faulty motor
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- *Set pressure to a minimum of 11"W.C. with all appliances running. Replace regulator if not obtainable
- Correct power supply*
- Replace gaskets
- Reposition wheel and tighten
- Clean or replace
- Replace motor
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FAN RUNS CONTINOUSLY WITH THERMOSTAT "OFF"
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CONDITION
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SOLUTION
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Defective thermostat
Shorted thermostat leads
Defective relay
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- Replace thermostat
- *Replace wire or wires.
- Replace relay
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LIMITING = BURNER CYCLING ON AND OFF
BLOWER RUNS CONSTANTLY WITH THERMOSTAT ON
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CONDITION
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SOLUTION
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Furnace over fired
Restricted return air supply
Restricted or insufficient discharge ducting
Defective limit switch
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- Set 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.*
- Make sure return air meets furnace's minimum requirements.*
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a. Ducting must meet furnace's minimum requirements*
b. No excess ducting or unnecessary bends*
c. All closeable registers must be fully open and unrestricted*
- Replace limit switch
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BLOWER SHUTS OFF AT SAME TIME BURNER SHUTS OFF
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CONDITION
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SOLUTION
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Wired wrong
Faulty relay
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- Correct wiring*
- Replace relay
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BLOWER VIBRATES OR IS NOISY
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CONDITION
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SOLUTION
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Motor mount loose
Damaged blower wheel
Motor shaft bent
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- Tighten motor mounting bracket
a. Ducting must meet furnace's minimum requirements*
b. No excess ducting or unecessary bends*
c. All closable registers must be fully open and unrestricted
- Replace blower wheel
- Replace blower motor
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INSUFFICIENT HEAT
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CONDITION
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SOLUTION
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Furnace under fired
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- 1. Set gas pressure to 11"W.C. with all appliances running. Replace regulator if not obtainable.
Also, check main burner orifice, it must comply with furnace's specifications*
- 2. Check ducting and return air according to furnaces specifications*
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* not covered under warranty
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