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Furnace - Pilot Model
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 866-869-3118 option 5 before proceeding 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
Thermostat located in high area
Current overload protector device
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*
- Relocat thermostat
- Reset circuit breaker. Check amp draw from motor defective or tripped (circuit breaker)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
/ High 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
Gas valve defective
Burner orifice blocked
Broken or loose wire
Pilot orifice plugged
Thermocouple defective
Pilot assembly defective
Burner head adjustment
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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
- Replace valve or valve coil, depending on problem encountered
- Clean main burner orifice or replace
- Replace or tighten wire
- Clean or replace orifice
- Replace thermocouple
- Replace pilot assembly
- Reposition and tighten. Adjust burner according to furnace specifications.
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BURNER CYCLING ON AND OFF - BLOWER RUNS CONTINUOUSLY 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 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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Faulty relay
Thermostat wired wrong
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- Replace relay
- Correct wiring*
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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
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- Reconnect or replace power source*
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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
Restricted discharge duct system requirements*
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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PILOT FAILS TO IGNITE OR STAY LIT
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CONDITION
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SOLUTION
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Plugged pilot orifice
Electrode out of adjustment
Pilot tube defective
Piezo sparker defective
Defective thermocouple
Defective valve
Vent kit not sealed
MICA window missing
Combustion air hose plugged or collapsed
Water in propane
Burner plate gasket or pilot gasket not sealed
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- Clean or replace pilot orifice
- Adjust electode to furnace's specifications
- Replace tube
- Replace sparker
- Replace thermocouple
- Replace valve
- Seal vent where it meets with the furnace*
- Replace MICA
- Replace combustion hose
- Add alcohol to the propane bottles*
- Replace gaskets
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LAZY FLAME (yellow)
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CONDITION
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SOLUTION
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High gas pressure
Low voltage
Air leakage at gaskets
Combustion wheel installed backwards or loose
Burner out of adjustment
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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
- Adjust burner according to furnace specification
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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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INSUFFICIENT HEAT
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CONDITION
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SOLUTION
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Furnace under fired specifications
Furnace limiting
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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*
- Check ducting and return air. It must comply with furnace's specifications*
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* indicates NOT covered under warranty
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