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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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WATER HEATER LOCK OUT - SPARK PRESENT BUT NO GAS
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CONDITION
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SOLUTION
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Gas pressure incorrect
Low voltage
Blocked main burner tube
Blocked main burner orifice
Loose wires on E.C.O.
Loose wire connections on solenoid valve
Loose valve wire on wiring harness
Defective E.C.O.
Defective circuit board
Defective solenoid valve
No gas to solenoid valve
Dirty connector on circuit board
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- Set inlet pressure at a minimum 11" W.C. with two or more appliances running
- Correct power supply - 10.5 VDC minimum
- Clean burner tube
- Clean or replace orifice
- Secure wire connections
- Secure wire connections
- Repair wire on edge connector or repair wiring circuit board harness
- Replace E.C.O.
- Replace circuit board
- Replace coils or solenoid valve
- Correct gas supply
- Clean edge connector
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WATER HEATER LOCK OUT - GAS PRESENT BUT NO SPARK
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CONDITION
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SOLUTION
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High tension lead wire loose
Electrodes loosely attached to main burner
Improper electrode gapping
Dirty electrodes
Wires loose in electrode porcelain
Cracked porcelain on electrode
Defective circuit board
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- Secure wire connection on circuit board
- Secure electrodes to main burner
- Re-position spark gap to 1/8"
- Clean electrodes
- Replace electrode
- Replace electrodes
- Replace circuit board
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WATER HEATER LOCK OUT - GAS AND SPARK PRESENT
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CONDITION
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SOLUTION
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Gas pressure incorrect
Low voltage
Poor electrical ground
Electrodes out of flame pattern
Electrodes sparking to screw fastening burner
to flue tube
Dirty electrodes
Partial obstruction in main burner
Partially obstructed main burner orifice
Improper air adjustment
Flame spreader on main
Manifold no aligned with main burner
Partially opening solenoid valve
Defective circuit board
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- Set inlet pressure at a minimum 11: W.C. with two or more gas appliances running
- Correct power supply - 10.5 VDC minimum
- Secure electrical ground
- Re-adjust electrodes
- Adjust electrodes
- Clean electrodes
- Clean main burner
- Clean main burner orifice
- Adjust main burner air shutter approximately ¼ open or greater
- Adjust flame spreader so that it is square to the end burner tube out of alignment of the main burner
- Re-align solenoid valve with main burner
- Replace solenoid valve
- Replace circuit board
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EXCESSIVE OR INSUFFICIENT WATER TEMPERATURES
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CONDITION
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SOLUTION
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Bypass kit valves not set properly
Thermostat not seated against tank
Defective thermostat
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- Place valves in proper position
- Reseat thermostat
- Replace thermostat
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ERRATIC BURNER FLAME OR SOOTING
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CONDITION
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SOLUTION
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Low gas pressure
Poor gas supply
Improper air adjustment
Poor main burner alignment
Mis-aligned burner flame spreader
Blocked burner orifice
Obstructed main burner
Obstructed "U" tube
Obstructed exhaust grille
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- Set inlet pressure at a minimum 11" W.C. with two or more gas appliances running
- Replace gas supply
- Adjust main burner air shutter approximately ¼ way open - flame should be mainly blue and quiet
- Adjust valve and main burner alignment
- Align flame spreader so it is square with end of burner tube
- Clean orifice - DO NOT enlarge orifice
- Clean main burner
- Clean "U" tube
- Remove obstruction
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NO SPARK AND NO GAS
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CONDITION
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SOLUTION
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No voltage
Dirty edge connector on circuit board
Defective thermal cut-off
Defective ON/OFF switch
Defective circuit board
Defective thermostat
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- Correct power supply - minimum 10.5 VDC
- Clean edge connector
- Replace thermal cut-off
- Replace switch
- Replace circuit board
- Replace thermostat
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INTERMITTENT IGNITION - FAILS TO IGNITE
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CONDITION
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SOLUTION
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Cracked electrode ceramic
Chattering or fluctuating thermostat
Insulation on electrode wire cut or damaged
Ground screw at top of circuit board not tight
Loose ground wire on valve
Poor ground at electrodes
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- Replace spark electrode
- Replace thermostat
- Replace electrode
- Tighten ground screw - if stripped, replace with larger screw
- Tighten ground wire screw
- Loosen electrode attachment screw and retighten
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* not covered under warranty
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