Atwood Mobile Products Water Heater Water Heater Exchanger User Manual

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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 800-825-4328 before proceeding.
CAUSE SOLUTION
WATER HEATER LOCK OUT - SPARK PRESENT BUT NO GAS
Gas pressure incorrect ------------------------------------------Set inlet pressure at a minimum 11˝ W.C. with two or more gas
appliances running
Low voltage--------------------------------------------------------Correct power supply - 10.5 VDC minimum
Blocked main burner tube --------------------------------------Clean burner tube
Blocked main burner orifice ------------------------------------Clean or replace orifice
Loose wires on E.C.O.--------------------------------------------Secure wire connections
Loose wire connections on solenoid valve --------------------Secure wire connections
Loose valve wire on wiring harness ----------------------------Repair wire on edge connector or replace wiring circuit board harness
Defective E.C.O. --------------------------------------------------Replace E.C.O.
Defective circuit board--------------------------------------------Replace circuit board
Defective solenoid valve------------------------------------------Replace coils or solenoid valve
No gas to solenoid valve ----------------------------------------Correct gas supply
Dirty connector on circuit board --------------------------------Clean edge connector
WATER HEATER LOCK OUT - GAS PRESENT BUT NO SPARK
High tension lead wire loose ------------------------------------Secure wire connection on circuit board
Electrodes loosely attached to main burner ------------------Secure electrodes to main burner
Improper electrode gapping ------------------------------------Re-position spark gap to 1/8˝ and into path of flame
Dirty electrodes --------------------------------------------------Clean electrodes
Wires loose in electrode porcelain------------------------------Replace electrodes
Cracked porcelain on electrode----------------------------------Replace electrodes
Defective circuit board--------------------------------------------Replace circuit board
WATER HEATER LOCK OUT - GAS AND SPARK PRESENT
Gas pressure incorrect ------------------------------------------Set inlet pressure at a minimum 11˝ W.C. with two or more gas
appliances running
Low voltage--------------------------------------------------------Correct power supply - 10.5 VDC minimum
Poor electrical ground--------------------------------------------Secure electrical ground
Electrodes out of flame pattern --------------------------------Re-adjust electrodes
Electrodes sparking to screw fastening burner to flue tube Adjust electrodes away from screw
Dirty electrodes --------------------------------------------------Clean electrodes
Partial obstruction in main burner------------------------------Clean main burner
Partially obstructed main burner orifice------------------------Clean main burner orifice or replace
Improper air adjustment ----------------------------------------Adjust main burner air shutter approximately 1/4 open
Flame spreader on main burner out of adjustment ----------Adjust flame spreader so that it is square to the end burner tube out
of alignment of the main burner
Manifold not aligned with main burner ------------------------Re-align solenoid valve with main burner
Partially opening solenoid valve --------------------------------Replace solenoid valve
Defective circuit board--------------------------------------------Replace circuit board
Electronic Ignition Water Heater
TROUBLE SHOOTING GUIDE
Effective: 5/26/98
continued

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