Atwood Mobile Products 94605 service manual Water Heater Lock OUT Spark Present but no GAS

Electronic Ignition Water Heater

TROUBLE SHOOTING GUIDE

Effective: 5/26/98

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.

CAUSESOLUTION

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

continued

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