General Service Chart - State Water Heaters SBD71120 Service Handbook

GENERAL SERVICE CHART

Condition
DAMPER OPENS NO POWER
TO IID MODULE
PILOT LIGHTS, SPARKS
CONTINUOUSLY
HEATER WILL NOT IGNITE
WEEPING TEMPERATURE
AND PRESSURE RELIEF VALVE
LARGE VOLUME WATER
RELIEF FROM T&P VALVE
PREMATURE TANK
LEAKAGE
DAMPER WILL NOT OPEN
NO SPARK AT PILOT -
DAMPER FULLY OPEN
• DAMPER NOT FULLY OPEN
• DEFECTIVE PROTECTOR
SWITCH
PILOT FLAME NOT PROVING
NOT PROVING
EXISTENCE
PILOT GAS NOT COMPLETELY
INTERRUPTED AT END OF
HEATING CYCLE
• THERMAL EXPANSION
• FAULTY VALVE
• EXCESSIVE WATER
• TEMPERATURE
• FAULTY RELIEF VALVE
CONDENSATION
CONTAMINATED AIR
WATER HAMMER
THERMAL EXPANSION
DEPLETED ANODES
BINDING SHAFT
DAMPER MOTOR
DAMPER ASSEMBLY
IID MODULE
SPARK CABLE
Servicing should only be performed by a Qualified Service Technician
Cause
SEE FLAME RECTIFICATION - STEP
8.
PILOT FLAME INTERRUPT 120 VAC POWER.
ADD THERMAL EXPANSION TANK.
REPLACE RELIEF VALVE.
CHECK WIRING REPLACE DUAL
CONTROLLER.
REPLACE RELIEF VALVE.
ADD THERMAL EXPANSION TANK.
SCHEDULE ANODE
REPLACE AS NEEDED.
SUPPORT VENTING
SEE STEP 7. Services Switch may
bypass problem until replacement
part is received.
REPLACE DAMPER .
REPLACE IID STEP 6.
REPLACE CABLE STEP 7.
Solution
• REPLACE DAMPER.
• REPLACE PC BOARD.
• CHECK GROUND WIRE
ATTACHMENT.
• CLEAN OR REPLACE PILOT
ASSEMBLY.
• CHECK SUPPLY GAS
PRESSURE.
• REPLACE GAS VALVE.
• INCREASE STORED WATER
TEMPERATURE AND
CONFIRM PROPERLY SIZED
APPLICATION.
• REMOVE CONTAMINANTS.
• SUPPLY CLEAN COMBUSTION
AIR.
• ADD WATER HAMMER
ARRESTOR.
• REDUCE WATER PRESSURE.
• REMOVE UNNECESSARY
CHECK VALVES.
CHECKS
• REPLACE DAMPER.
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