22
Servicing should only be performed by a Qualified Service Technician
7. FLAME SENSOR ERROR
CHANGE
BACK
ADVANCED
Flame Sensor (error)
Fault occurred 1 mins ago
Flame Sensor rod detected flame
when gas valve should be off.
Shut off gas until repaired.
Press the Advanced button for
(press [DOWN] for more....)
CAUSES:
•
The Flame Sensor has detected flame when the
Gas Control Valve is supposed to be off.
CHECK/ REPAIR:
•
Look through sight glass. If flame is present, shut the main gas supply off. See Gas Control Valve section
below to confirm proper operation.
•
If flame is not present, cycle the unit Off by turning the Enable/Disable switch to Disable, wait for 5 seconds,
and cycle the unit On by turning the Enable/Disable switch to Enable to see if the error clears. See "Flame
Sensor" section on Page 24 thru Page 25.
GAS CONTROL VALVE
The 24 Volt Gas Control Valve on these water heaters is DC voltage valve. The CCB sends 24 VAC to the
valve and the AC voltage is rectified into a DC voltage by electronics contained inside the plug end of the 24
Volt Gas Control valve wiring harness, see Figures below.
GAS CONTROL VALVE ASSEMBLY: BTH 120 - 250 MODELS
VENTURI
LOW GAS
PRESSURE SWITCH
SUPPLY GAS
CONNECTION
GAS CONTROL
VALVE
COMBUSTION
AIR INLET
24 VAC SOLENOID
& WIRE HARNESS
