For Service Technicians
START BOILER
IF PILOT BURNER LIGHTS
IF PILOT BURNER
BUT MAIN BURNERS DO NOT
DOES NOT LIGHT
CHECK FOR 24 V
CHECK THERMOCOUPLE
AT GAS VALVE
IF NOT 24 V:
IF 24 V:
IF O.K.
IF DEFECTIVE
CHECK TRANSFORMER OUPUT
REPLACE
FOR 24 V
GAS VALVE
REPLACE
REPLACE
GAS VALVE
THERMOCOUPLE
IF NO
IF 24 V:
24V:
REPLACE
PROBLEM IN
TRANSFORMER
LIMIT
CIRCUITS
WARNING
HIGH VOLTAGE
For Qulified Techinicians ONLY
ELECTRICAL
STANDING PILOT
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