20
FAULT FINDING TEST ‘4’
NO
END
DO
BURNER AND FAN
SWITCH
OFF
TURN OFF TAP
A3
YES
CHECK WIRING
AND CONNECTION
OR CONTROL
BOARD
REPLACE
WATER FLOW
SENSOR
IS
WATER FLOW
SENSOR
OK
YES
NO
MAINS
PRESENT BETWEEN
TERMINALS 5 & 11
ON ACF
REPLACE ACF
BOARD
MAINS
PRESENT BETWEEN
WHITE WIRE ON AIR FLOW
SWITCH AND PIN 11
ON ACF
CHECK &/OR
REPLACE
WIRING AND
CONNECTIONS
A1
YES
MAINS
PRESENT BETWEEN
RED WIRE ON AIR FLOW
SWITCH AND PIN 11
ON ACF
CHECK &/OR
REPLACE
WIRING AND
CONNECTIONS
IS AIR
FLOW SWITCH
CONTACT ON N.C.
POSITION
CHECK FLUE
GAS TUBE
CHECK &/OR
REPLACE AIR
FLOW SWITCH
THE
POLARITY OF FEEDING
IS INVERTED
INVERT THE
POLARITY OF
FEEDING
THE
FEEDING IS PHASE
PHASE
REPLACE ACF
BOARD
INSTALL PHASE
PHASE KIT
A2
YES
YES
YES
NO
NO
NO
NO
NO
NO
YES
YES
