17
FAULT FINDING TEST ‘1’
NO
MAINS
ON FAN
REPLACE FAN
YES
NO
YES
A
CHECK &/OR
REPLACE
WIRING AND
CONNECTIONS
FAN
RUNNING
START
REPLACE
DRIVER BOARD
NO
NO
YES
SWITCH ON WATER
HEATER AND SELECT
WATER TEMPERATURE
AT MAX.
TURN ON TAP WITH
A FLOW RATE >
THAN 2.5 LIT/MIN
MAINS
PRESENT BETWEEN
TERMINALS 8 & 9
ON ACF
MAINS
PRESENT BETWEEN
TERMINALS 10 & 11
ON ACF
MAINS
PRESENT
BETWEEN TERMINALS
X1.5 & X1.6 ON
DRIVER
BOARD
CHECK &/OR
REPLACE
WIRING AND
CONNECTIONS
MAINS
PRESENT
BETWEEN TERMINALS
X1.1 & X1.8 ON
DRIVER
BOARD
YES
MAINS
PRESENT
BETWEEN TERMINALS
X1.1 & X1.9 ON
DRIVER
BOARD
CHECK WIRING AND
CONNECTIONS OR
SAFETY THERMOSTAT
MAINS
PRESENT
BETWEEN TERMINALS
X1.1 & X1.2 ON
DRIVER
BOARD
NO
REPLACE
DRIVER BOARD
FUSES OK
CHECK FUSES
F1 & F2 ON
DRIVER BOARD
RESTART THE
TEST
REPLACE FUSES
YES
YES
CHECK &/OR REPALCE
FUSE F3, MAIN SWITCH AND
SUPPLY & CONNECTORS
TO BOILER TERMINALS
CHECK WIRING
BETWEEN MAIN
SWITCH AND DRIVER
BOARD
NO
LINE
LAMP
LIGHT?
MAINS
PRESENT BETWEEN
TERMINALS 7 & 11
ON ACF
A1
MAINS
PRESENT BETWEEN
TERMINALS 4 & 11
ON ACF
REPLACE ACF
BOARD
MAINS
PRESENT
BETWEEN TERMINALS
X1.1 & X1.2 ON
DRIVER
BOARD
CHECK &/OR
REPLACE
WIRING AND
CONNECTIONS
YES
CHECK &/OR REPALCE
FUSE F3 MAIN SWITCH
AND SUPPLY &
CONNECTORS TO
BOILER TERMINALS
CHECK WIRING
BETWEEN MAIN
SWITCH AND
DRIVER BOARD
LINE
LAMP
LIGHT?
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
