Supplied By www.heating spares.co Tel. 0161 620 6677
30
7.12.7 FAULT FINDING TEST ‘4’
TEST 4
SPARK
YES
IGNITION
FAULT
AT ELECTRODE
FINISH
REPLACE
PCB
YES
NO
ARE
YES
NO
ELECTRODE
& LEAD OK
NO
AT GAS VALVE
24 VAC
YES
AT TERMINALS
24 VAC
11 & 12 OF
PLUG X2
CONTINUITY
CHECK
NO
REPLACE
PCB
DOES
BURNER
LIGHT
YES
NO
REPLACE &
RESTART TEST
DOES
BURNER
STAY LIT
YES
NO
NO
YES
IS IONISATION
VOLTAGE
ABOVE
2,0 Vdc
REPLACE
PCB
SILICONE PIPE &
NOZZLE, VALVE
CHECK: GAS
REGULATOR
SUPPLY,
OK?
REPLACE
YES
NO
GAS VALVE
RECTIFY &
RESTART TEST
IONISATION CHECK: Terminal 5 on plug X2 to Earth
ELECTRODE & LEAD,
CHECK:
SPARK GAP,
EARTH
CONNECTION
OK?
YES
NO
RECTIFY &
RESTART TEST
REPLACE
PCB