Ariston microCombi, Servicing Instructions

Page: 21 / 28

Supplied By www.heating spares.co Tel. 0161 620 6677
21
IS THE BURNER
ALIGHT?
POWER TO
GAS VALVE?
POWER
TO SPARK
GENERATOR?
YES YES
NO
YES
YES
NO
NO
NO
NO
YES
1 - Check/replace cable
2 - Check/replace P.C.B.
1 - Check/replace cable
2 - Check/replace P.C.B.
1 - Check if flame strikes
detection electrode
2 - Check soft-light gas
pressure
3 - Check/replace detection
electrode
4 - Check/replace P.C.B.
1 - Check/replace spark
generator
2 - Check/replace ignition
electrodes and cables
3 - Check spark gap
1 - Check gas supply pressures
2 - Check gas pressure to
burner
3 - Check spark gap
4 - Check/replace gas valve
IS THE
AIR PRESSURE SWITCH
ACTIVATED?
CHECK
∆
P ON AIR
PRESSURE TEST
POINT
HAS THE
BOILER SAFETY
SHUTDOWN BEEN
ACTIVATED?
1 - Check exhaust/air intake
2 - Check venturi & tubes
3 - Check fan efficiency/replace
1 - Check/replace A.P. switch
P
≥
0.55mbar
P 0.55mbar
∆
∆ ≤
YES
DOES
THE SPARK
SEQUENCE
START?
NO