35
6. maintenance
6.4 Fault fi nding chart
A
PRELIMARY CHECKS
Make sure that:
PRESS THE ON/OFF BUTTON
DRAW OFF WATER
>
2.5 l/min
IS THE AIR º
PRESSURE SWITCH
IN OPEN CIRCUIT?
HAS THE FAN
STARTED TO RUN?
HAS THE
IGNITION SEQUENCE
BEGUN?
IS SPARK
GENERATION
NORMAL?
HAS THE
APPLIANCE SAFETY
SHUTDOWN BEEN
ACTIVATED?
IS THE BURNER
ALIGHT?
IS FAN
RUNNING
CONTINUOUSLY?
MOMENTARY
POWER TO
FAN?
1 - The mains water supply is turned on
2 - The gas is turned on
3 - The electrical supply is turned on
1 - Check/replace connection cable
2 - Check/replace the air pressure switch
3 - Check/replace the printed circuit board
1 - Check/replace connection cable
2 - Check/replace the printed
circuit board
1 - Check air pressure switch
2 - Check venturi & pipes
3 - Check fan efficiency
1 - Check ignition electrode cable
2 - Check/replace ignition electrode
3 - Check/replace the P.C.B.
1 - Check power supply of gas valve
2 - Check operation of gas valve
3 - Replace gas valve
4 - Check/replace the P.C.B.
1 - Check if flame strikes detection electrode
2 - Check/replace detection electrode
3 - Check/replace the P.C.B.
1 - Replace fan
