FAULT FINDING
& DIAGRAMS
INSTALLATION & SERVICING INSTRUCTIONS
49
FAULT FINDING
6-720-611-730b (12.05)
FAULT FINDING
Check, repair/replace as necessary:
Transformer.
All connections to control board.
Otherwise replace control board.
Gas valve
Flame sense electrodes/cables
Moisture on control board.
Blocked condensate trap.
Otherwise replace control board.
Cables and connections to gas valve.
Condensate trap.
Flue (for blockages).
Otherwise replace control board.
Press reset button again.
Replace fuse S12.
Otherwise replace control board.
Demand signal from roomstat/CH timer
(or link fitted at ST4)
CH channel of facia mounted programmer (if fitted).
CH control knob position.
Flow turbine
Demand signal from DHW timer (or link fitted at ST 8).
DHW channel of facia mounted programmer (if fitted).
230V fuse (S11).
Transformer.
Otherwise replace control board.
Fan / fan harness.
Sensors not fixed or out of specification.
Gas pressure / blockage.
Water pressure / blockage.
C0
2
mix.
Flue blockage.
Spark electrodes / cables.
Gas valve.
Gas supply.
C0
2
mix.
Seals.
Display
Code:
F0
F7
FA
Fd
P1, P2,
P3, P1...
Fault description:
Internal error
Flame detected with no
demand.
Flame detected after gas.
Gas valve switched off.
Reset button pressed by
mistake
Please wait, initialisation in
progress
No central heating,
hot water OK
No hot water,
central heating OK
No functions
Poor performance / noises
Noisy Ignition
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