32
Boiler is running in
“Autofrost stat” mode.
See Section 18.
Replace control board.
(Section 16.4.22).
Note:
A wet board
could cause this fault.
Is the boiler in a very
cold environment (less
than 5°C)?
Drop down the facia.
Is the gas valve mode
switch in the normal
position?
Turn to normal
position.
FAIL POINT F
No
No
Yes
Yes
Is the boiler fully
water pressurised and
is all air vented?
Rectify fault.
FAIL POINT G “Primary Ov
erhea
t”
No
Re-fix sensor to pipe.
No
Repair or replace
pump.
(Section 16.4.12).
No
Reset the controls and
restart the boiler.
Does the pump run?
Yes
Remove inner casing
cover and inspect the
primary sensor (left of
heat exchanger).
Is it correctly fixed to
pipe?
Yes
Fault caused by control
board or primary heat
exchanger.
Yes
Remove the multiway
connector from board
position ST16.
Is there a short circuit
across contacts 5& 6?
Yes
Replace overheat
thermostat or check
wiring to it.
No
Содержание 24CDi BF
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