44
Boiler is running in
“Autofrost stat” mode.
See Section 17.
Replace control board.
Note:
A damp board
could cause this fault.
Is the boiler in a very
cold environment (less
than 5°C)?
TEST G
No
Yes
Is the CH limit
potentiometer
(concealed behind
facia bottom panel)
set to maximum?
Does the problem
occur in CH mode
only?
Water flow
temperature very low
(with all knobs set at
maximum).
TEST I
No
Yes
It is not possible to
easily isolate the fault.
The most likely causes
are control board (fail),
heat exchanger
(blocked) or
gas valve (sticking).
Hot water
temperature always
too hot during a
demand (not
regulating).
TEST H
Hot water sensor
could be off or poorly
fixed to pipe.
Repair or replace.
Yes
Problem occurs in the
HW mode only.
Check flow sensor:
with boiler cool,
slowly open a HW tap.
Does the boiler ignite
with a flow of about
3 l/min?
(Check using a
measuring jug and
stop watch i.e 500ml
in 10 sec.
Yes
No
Turbine sticking or
seized.
Replace the turbine.
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