Worcester 26CDi Xtra

42
Boiler is running in
“Autofrost stat” mode.
See Section 17.
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?
FAIL POINT F
No
Yes
Is the boiler fully
water pressurised and
is all air vented?
Rectify fault.
FAIL POINT G “Primary Overheat”
No
Repair or replace
pump.
(Section 14.3.14)
No
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
Replace control board.
(Section 14.3.23)
Note: A wet board
could cause this fault.
Yes
Turn to normal
position
No
Re-fix sensor to pipe.
Yes
Replace control board.
(Section 14.3.23)