Worcester 26CDi XTRA Installation And Servicing Instructions page 42

No
Is the boiler in a very
cold environment (less
than 5°C)?
Yes
Boiler is running in
"Autofrost stat" mode.
See Section 17.
No
Is the boiler fully
water pressurised and
is all air vented?
Yes
No
Reset the controls and
restart the boiler.
Does the pump run?
Yes
Remove inner casing
cover and inspect the
No
primary sensor (left of
heat exchanger).
Is it correctly fixed to
pipe?
Yes
Replace control board.
(Section 14.3.23)
Drop down the facia.
No
Is the gas valve mode
switch in the normal
position?
Yes
Replace control board.
(Section 14.3.23)
Note: A wet board
could cause this fault.
Rectify fault.
Repair or replace
pump.
(Section 14.3.14)
Re-fix sensor to pipe.
42
Turn to normal
position