Worcester C1 User Manual

35
Boiler is running in
“Autofrost stat” mode.
See Section 17.
Replace control board.
(Section 15.4.10).
Note: A damp board
could cause this fault.
Is the boiler in a very
cold environment (less
than 5°C)?
FAIL POINT F
No
Yes
Is the boiler fully
water pressurised and
is all air vented?
Rectify fault.
FAIL POINT G “Primary Overheat”
No
Re-fix sensor to pipe.
No
No
Repair or replace
pump.
(Section 15.4.18).
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
Remove the multiway
connector from board
position ST16.
Is there a short circuit
across contacts 5 & 6?
Fault caused by control
board or heat
exchanger
Replace overheat
thermostat or check
wiring to it
Yes
Yes

Worcester C1 Specifications

General

Brand	Worcester
Model	C1
Category	Boiler
Language	English