Worcester C1 User Manual

37
Remove multiway
connector from board
position ST16. Test
resistance across
contacts 17 and 18
(yellow wires). Is it
between 1 kohm and
30 kohm?
Test resistance across
contacts 12 and 13
(red wires). Is it
between 1 kohm and
30 kohm?
Test resistance across
contacts 7 and 8
(brown wires) and 9
and 10 (violet wires).
Are both readings
below 200 ohms?
Replace control board.
(Section 15.4.10).
Replace gas valve.
(Section 15.4.1).
Remove both brown
connectors from
gas valve.
Is there continuity
from brown and violet
wires to the multiway
connector?
Check or replace CH
sensor.
(Section 15.4.15).
Is there continuity
from contacts 17 and
18 to DHW sensor?
Check or replace
DHW sensor.
(Section 15.4.17).
Is there continuity
from contacts 12 and
13 to CH sensor?
Repair or replace
harness.
Repair or replace
harness.
Repair or replace
harness.
Is the multiway
connector at board
position ST16 pushed
fully home on to the
board?
Push fully home
FAIL POINT I “Sensor Fault”
No
No
No
No
No
No
No
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Check the DHW
sensor. Is it correctly
fitted onto the pipe
with heat conductive
paste between the
pipe and sensor?
Yes
No
Re-fix sensor onto pipe

Worcester C1 Specifications

General

Brand	Worcester
Model	C1
Category	Boiler
Language	English