Worcester 26CDi Xtra

41
Red diode is
damaged. Replace
control board.
(Section 14.3.23)
Is there a link at
terminal ST13 pins 1
and 2?
Is there an electronic
programmer at
position ST5 at right-
hand end of board?
Replace control board.
(Section 14.3.23).
With CH control knob
fully clockwise, does
the boiler ignite and
appear to run
normally in central
heating mode?
Is there 230V AC
across terminal ST8
pins LR and N?
There is no heat
demand. Check room
thermostat or mains
programmer (or link).
Insert or tighten link
FAIL POINT D
No No
No
No
No
Yes
Yes
Remove programmer
connector from board
edge. Does CH lamp
now light?
Yes
Correctly set or
replace electronic
programmer.
Yes
Yes
Red diode is
damaged. Replace
control board.
(Section 14.3.23)
Replace control board.
(Section 14.3.23).
With a hot water tap
fully open, does the
boiler ignite and
appear to run
normally in hot water
mode?
Remove multiway
connector from board
position ST16. With
tap still open is there
continuity across
contacts 19 and 20
(2 pink wires)?
Remove the black cover
from the microswitch
assembly. With the tap
still open is there
continuity between the
two terminals
(C and NO)?
Visually observe if the
plunger on the diverter
valve assembly is pushing
the microswitch button
(Note: May be helpful if the
tap is repeatedly turned
on and off). If plunger
moves replace
microswitch (Section
14.3.18). If the plunger
does not move replace
water diverting valve.
(Section 14.3.19).
Repair or replace
wiring/harness
FAIL POINT E
No No
No
Yes Yes
Yes