Technical data

44
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?
Replace control board.
(Section 14.3.23).
Check or replace CH
sensor.
(Section 14.3.12).
Is there continuity
from contacts 17 and
18 to DHW sensor?
Check or replace
DHW sensor.
(Section 14.3.13).
Is there continuity
from contacts 12 and
13 to CH sensor?
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
Yes
Yes
Yes
Yes
Yes