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 F
ault”
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
Содержание 28Si
Страница 29: ...29 ...
Страница 56: ...TO REPLACE THE PROGRAMMER Follow the preceding instructions 3 Programmer connection Fig 1 ST5 ...
Страница 57: ...4 OFF TWICE ONCE ON ...