Flame Rod Does Not Detect Flame (Flame Fault Detection); Overheat Prevention Device (Thermal Fuse) Triggered - Noritz WHiC56 Service Manual

Error Code 12 Flame Rod does not detect flame
(Flame fault detection)
The trouble diagnosis for "Error Code 12" is same as "Error Code 11".
Error Code 14 Overheat Prevention Device (Thermal Fuse) triggered
Check the overheat prevention device (Thermal Fuse) resistance.
Normal
CN10
Between Black 1 - White 3
2 or less
When measuring the
resistance, disconnect the
connector and check the
Female side.
<The occurrence condition for error Code 12>
The message is displayed if no flame can be detected by the flame
rod during combustion.
Abnormal
1 BK
2
3 W
4
5 W
6 BL
7 BR
8 GY
9 BK
10
O
11
12 W
<CN10>
- 33 -
Circuit Board
<CN42>
MAIN
W 4 1 BK
CIRCUIT
5 2
<CN101>
6 3
BL 6 1 R
BOARD
R 7 2 BL
W 8 3 G
9 4 W
O 10 5 Y
1 BK
2
3 W
4
5 W
6 BL 1
7 BR 2
8 GY 3
9 BK 4
10 O 5
11 6
12 W 7
<CN10> <CN63>
Check for improper connection of wiring.
Check for the Primary Heat Exchanger is normal
(ex. The surface discolors black, clogging, etc.)
Replace the overheat prevention device (Thermal Fuse).
*If the Thermal Fuse is blown again, correct the cause.
<CN186>
1 R
2 BK
3 W
4 G
5 BL
6 BL
W 31 32
1 BL
R 29 30
2
V 27 28 BK
<CN78>
O 25 26 G
W 23 24 BK
21 22
19 20 V
BL 17 18 G
O 15 16 O
W 13 14 BL
W 11 12
W 9 10 Y
W 7 8 R
1 BL
W Y 5 6 Y
2 BL 1 2 3
W R 3 4 BK
3 BL BK
W 1 2 W
<CN38> <CN89> <CN197>
Replace the Circuit Board set.