No Error Code; The Operation Indicator Does Not Light When The On/Off Button Is Pressed - Noritz WHiC56 Service Manual

1. No Error Code

1-1. The operation indicator does not light when the ON/OFF button is pressed.

Check the power outlet voltage.
YES
AC198 - 242V
or
AC207 - 253V
or
AC216 - 264V
Beware of electric shock due to
short-circuiting of the 240V circuit.
Check the lightning protection's secondary side voltage.
Normal
AC198 - 242V
or
AC207 - 253V
or
AC216 - 264V
Check the supply voltage of the power circuit board.
Normal
CN92 : Between White 1 - Black 3
AC108 - 132V
B
NO
Check the activation of the indoor
distribution board breaker.
Normal (Not activated)
Abnormal
Check the current lightning protection's primary side voltage.
Normal (AC198 - 242V or AC207 - 253V or AC216 - 264V)
Abnormal
Check the transformer's primary side voltage.
Normal (AC198 - 242V or AC207 - 253V or AC216 - 264V)
Check the transformer's secondary side voltage.
Normal (AC108-132V)
Check for improper connection of relay
wiring (from transformer to PCB ).
Check for relay wiring damage.
Abnormal (Activated)
Abnormal
3 BK
2
1
W
<CN92>
Abnormal
Lightning protection
Power cord
To anti-frost heater
Abnormal
Lightning protection
Power cord
To anti-frost heater
- 24 -
Turn the breaker on.
* If activated again, eliminate
the cause for activation.
Consult power company.
Check for power cord damage.
Replace the lightning protection.
Circuit Board
4 3 2 1
POWER
R BL G
<CN102>
CIRCUIT
BOARD
<CN104>
7
6
5
4
3
2
1
<CN103>
<FUSE 10A>
Check for improper connection of relay
wiring (from lightning protection
to transformer).
Check for relay wiring damage.
Transformer
Relay wiring Relay wiring
Check point
Replace the transformer.
Transformer
Relay wiring Relay wiring
Check point
7
6 W
5 Y
4
3
2 W
1 O
4 BR
3 Y
2 BL
1 R
<CN27>
3 BK
2
1 W
<CN92>
To PCB
To PCB