Failure Of Gas Solenoid Valve - Noritz NR501-OD Service Manual

Error Codes
Display Remote
Window Controller

Failure of Gas Solenoid Valve

51, 511 51
(or Gas Solenoid Valve drive circuit abnormality)
Check whether each connector (for SV0~SV3) on
M a i n o f d l P a l e t n a d G s a V l a e v o c
Normal
Check the coil resistance* of each Gas Solenoid Valve.
(Which Gas So l n e o d i V l a e v h s a b a
Check for improper connection of wiring, damage.
Normal
* Coil resistance
SV0 : 20~35
SV1 : 35~65
SV2 : 35~65
SV3 : 35~65
When measuring the resistance,
disconnect the connector and
check the male side .
<Condition of occurrence for error code 51>
When the Unit is in following conditions, the error code is displayed.
m s e o u . t
- if the Gas Solenoid Valve's conections are improper.
- if the Gas Solenoid Valve's conections are damaged.
Abnormal
- Circuit Board failure.
n r o m l a y t i ) ?
Abnormal
SV0 abnormality
SV1 or SV2 or SV3
abnormality
45
Description
* It is not necessary to replace the
Displ ay Window Circuit Board.
Connect the connector.
Replace the Gas Valve.
Replace the Manifold Plate.
Replace the Circuit Board.