Electrical Component Analysis - Rinnai ENERGYSAVER RHFE-308FTR Service Manual

21. Electrical Component Analysis

* Before starting inspection, check wiring harness and double check that all connectors are tight.
* Before carrying out checks marked
Nature of Examination
Fault
A. "12:00" fails to 1) Is the voltage
flash when power correct?
cord is pugged in,
and temperature
((2) Blown or
is not displayed
defective fuse?
w h e n u n i t i s
turned on (normal
sequence can not
proceed).
(3) Is the transformer
OK?
Energysaver RHFE-308 FTR
∗
, remove power cord from wall socket.
Diagnostic
Point Point
Check electric socket
and voltage.
1. Measure fuse
resistance.
*
2. Measure convection
motor coil resistance
after removing 2P conn-
ector.
*
3. Measure combus-
tion motor coil resist-
ance after removing 4
connector.
*
4. Measure resistance
o f tran sfor m er after
removing 8P connector.
*
5. Remove solenoid
valve lead wires (SV
SV ) and measure coil
2
r e si s t a n c e b e t w ee n
terminals.
*
6. Remove modulat-
ing valve lead wire(s)
(POV) and measure coil
resistance between
terminals.
Check transformer
secondary voltage.
Values
AC 230 - 240 V
< 1 Ω
(D) Grey - Pink
90 - 180 Ω
(G) Red - Black
> 1 M Ω
(E) White - White
5-20 Ω.
(E) Red - Red
1 - 8 Ω.
(E) Black - Blue
0.5 - 3Ω
(E) Blue - Yellow
250-450 Ω.
(F) Black - Yel-
low
,
1
SV 1.3-2.2KΩ.
1
SV 1.3-2.2KΩ.
2
(H) Grey - Grey
80 - 100 Ω
(E) Red - Red
AC 24 - 41V
(E) Black-Yellow
AC 10 -17V
(E) Blue-Yellow
AC 130 - 180 V
- 36 -
Y/N Action
Yes Go to (2).
No Repair electric source.
Yes Go to (3).
No Replace fuse.
Go to (2) - 2.
Yes Go to (2) - 3.
No Replace convection
motor.
Yes Go to (2) - 4.
No Replace combustion
motor.
Yes Go to (2) - 5.
No Replace transformer.
Yes Go to (2) - 6.
No R e p l a c e s o l e n o i d
valve.
Yes Replace PCB.
No Replace modulating
valve.
Yes Replace PCB.
No Replace transformer.
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