Rinnai REU-VR3237WG Service Manual page 30

11. Hot Water Outlet Thermistor Circuit (G
Check Hot Water Thermistor if error code 32 is displayed.
Disconnect relay connector (G
When disconnected: resistance >1M
When short circuit: resitance > 1
Normal: Check Heat exchanger outlet thermistor
Faulty: Replace hot water outlet thermistor.
Refer circuit diagram diagnostic points for normal temperature versus resistant values.
If normal proceed to Flame Rod circuit.
Faulty: Replace the Hot water Outlet Thermistor.
Note: For controller readout of thermistor temperature whilst operational refer
maintenance monitor (chapter 17) No. 2.
Refer circuit diagram diagnostic points for normal temperature versus resistant values.
12. Surge Protector (D
a) Check the electrical fuses between D
If blown, replace with fues of correct rating (240V, 3A). If OK go to b).
b) Check supply voltage at D
If supply voltage incorrect check power supply to appliance. If OK go to c).
c) Check voltage at D
zero repeat a). If fuses are OK replace surge protector.
13. Bypass Servo Circuit (H
a.) Measure working voltage while relay connector (H
Normal:
CN Wire Colour
Br - W
B O - W
1
Y - W
GND
R - W
Faulty: Replace PCB.
b.) Disconnect relay connector (H
Normal:
CN Wire Colour
Br - W
B O - W
1
Y - W
GND
R - W
If normal, proceed to a).
Faulty: Replace Bypass Servo.
Infinity REU-VRM3237WG / HD250e REU-VRM3237WC
)
5
) and measure resistance White -Pink.
5


) and electric fuses
1
and D
3
. Voltage between white and black wires 207-264V. 
1
. Voltage between white and black wires 207-264V. If voltage is
2
)
1
Value
DC 2~6V
) and measure resistance.
1
Value

15~35
- 25 -
. Normal resistance across fuse < 1
2
) is connected.
1


. 
Issue 1 - 19/05/09 ©Rinnai