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11.Water Flow Servo Circuit
a.) Disconnect relay connector (E
PCB unit side (while operating).
Normal: DC10-13V
If normal: proceed to c.).
Faulty: Replace PCB unit.
b.) Measure voltage between Black and Yellow with relay connector (E
flowing, water flow servo fully open).
Normal: DC4~7V (Pulse 20~320Hz)
Faulty: Replace Water Flow Servo with Water Flow Sensor.
c.)
Measure voltage between Yellow and Grey with relay connector (E
flowing, water flow servo fully open).
Normal: DC4~7V
Faulty: Replace Water Flow Servo and Water Flow Sensor.
12.Hot Water Outlet Thermistor Circuit
Check Hot Water Thermistor if error code "32" is displayed.
Disconnect relay connector (E
When disconnected: >1M
When short circuit: > 1
Normal: Check Heat exchanger outlet thermistor
Faulty: Replace hot water outlet thermistor.
Normal
Temperature
voltage
If normal proceed to 8. Flame Rod circuit.
Faulty: Replace the Hot water Outlet Thermistor.
Note: For controller readout of thermistor temperature whilst operational refer maintenance
monitor.
Disconnect relay connector (E
13.Surge Protector (F
Check the fuse. Blue-Brown
AC207~264V
a.) Unplug the power plug.
b.) Check whether or not the fuse (3A) x 2 has blown by measuring the resistance.
Normal: <1
If normal go to step 14. Electrical Fuse
Faulty: Replace fuse/s (3Ax2). Check for a short next time it's turned off.
REU-K2430WG-AK (Envirosmart
)
REU-K2430WG-AK
), and measure voltage between Red (+) and Black (-) on
5
) or (E
) and measure resistance White -White.
4
3
o
o
15
C
30
C
k
6.4~7.8 k
) and measure voltage White -White.
4
)
1
2
5
o
45
C
3.6~4.5 k
2.2~2.7 k
- 24 -
) connected (with no water
) connected (with no water
o
o
60
C
105
C
0.6~0.8 k
Issue 1 - 16/12/09 ©Rinnai
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