REU-VR2626WB (B26) /REU-VR2426WS (S26) /REU-VRM2626WG (INF26)
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Issue 3 - 13/11/14 ©Rinnai
11. Water Flow Control Device Circuit
a)
Disconnect relay connector (
E
5
), and measure voltage between Red (+) and Black (-) on PCB
unit side (while operating).
Normal:
11-13VDC
If normal: proceed to
b.).
Faulty:
Replace PCB unit.
b)
Measure resistance between Yellow and Grey with relay connector (
E
5
) connected (with no
water flowing water flow servo fully open).
Normal:
4~6VDC
Faulty:
Replace Water Flow Servo. If normal proceed to
c).
c)
Measure voltage between Brown and Grey with relay connector (
G
1
) connected. (Water flow
sensor fully closed).
Normal:
4~6VDC
Faulty:
Replace Water Flow Servo.
11. Thermistor Circuit
Check Thermistor if error code “32” is displayed.
Disconnect relay connector (
E
4
) and/or (
E
3
) and measure resistance White -White.
When disconnected
: resistance >1M
When short circuit:
resistance < 1
Operating:
Check Heat exchanger outlet thermistor
Resistance matches table below.
Faulty:
Replace hot water outlet thermistor.
If normal proceed to Flame Rod circuit.
Faulty:
Replace Thermistor.
Note:
For controller readout of thermistor temperature whilst operational refer maintenance monitor.
12. Surge Protector (F
3
)
a)
Check the electrical fuses between
F
2
and
F
3
. Normal resistance across fuse < 1
If blown,
replace with fuses of the correct rating (240V, 3A). If okay, go to
b).
b)
Check supply voltage at
F
2
. Voltage between blue and brown wires 207 - 264 V. If supply
voltage incorrect check power supply to appliance. If okay go to
c).
c)
Check voltage at
F
1
. Voltage between blue and brown wires 207 - 264V.
If voltage is zero repeat
a).
If fuses are okay replace Surge Protector.
13. Anti-frost Heater Circuit
a)
Disconnect relay connectors (
F
5
) and measure resistance between yellow wires on the inlet
valve frost heater at the frost heater side.
Normal:
53
If normal, proceed to b).
Faulty:
Replace Valve Heater.
b)
Disconnect relay connector (
F
6
) and measure resistance between the yellow wires on the pipe
frost heater at the frost heat side.
Normal:
618
Faulty:
Replace Anti-frost Heater.
Normal
Temperature
15
o
C
30
o
C
45
o
C
60
o
C
105
o
C
Resistance
k
6.4~7.8 k
3.6~4.5 k
2.2~2.7 k
0.6~0.8 k
