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Nature of Fault
Examination Point
C. Combustion
1. Check flame rod
occurs, but flame
fails.
Error code "12"
Displayed on
digital monitor.
2. Check ground
wire.
D. Cannot adjust
1. Check hot water
water
thermistor.
temperature.
2. Check
changeover
solenoid valve
(SV3)
3. Check modulating
valve.
4. Check water flow
servo
REU-2532FFU Series
Diagnostic
1. Measure the voltage
between flame rod
terminal C
and
1
appliance ground.
2. Check to ensure
flame rod bracket is not
loose.
Check for faulty ground
wire connections at
unit, receptacle, and
ground rod to home,
and for broken or
shorted wires.
# Disconnect connector
B
and measure the
5
resistance between
white ~ white. See
diagnostic points on
page #34 for
temperature at various
resistance.
1. # Disconnect
solenoid connector E
from PCB and measure
the resistance between
brown ~ black.
2. Measure voltage
between brown ~ black
wire of the changeover
solenoid valve (SV3) at
connector E.
1. #Disconnect
modulating valve at C
2
festoon terminal and
measure resistance at
solenoid terminals.
2. Measure the voltage
between the two
harness terminals at C
.
2
3. Check whether the
manifold pressure alters
when remote control
temperature is altered
between 96° ~ 140°F.
1. #Measure resistance
between red ~ blue
wires of the water flow
servo connector B
.
2
50
Values
Y/N
5 ~ 150 VAC
Yes
No
Is it secure?
Yes
No
Are connections
Yes
OK?
No
Resistance
Yes
values match
No
table on page
#44.
Ω
Yes
1.7 ~ 2.1K
No
80 ~ 100VDC
Yes
No
Ω
Yes
2 ~ 15
No
0.5 ~ 25VDC
Yes
No
Does the
Yes
manifold
No
pressure change?
Ω
22 ~ 26
Yes
No
Action
Repair
o
N
.
Go to C-1-2
Replace PCB
32
Go to C-2
Replace/rectify
33
Check for other
34
causes of flame
failure.
Replace or repair
35
grounding circuit
to unit.
Go to D – 2
Replace water
36
temperature
thermistor.
Go to D-2-2
Replace (SV3)
37
Go to D-3
Replace PCB
38
Go to D-3-2
Replace
39
modulating valve
Go to D-3-3
Replace PCB
40
Go to D-4
Replace
41
modulating valve
(POV)
Go to D-4-2
Replace water
42
flow servo
sensor.
Rinnai
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