Rinnai RUC80i Training Program page 55

Electrical Diagnostics:
1. Measure incoming voltage at receptacle, should be 120 volts AC.
2. Check at connector "F" on PC board across black
wire pin #3 and white wire pin #1.
3. Verify fuse is not blown.
4. Measure continuity of safety circuit starting at
connector "B" pin #1 white wire & connector "G" pin
#8 red wire.
5. Measure resistance of gas solenoids valve SV1 on connector "B"
black wire pin #4 and blue wire pin #6. Resistance
reading should be between 35 ~ 41 ohms.
6. Measure resistance of the modulating solenoid valve
(POV) on connector "D" across yellow wires on pins #1
and 2. Should have between 67 ~ 81 ohms.
7. Measure resistance of outgoing water thermistor on connector
"E" across white wires on pins #2 and 3.
59 ˚F = 11,4 ~ 14K ohms
86 ˚F = 6.4 ~ 7.8K ohms
113 ˚F = 3.6 ~ 4.5K ohms
140˚F = 2.2 ~ 2.7K ohms
221 ˚F = 0.6 ~ 0.8K ohms.
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PROPRIETARY and CONFIDENTIAL
Enhancing Lives By Changing The Way Water Is Heated
55
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D
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5/4/2018