Rinnai REU-2007W, Service Manual

Page: 47 / 69

Infinity REU-2007,2008,2408,2424 - 42 - ©Rinnai
Unable to adjust hot water temperature
1) Is the water temperature thermistor normal?
a. Disconnect the connector (C
1
) and
measure the resistance between white
wires.
See diagnostic points, for temperature at
various resistance.
Normal: Proceed to check item 2) below
Faulty: Replace water temperature
thermistor.
2) Is the changeover solenoid valve (SV
3
) normal?
a. # Disconnect the changeover solenoid
valve (SV
3
) connector, and measure the
resistance between the solenoid terminals.
Normal: 1.3 ~ 1.9 k .
If normal, go to (b).
Faulty: Replace the changeover
solenoid valve (SV
3
).
b. Measure the voltage at the changeover
solenoid (SV3) blue ~ black connector.
Normal: DC 80 ~ 100V
If normal, go to item 3) on the next page.
Faulty: Replace the PCB unit.
Ω