Rinnai Continuum Series - Water Temperature Thermistor Check Procedure

REU-2532FFU Series 44 Rinnai
Unable to adjust hot water temperature
1) Is the water temperature thermistor operating normally ?
a. # Disconnect the connector B
5,
and measure the
resistance between the white wires, see below
for resistance readings.
Thermistor resistance valves:
59 ºF = 11.4 ~ 14 KΩ
86 ºF = 6.4 ~ 7.8 KΩ
113 ºF = 3.6 ~ 4.5 KΩ
140 ºF = 2.2 ~ 2.7 KΩ
221 ºF = 0.6 ~ 0.8 Ω
Normal: Proceed to check item 2 below.
Faulty: Replace the water temperature
thermistor.
2) Is the change over solenoid (SV1) normal ?
a. # Disconnect the changeover solenoid (SV1)
connector, and measure resistance at the
solenoid terminals.
Normal: 1.7 ~ 2.1 KΩ
If normal, proceed to b.
Faulty: Replace the changeover solenoid (SV1).
b. Measure the voltage at the changeover solenoid
(SV1) yellow ~ black wires.
Normal: 80 ~ 100 VDC
If normal, proceed to check item 3, on next
page.
Faulty: Replace the PCB unit.