Rinnai REU-2018W Service Manual page 42

19) Are the ceramic anti-frost heaters OK?
20) Is the frost sensing switch normal?
Infinity REU-2425W
Anti frost heater does not operate
- 39 -
ak. # Disconnect connector (J
measure the blue and blue
resistance on the water control
heater side.
Ω
Normal: 950~1050
(If normal, go to (al).
Faulty: Replace the water control heater.
al. # Disconnect connector (J
measure the resistance between
blue and blue on the heater
exchanger's heater side.
Ω
Normal: 135 ~ 175
If normal, go to item 2) below.
Faulty: Replace anti-frost heater (assy)
am. # Detach connector (J
measure the resistance between
blue and blue.
Measure at room temperature of 4±
°
3 C.*
Normal: Less than 1
if normal, check the wiring (AC100V
circuit)
Faulty: Replace the frost sensing switch.
* Where the low room temperature
cannot be achieved, please cool with
iced water or cold water below 4 C.
Issue 2 - 5/07/04 ©Rinnai
) and
3
) and
3
) and
2
Ω
°