Rinnai INFINITY REU-3203W Service Manual page 41

18.Frost Sensing Switch.
Infinity REU-3203W
c.)
Disconnect relay connector ( J1) and ( J3)
and measure resistance between Yellow
and Yellow on Heat Exchanger Heater
side.
Ω
Normal: 825
If normal, proceed to Frost Sensing
Switch 18.
Faulty: Replace Anti-frost Heater A
(assy). [Measure when temperature is
o
4+/- 3 C.]
Note: If you cannot get the temperature
low enough, cool the low-temperature
sensing switch with ice etc.
a.)
Disconnect relay connector ( J
measure resistance between Blue and
Blue.
Ω
Normal: < 1
If normal, check wiring (AC240V cir-
cuit).
Faulty: Replace Frost Sensing Switch.
- 36 -
) and
2
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