REU-V1616W/REU-V2018W/REU-V2020W - 30 - Issue 1 - 10/10/03 ©Rinnai
17. Remote Control
Check the voltage between the 2-core remote control cable.
Measure the voltage between terminals on the remote control terminal (D).
Normal: DC 11~13V
If normal, replace the remote control after confirming that the cable hasn’t been
damaged or shorted.
Faulty: Because normal voltage is not given due a short circuit, despite the PCB being in
normal state, check Water Flow Servo circuit.
If solution is not given from the above replace PCB.
18. Anti-frost Heater Circuit
a.) Disconnect relay connectors ( F
4
) and (F
5
) and measure resistance between Yellow and Yellow
on heater side (water flow servo and HW connection).
Normal: 53Ω
If normal, proceed to b.).
Faulty: Replace Valve Heater.
b.) Disconnect relay connector (F
4
) and (F
5
) and measure resistance between Yellow and Yellow on
each connector on heater side.
Normal: 618Ω
If normal, proceed to c.).
Faulty: Replace Anti-frost Heater.
19. Frost Sensing Switch
a.) Disconnect relay connector (F
4
) and measure resistance between Blue and Blue.
Normal: < 1Ω
If normal, check wiring (AC240V circuit).
Faulty: Replace Frost Sensing Switch.
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