Rinnai B20 Service Manual download pdf (Page 37)

REU-2532W Series 37 Rinnai

22. Electrical Component Analysis

Before carrying out checks marked with a # sign, disconnect power supply.

Unit’s wiring diagram can be found on page 35.

Appliance fails to operate (even remote control fails to operate).

1) Is the fuse blown

Fuses are located in plastic

holders in the main harness,

on the lower right hand side

of the appliance.

Check fuse.

a. Disconnect unit from power supply.

b. # Measure resistance to check the electric fuse (3

amp)

Normal: less than 1Ω

If normal, proceed to check item 2 below.

Faulty: Replace 3 amp glass fuse. If the fuse

blows again, investigate cause of short

circuit.

2) Is the main transformer normal ?

Check the transformer.

a. Measure the voltage and/or resistance at

connector F, black ~ white wires.

Normal: 100 ~ 120 VAC

51 ~ 63 Ω resistance

Faulty: Check for 120 – 125 VAC at the surge

protector, blue ~ brown wires, connector

Resistance reading 51 ~ 63 Ω

If normal, check item 3 on next page.

Faulty: Replace the transformer.

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Rinnai B20 Service Manual Page 37