Rinnai B20 Service Manual download pdf (Page 46)

REU-2532W Series 46 Rinnai

Anti-frost heaters do not operate

1) Are the ceramic anti-frost heaters OK ?

a. # Disconnect connector F

, and measure the

resistance of the heater mounted in the water

flow control valve, these are white wires.

Disconnect connector F

and measure the

resistance of the heater in the outlet line

connector See connectors in the first and second

picture to the left.

Normal: 348 ~ 375 Ω

If normal, proceed to b.

Faulty: Replace defective element.

b. # Take an ohm meter and read resistance across the

heater on the face of the heat exchanger. The

resistance across this element is listed below. See

third picture to the left for location of this element.

These are white wires.

Normal: 100 ~ 110Ω

If normal, proceed to check item 2 below.

Faulty: Replace defective anti frost heater

assembly.

c. Check resistance of the two heat exchanger

outlet line heater elements, as shown in the

third picture to the left. Check across each heater

independently.

Normal: 33 ~ 39Ω

Faulty: Replace defective anti frost heater

assembly.

2) Is the frost sensor switch operating normally ?

a. # Disconnect connector F

, and measure the

resistance through this switch, measure when

atmospheric temperature is 39 ºF + or – 3 ºF.

See drawing to left for location of this sensor,

these are blue wires to this switch.

Normal: Less than 1Ω

If normal, check wiring harness for defects.

(100 volts AC)

Faulty: Replace the frost sensing sensor.

# If the atmospheric temperature is too high,

cool the switch with ice.

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Rinnai B20 Service Manual Page 46

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