Rinnai B20 Manuel de service télécharger pdf (Page 50)

REU-2532W Series 50 Rinnai

Nature of Fault

Examination Point

Diagnostic

Values

Y/N

Action

Repair

N

o

.

Yes Go to C-1-2 1. Measure the voltage

between flame rod

terminal C

1

and

appliance ground.

5 ~ 150 VAC

No Replace PCB 32

Yes Go to C-2

1. Check flame rod

2. Check to ensure

flame rod bracket is not

loose.

Is it secure?

No Replace/rectify 33

Yes Check for other

causes of flame

failure.

34

C. Combustion

occurs, but flame

fails.

Error code “12”

Displayed on

digital monitor.

2. Check ground

wire.

Check for faulty ground

wire connections at

unit, receptacle, and

ground rod to home,

and for broken or

shorted wires.

Are connections OK?

No Replace or repair

grounding circuit

to unit.

35

Yes Go to D – 2 D. Cannot adjust

water temperature.

1. Check hot water

thermistor.

# Disconnect connector

B

5

and measure the

resistance between

white ~ white. See

diagnostic points on

page #34 for

temperature at various

resistance.

Resistance values

match table on page

#44.

No Replace water

temperature

thermistor.

36

Yes Go to D-2-2 1. # Disconnect

solenoid connector E

from PCB and measure

the resistance between

brown ~ black.

1.7 ~ 2.1K

Ω

No Replace (SV3) 37

Yes Go to D-3

2. Check

changeover

solenoid valve

(SV3)

2. Measure voltage

between brown ~ black

wire of the changeover

solenoid valve (SV3) at

connector E.

80 ~ 100VDC

No Replace PCB 38

Yes Go to D-3-2 1. #Disconnect

modulating valve at C

2

festoon terminal and

measure resistance at

solenoid terminals.

67 ~ 81

Ω

No Replace

modulating valve

39

Yes Go to D-3-3 2. Measure the voltage

between the two

harness terminals at C

2

.

2 ~ 15VDC

No Replace PCB 40

Yes Go to D-4

3. Check modulating

valve.

3. Check whether the

manifold pressure alters

when remote control

temperature is altered

between 96° ~ 140°F.

Does the manifold

pressure change?

No Replace

modulating valve

(POV)

41

Yes Go to D-4-2

4. Check water flow

servo

1. #Measure resistance

between red ~ blue

wires of the water flow

servo connector B

2

.

22 ~ 26

Ω

No Replace water

flow servo

sensor.

42

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