Rinnai Infinity 24e Reference

21. Fault Diagnosis

Before carrying out checks marked #, remove power cord from wall plug.
Wiring diagram is o n pag e 35.

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

1) Is the fuse blown?

Check fuse

a. Remove 240V plug from socket.
b. # Measure resistance to check the electric

Fuses are located in plastic holders in

the main harness, on the lower right

hand side of the appliance

fuse (3A).

Normal: less than 1

If normal, proceed to check item 2) below.

Faulty: Replace fuse (5A)

If it blows again, investigate cause of short
circuit.

Ω

2) Is the main transformer normal?

Check the transformer.

a. Measure the voltage in between the red

wires of the relay connector (A

Normal: AC90 ~ 110 V / 15 ~ 21

If normal, check 2 below.

Faulty: Check for AC 90 ~ 110 V on the

PCB terminal J

black ~ black

b. Check voltages below at upper PCB

connector A.

Normal: orange -orange

AC 13 ~ 30V / 1.4 ~ 1.8
brown - grey
AC 30 ~ 50V / 6 ~10
yellow - grey
AC 180 ~ 220V / 0.4 ~ 0.6
If normal, check 3 at top of next page.

Faulty: Replace the transformer.

Ω

Ω

Ω

).

1

Ω

E

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c. Check the voltage at centre PCB connector

F, green~green.

Refer to diagram on

bottom of previous page.

3) Is the remote control normal?

Normal: AC 16 ~ 20V

If normal, check item 3) below.

Faulty: Replace the transformer.
Note: Transformer voltage above applies

to the appliance in a standby, non­functioning state.

Check voltage between the two remote
control cable conductors.

a. Check the voltage between terminals on

the remote control terminal mount (H

Normal: DC 10 ~ 13V

If normal, check for open circuit or
shorts before replacing the remote
control.

Faulty: Replace PCB.

).

1

No combustion (despite remote control indication)

1) Is the water flow sensor normal?

a. Measure the voltage between red and

black of the relay connector (a

).

2

Normal: DC 11 ~ 13V

If normal, go to (b).

Faulty: Replace water flow control.

b. Measure the voltage between yellow and

black of the relay connector (a

)

2

Normal: DC 2 ~ 10V

If normal, go to 2).

Faulty: Replace the water flow sensor.

E

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2) Is the flame rod normal? Error “72” is displayed

Checking the flame rod.

3) Is the water temperature thermistor normal?

a. # Detach the flame rod terminal A

re-attempt operation.

(“72” is displayed)

Proceed to check item 3) below.

(“72” is not displayed)

Inspect for electrical current leak from
the flame rod.

Measure resistance between flame rod

terminal A

Normal: 1 M or more

and the appliance earth.

2

Ω

If normal, replace the PCB unit.

Faulty: Replace the flame rod.

, and

2

If error “32” is displayed, check the water
temperature thermistor.

a. # Disconnect connector C

, and measure

1

the resistance of white and white.

Resistance > 1M = open circuit.

Resistance < below 1 = short circuit.

Ω

Ω

Normal: proceed to check item 4.) on next

page.

Faulty: replace the water temperature

thermistor.

E

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