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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4) Is the combustion fan normal?

Motor check
If error “61” is displayed, check
combustion fan.

a. Measure the voltage at the connector (D

black ~ red

Normal: DC 6~40V (fan on)

DC 0V (fan off)

If normal, go (b)

Faulty: Replace the PCB unit

Fan Revolution Sensor Check

b. Measure the voltage at connector D

1

black ~ yellow

Normal: DC11~13V

If normal, go (b) below

Faulty: Replace the PCB unit

c. Measure the voltage at connector D

1

black ~ white

Normal: DC2~9V

If normal, proceed to check item 5)

below

Faulty: Replace the combustion fan.

)

1

,

,

5) Is the sparker operating normally?

Checking the motor

a. Measure the voltage at connector I

grey ~ grey

Normal: DC 90 ~ 110 V

DC 0 V (when fan is OFF)

If normal, check (b) below.

Faulty: Replace the PCB unit

b. # Disconnect I

, and measure the

4

resistance between sparker terminals

Normal: >1M

Ω

If there is no spark, adjust or replace the

electrode.

Faulty: Replace the sparker.

.

4

E

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6) Is main gas so lenoid valve (SV1) normal?

If error “11” is displayed, check the main gas
solenoid valve.

a. # Disconnect the main gas solenoid valve

(SV

), connector and measure the

1

resistance at the solenoid terminals.

Normal: 0.9 ~ 1.3 k

Ω

If normal, check (b) below.

Faulty: Replace the main gas solenoid

valve.

b. Measure voltage main gas solenoid valve

(SV

) pink ~ black connector.

2

Normal: DC80~100V

If normal, proceed to check item 7) below.

Faulty: Replace the PCB unit.

7) Is the change over solenoid (SV

) operating normally?

2

8) Is the change over solenoid valve (SV

) normal?

3

If error “11” is displayed, check the change
over solenoid valve (SV

).

2

a. # Disconnect the main gas solenoid valve

(SV

) connector, and measure the

2

resistance at the solenoid terminals.

Normal: 1.3 ~ 1.9 k .

Ω

If normal, check (b) below.

Faulty: Replace the change over solenoid

valve (SV

).

2

b. Measure voltage at change over solenoid

valve (SV

) blue ~ black connector.

3

Normal: DC 80 ~ 100V

If normal, check item 9) below.

Faulty: Replace the PCB unit

a. # Disconnect the change over solenoid

valve (SV

) connector, and measure the

3

resistance at the solenoid terminals.

Normal: 1.3 ~ 1.9 k

Ω

If normal, check (b) below.

Faulty: Replace the change over solenoid

valve (SV

).

3

b. Measure the voltage at changeover

solenoid valve (SV

) blue ~ black

3

connector.

Normal: DC 80 ~ 100V

If normal, check item 9).

Faulty: Replace the PCB unit.

E

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9) Are the safety devices operating normally?

Check the thermal fuse.

Combustion stops due to flame failure

1) Is the flame rod functioning normally?

a. # Disconnect connector B

and measure

2

the resistance between red ~ red.

Normal: less than 1 .

Ω

If normal, replace the PCB unit.

Faulty: Check the appliance for damage.

If there is nothing abnormal, replace the

thermal fuse.

Check the remaining flame safety device.

b. Measure resistance between the two

terminals B

Normal: less than 1

.

3

Ω

If normal, replace the PCB unit.

Faulty: Replace the remaining flame safety

device.

a. Measure the voltage between the flame

rod terminal (A

) and the appliance earth.

2

Normal: AC 100 ~ 160V

If normal, check (b) below.

Faulty: Replace the PCB unit.

2) Is the earth lead wire normal?

b. Check that the flame rod attachment is not

loose.

Normal: Replace the PCB unit

Faulty: Secure the flame rod brackets.

a. Check whether the earth lead wire has

come loose (disconnection from round
terminal) or if any shorts have occurred.

If normal, check for any other causes for

flame failure (eg. gas valve is open,

blocked filter, etc)

Faulty: Secure the earth.

E

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Unable to adjust hot water temperature

1) Is the water temperature thermistor normal?

a. Disconnect the connector (C

) and

1

measure the resistance between white
wires.

See diagnostic points, for temperature at

various resistance.

Normal: Proceed to check item 2) below

Faulty: Replace water temperature

thermistor.

2) Is the changeover solenoid valve (SV

) normal?

3

a. # Disconnect the changeover solenoid

valve (SV

) connector, and measure the

3

resistance between the solenoid terminals.

Normal: 1.3 ~ 1.9 k .

Ω

If normal, go to (b).

Faulty: Replace the changeover

solenoid valve (SV

).

3

b. Measure the voltage at the changeover

solenoid (SV3) blue ~ black connector.

Normal: DC 80 ~ 100V

If normal, go to item 3) on the next page.

Faulty: Replace the PCB unit.

E

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3) Is the modulating valve operating normal?

a. # Disconnect the modulating valve festoon

terminals and measure the resistance at the
terminals.

Normal: 60 ~ 100

Ω

If normal, go to (b.

Faulty: Replace the modulating valve.

b. Re-connect terminal and measure the pink

~ pink voltage at the modulating valve
festoon terminal.

Normal: DC 0.5 ~ 25 V

If normal, go to (c) below.

Faulty: Replace PCB unit.

c. Investigate the change in gas secondary

pressure when the remote control preset
temperature is altered from 37 to 75C.

°

Normal: If the secondary pressure

changes, proceed to check item 4) below.

Faulty: Replace the modulating valve.

4) Is the water flow servo normal? (2008/2408)

a. # Disconnect connector and measure the

red ~ blue resistance on the water flow
servo side.

Normal: 10 ~ 30

$

If normal, go to b.

Faulty: Replace the water flow servo with

water flow sensor.

b. Disconnect connector, and measure the

voltage between orange (+) and grey(-) on
the water flow control side.

Normal: DC 11 ~ 13 V

If normal, go to (c).

Faulty: Replace the PCB unit.

c. With connector (E

) connected (do not

1

turn water ON... wait for the water flow
servo to return to fully open), measure the
voltage between brown and grey.

Normal: DC 4 ~ 6V

Faulty: Change water flow servo with

sensor.

d. Leaving the relay connector (E

)

1

connected (do not turn water ON... wait for
the water flow servo to return to fully
open), measure the voltage between yellow
and grey.

Normal: Less than DC 0.5 V

Faulty: Change water flow servo with

sensor.

E

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Anti frost heater does not operate

1) Are the ceramic anti-frost heaters OK?

a. # Disconnect connector (J

) and measure

3

the blue and blue resistance on the water
control heater side.

Normal: 950~1050 (2424, 2408, 2008)

590 ~ 660 (2007)

Ω

Ω

If normal, go to (b).

Faulty: Replace the water control heater

(2424, 2408, 2008).

Replace the anti-frost heater D assy

(2007).

b. # Disconnect connector (J

) and measure

3

the resistance between blue and blue on
the heater exchanger’s heater side.

Normal: 135 ~ 175

Ω

If normal, go to item 2) below.

Faulty: Replace anti-frost heater (assy)

2) Is the frost sensing switch normal?

a. # Detach connector (J

) and measure the

2

resistance between blue and blue.

Measure at room temperatur e of 4 ± 3 C.*

Normal: Less than 1

Ω

if normal, check the wiring (AC100V

circuit)

Faulty: Replace the frost sensing switch.

*

Where the low room temperature cannot be

achieved, plea se cool with i ced wat er or cold
water below 4 C.

°

°

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