Rinnai REU-2018W Service Manual page 37

7) Is the combustion fan normal?
8) Is the sparker operating normally?
Infinity REU-2425W
Motor check
If error "61" is displayed, check combustion
fan.
k. Measure the voltage at the connector
(D ) black ~ red
1
Normal: DC 6~40V (fan on)
DC 0V (fan off)
If normal, go (1)
Faulty: Replace the PCB unit
Fan Revolution Sensor Check
l. Measure the voltage at connector
D , black ~ yellow
1
Normal: DC11~13V
If normal, go (m) below
Faulty: Replace the PCB unit
m. Measure the voltage at connector
D , black ~ white
1
Normal: DC2~9V
If normal, proceed to check item 5) below
Faulty: Replace the combustion fan.
Checking the motor
n. Measure the voltage at connector I
grey ~ grey
Normal: DC 90 ~ 110 V
DC 0 V (when fan is OFF)
If normal, check (o) below.
Faulty: Replace the PCB unit
o. # Disconnect I
resistance between sparker
terminals
Normal: >1M
Ω
If there is no spark, adjust or replace the
electrode.
Faulty: Replace the sparker.
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4
, and measure the
4
Issue 2 - 5/07/04 ©Rinnai
.