Rinnai REU-2018W Service Manual page 36

5) Is the flame rod normal? Error "72" is displayed
6) Is the water temperature thermistor normal?
Infinity REU-2425W
Checking the flame rod.
i. # Detach the flame rod terminal A
and 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 and the appliance earth.
2
Normal: 1 M
If normal, replace the PCB unit.
Faulty: Replace the flame rod.
If error "32" is displayed, check the water
temperature thermistor.
j. # Disconnect connector C
measure the resistance of white and
white.
Resistance > 1M
Resistance < below 1
Normal: proceed to check item 4) on next
page.
Faulty: replace the water temperature
thermistor.
- 33 -
Ω
or more
, and
1
Ω
= open circuit.
Ω
= short circuit.
Issue 2 - 5/07/04 ©Rinnai
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2