Rinnai REU-2007W, Service Manual

Page: 43 / 69

Infinity REU-2007,2008,2408,2424 - 38 - ©Rinnai
2) Is the flame rod normal? Error “72” is displayed
Checking the flame rod.
a. # Detach the flame rod terminal A
2
, 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
2
and the appliance earth.
Normal: 1 M or more
If normal, replace the PCB unit.
Faulty: Replace the flame rod.
3) Is the water temperature thermistor normal?
If error “32” is displayed, check the water
temperature thermistor.
a. # Disconnect connector C
1
, and measure
the resistance of white and white.
Resistance > 1M = open circuit.
Resistance < below 1 = short circuit.
Normal: proceed to check item 4.) on next
page.
Faulty: replace the water temperature
thermistor.
Ω
Ω
Ω