Rinnai INFINITY REU-3203W, Service Manual

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Infinity REU-3203W - 29 - ©Rinnai
4. Flame Rod Circuit
Check flame rod.
Disconnect flame rod terminal (A
1
), and re-
operate.
“72” indicated:- Proceed to 3.
“72” is not indicated:- check for electrical
leaks from the flame rod.
Measure resistance between flame rod
terminal (A
1
) and appliance earth.
Normal: >1M
Ω
If normal, replace PCB.
Faulty: Replace flame rod.
a.) Remove the Flame Rod terminal (A
1
)
repeat operation procedure, if 72 is
displayed again check the Hot water
outlet thermistor.
If 72 is not displayed check current
leakage from the Flame Rod.
b.) Measure voltage between body earth and
Flame Rod terminal (A
1
).
Normal: Voltage AC100~160V
If normal, repalced PCB
Faulty: Replace Flame Rod.
c.) Check if the Flame Rod is securely fitted.
Normal: replace the PCB
Faulty: Adjust the fitting of the Flame
Rod
5. Earth Lead
Confirm the Earth Lead connection is secure
(at round terminal), and check for broken or
short circuits in the lead.
If normal, check other possible causes
for flame failure (is gas valve open?, is
the filter blocked? etc.).
If faulty, tighten the earth lead, PCB,
power cord and surge arrester.