Rinnai HD250E REU-V3232WC, Service Manual

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Infinity REU-V3232W /HD250E REU-V3232WC - 29 - Issue 1 - 8/09/03 ©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.