Rinnai REU-V1616WF, Service Manual

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Infinity REU-V1616WF - 28 - Issue 1 - 21/11/03 ©Rinnai
8. 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.
9. Thermal Fuse Circuit
Check the Thermal Fuse.
Disconnect relay connector (B
3,
) and (B
4
) and measure resistance between Red and Red.
Normal: < 1
Ω
If normal, replace PCB.
Faulty: Replace Thermal Fuse if after confirming there is no damage to the appliance.
10. Overheat Switch Circuit
Measure resistance between Overheat Switch terminals.
Normal: < 1
Ω
If normal, replace PCB.
Faulty: Replace Overheat Switch.
Note: If Thermal fuse or Overheat Switch were faulty.
a.) Check heater for damage
b.) Confirm gas type and combustion dipswitch settings
c.) Confirm test point pressure.
11. Water Flow Sensor
a.)
Measure voltage between Red - Black of relay connector (B
2
).
Normal: DC 11~13V
If normal, proceed to
b
.
Faulty: Replace PCB.
b.)
Measure voltage between Yellow - Black of relay connector (B
2
).
Normal: DC 4~7V
Faulty: Replace water flow sensor.
Note: For controller readout of water flow whilst operational refer maintenance monitor.