Infinity REU-VRM3237WG / HD250e REU-VRM3237WC - 23 - Issue 1 - 19/05/09 ©Rinnai
7. Thermal Fuse
Overheat switch and thermal fuse circuit
1. Disconnect overheat switch terminals (G
2
) and measure resistance between overheat
switch terminals (G
2
).
Normal: < 1
If not normal replace overheat switch.
If normal reconnect overheat switch terminals (G
2
) and proceed to step 2.
2. Disconnect relay connectors G
1
and E
3
and measure resistance between the white and
red wires.
Normal: < 1
If not normal replace thermal fuse.
If normal replace PCB
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.
8. Water Flow Sensor (G
3
)
a.) Measure voltage between Red - Black of relay connector (G
3
).
Normal: DC 11~13V
If normal, proceed to b.
Faulty: Repl
ace PCB.
b.) Measure
voltage between Yellow - Black of relay connector (G
3
).
Normal: DC 4~7V
If normal, proceed to 2.
Faulty: Replace water flow sensor.
Note: For contro
ller readout of water flow whilst operational refer main
tenance monitor
(chapter 17.) No. 1)
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