Infinity REU-VRM3237WG / HD250e REU-VRM3237WC
-
2
3 -
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:
Replace 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 controller readout of water flow whilst operational refer maintenance monitor
(chapter 17.) No. 1
)
