Mitsubishi Electric City Multi PEFY-P06NMSU-E, Technical & Service Manual

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[
VIII
Troubleshooting ]
- 22 - HWE08010 GB
(4) Drain-up mechanism
Measure the resistance between the terminals with a tester.
(coil temperature 20°C[68°F])
(5) Drain float switch (CN4F)
Disconnect the connector, and measure the resistance between terminals with a tester.
Valve closure fail-
ure (leaky valve) To check the LEV on the indoor unit, check the indoor unit liquid pipe temperature
that appears on the operation monitor on the outdoor unit's multi control board while
operating the indoor unit in question in the FAN mode and the other indoor units in
the cooling mode. Replace the LEV
if the amount of
leakage is great.
(A) Termistor (TH22)
Normally, the LEV is fully closed while the unit is in the FAN mode. If the valve is
leaky, liquid pipe thermistor reading will be lower than normal. If it is significantly
lower than the inlet temperature on the remote controller, valve closure failure is
suspected. If the amount of leakage is insignificant, replacement of LEV is unnec-
essary unless it is causing a problem.
Misconnections of
connectors or con-
tact failure Perform a visual check for disconnected connectors.
Perform a visual check of lead wire color. Disconnect the
connectors on
the control board
and perform a
continuity test.
Symptom Checking Criteria Remedy
(A)
LEV
Normal Abnormal
340 Open or short
(A) Moving part
(B) Switch
(C) Magnet
Position of the moving part Normal Abnormal
Up Short (any position but short)
Down Open (any position but open)
1
3
1
2
3
4
(A)
(A)
(B)
(C)