Mitsubishi Electric PUMY-P100VHM Technical & Service Manual page 37

Display
Meaning and detecting method
Drain sensor (THd, DS) abnormality
2503
When the drain sensor detects short/open
while the operation.
4100 Compressor overcurrent interruption (When
compressor locked)
Abnormal if overcurrent of DC bus or
compressor is detected within 30 seconds after
compressor starts operating.
Over current : 27.5A
4116 Fan rotational frequency abnormality
(Detected only PKFY-P·VAM-E)
1 When rotational frequency of the fan is
detected 180 rpm or less, or 2000 rpm or
more (1st detection) while the indoor unit
fan operation, the fan stops for 30 seconds.
2 When the rotational frequency of the fan is
detected 180 rpm or less, or 2000 rpm or
more again after the fan restarts, the indoor
unit stop abnormally (fan stops). In this time,
<4116> is displayed.
Causes
1 Connector (CN50) contact failure
(insertion failure)
2 Thermistor wiring disconnection or half
disconnection
3 Thermistor defective
4 Indoor controller board (detecting circuit)
failure
1 Stop valve is closed.
2 Decrease of power supply voltage
3 Looseness, disconnection or converse of
compressor wiring connection
4 Defective compressor
5 Defective outdoor power board
1 Fan rotational frequency detecting
connector (CN33) disconnection in the
indoor controller board
2 Fan output connector (FAN1)
disconnection in the indoor power board
3 Fan rotational frequency detecting
connector (CN33) wiring breakage in the
controller board or fan output connector
(FAN1) breakage in the indoor power board
4 Filter clogging
5 Indoor fan motor trouble
6 Fan rotational frequency detecting circuit
failure in the indoor controller board or
fan output circuit failure in the indoor
power board
37
Check points
1
Check whether the indoor controller
board connector (CN50) is
disconnected or not.
2
Check whether the thermistor wiring is
disconnected or not.
3
Check the resistance of thermistor.
4
If abnormality is not found in the
method of the above-mentioned from
1 to 3, it is defective of the indoor
controller board.
1 Open stop valve.
2 Check facility of power supply.
3 Correct the wiring (U·V·W phase) to
compressor.
4 Check compressor.
5 Replace outdoor power circuit board.
1 Check whether the connector (CN33) in
the indoor controller board is dis-
connected or not.
2 Check whether the connector (FAN1) in
the indoor power board is disconnected
or not.
3 Check whether the wiring is dis-
connected or not.
4 Check the filter.
5 Check the indoor fan motor.
6 When there is no problem in the above-
mentioned from 1 to 5;
(1) In the case of abnormality after the
fan operation;
Replace the indoor controller board.
When the fan does not recover even if
the indoor controller board is replaced,
replace the indoor power board.
(2) In the case of abnormality without fan
operation, replace the indoor power
board.