Mitsubishi Electric PUMY-P125VMA1 Technical & Service Manual page 38

Display Meaning and detecting method
1102 Discharge temperature abnormality
1
When the discharge temperature thermistor
;
(TH1) detects 125
the compressor stops and restarts operation
in 3 minutes.
2
When the thermistor detects 125
again (2nd detection) within 30 minutes
since the compressor has stopped, the
compressor stops and restarts operation in 3
minutes.
3
When the thermistor detects 125
again (3rd detection) within 30 minutes since
the compressor has stopped 2 times, the
compressor stops abnormally. <1102> is
displayed.
4
When the thermistor detects 125
more after 30 minutes since the
compressor has stopped (1st or 2nd time),
it becomes the 1st detection or the same
performance as above-mentioned
5
It is being delay for abnormal stop during 30
minutes since the compressor has stopped.
In this time, check delay code <1202> will
be displayed.
Compressor inner thermo abnormality
1108
1
When the inner thermo performs (1st
detection) during the compressor operation,
the compressor stops and restarts operation
in 3 minutes.
2
When the inner thermo performs again (2nd
detection) within 30 minutes since the
compressor has stopped, or does not
recover within 30 minutes, it stops
abnormally. In this time <1108> is displayed.
3
When the inner thermo performs after 30
minutes since the compressor has stopped
(1st stop), it is the 1st detection and
becomes the same performance as above-
1
mentioned .
4
It is being delay for abnormal stop during
30 minutes since the compressor has
stopped. In this time, check delay code
<1208> will be displayed.
1302
High-pressure pressure abnormality
1
When high-pressure pressure sensor
detects 2.94MPa or more (1st detection)
during the compressor operation, the
compressor stops and restarts operation in
3 minutes
1) Gas leakage, Gas shortage
or more (1st detection),
2) Overloaded operation
3) Indoor linear expansion valve
operation defective
;
or more
4) Ball valve operation defective
5) Outdoor fan block and defective of
fan motor (heating mode)
;
or more
6) Gas leakage between high and low
pressure (Defective of 4-way valve or
compressor)
7) Solenoid valve (SV1) performance
;
or
defective (control failure to prevent the
discharge temp. from rising by SV1)
1
.
8) Thermistor defective
9) Input circuit defective of multi
controller board
1) Low voltage supplied to power supply
terminal block
2) Power supply L2 or L3 phase is
opened. (When L1 phase is opened,
power supply of the micro computer is
not supplied.)
3) Compressor failure (Over current by
motor rare short, etc.)
4) Overloaded operation
5) Gas leakage, Gas shortage
6) Inner thermo defective
7) Input circuit defective of multi
controller board or power supply board
1) Indoor unit short cycle
2) Indoor unit filter clogging
3) Air flow capacity decrease due to
indoor fan dirt
4) Indoor heat exchanger dirt
Causes
Check the refrigerant amount.
Check the indoor/outdoor unit operating
condition and status.
Perform cool or heat operation to check
the condition.
Check ball valve is fully opened.
Check the outdoor fan motor.
Check the operating condition.
Check the solenoid valve performance.
Check the thermistor resistance.
Check the intake temperature in
discharge temperature thermistor (TH1)
by LD1. (See 5101 Discharge
temperature thermistor error)
Measure the terminal voltage.
Check the voltage reduction.
Check the open phase.
Check the coil resistance.
Check the indoor/outdoor unit operating
condition and status.
Check the refrigerant amount.
When the inner thermo is normal and
input circuit is defective, even if the
inner thermo performs, the compressor
does not operate and becomes error in
30 minutes.
Check the indoor unit.
Check the indoor unit filter.
Check the indoor fan.
Check the indoor unit heat exchanger.
38
Check points
Check the current flows in inner thermo.