Mitsubishi Electric PURY-P200 Service Handbook page 161

Phenomena
2 Heating with normal remote
controller display but not
providing capacity.
3
Factors
(3) When abnormal temperature of
indoor unit piping temperature
sensor is taken higher, LEV is
throttled excessively due to
apparent small sub-cooling.
(4) Abnormal speed of outdoor unit fan
1 Faulty motor or board, or heat
exchanger clogging lowers
airflow rate. This lowers airflow
rate and low pressure leading to
increase discharge temperature.
2 Faulty temperature intake of
piping sensor causes fan control
malfunction.
(5) Faulty insulation of refrigerant
piping
(6) Long piping length
Excessively long piping length at
high pressure side causes high
pressure loss leading to decrease
in high pressure.
(7) Piping size is not proper (slender)
(8) Clogging by foreign matter
(9) Indoor unit inlet temperature
excessively high (exceeding 28˚C)
(10) Insufficient refrigerant volume
Discharge temperature drops
while frequency does not rise.
Likely to enter refrigerant
recovery operation.
(11) Faulty compressing (as same in
case of cooling)
As a previous step to apply emergency
stop under error mode, the first
detection will not be applied with
emergency stop as it is stopping under
the 3 minutes restart prevention mode
as an intermittent fault checking.
1 High pressure error
2 Discharge temperature error
3 Radiator panel thermistor error
4 Thermistor error
5 Pressure sensor error
6 Overcurrent shutout
7 Refrigerant over charge error
Notes:1. Freeze protection tripping only
under cooling mode may be
considered in addition to the
above. (Freeze protection is
detected by one or all indoor
units.)
2. With some error codes,
emergency stop is not
commenced even at the
second stopping.
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Checke method & Handling
Check piping thermistor.
Refer to the page of outdoor unit fan.
Check the characteristic of capacity
decrease by piping length.
→ Modify piping
Check pressure difference between
before and after a portion (strainer,
distributor) of high pressure (gas)
piping where foreign matter may likely
be clogged. Difficult to confirm
clogging inside extended piping. Check
clogging in the same manner in cooling
by operating under cooling cycle.
→ Remove foreign matter
Check inlet temperature and short
cycle at indoor unit side.
To improve using manner
Refer to Item 2-(1).
(Insufficient frequency rise)
Refer to Item Refrigerant volume
adjustment.
Check discharge temperature.
(a) Check the mode operated in the
past by displaying intermittent fault
check history by LED display with
SW1.
(b) Check the mode for stopping
through the operation reproduced
displaying intermittent fault checking
by LED display with SW1.
↓
For each error mode, refer to the
relating page.
❉ When checking freeze protection
tripping, set SW1 to the status
displaying indoor piping
temperature table (Chapter 0) to
confirm the temperature.