High Pressure Trouble - Mitsubishi PUMY-P60NKMU Technical & Service Manual

Check code
1302
Abnormal points and detection methods
<63H equipped model (63HS non-equipped)>
(1) High pressure abnormality (63H operation)
Abnormal if 63H operates(*) during compressor operation. (* 4.15MPa)
<63HS equipped model (63H non-equipped)>
(2) High pressure abnormality (63HS detected)
Abnormal if a pressure detected by 63HS exceeds 4.15MPa during
compressor operation.
63H : Higi-pressure switch
63HS : Higi-pressure sensor
LEV : Linear expansion valve
SV1 : Solenoid valve
TH7 : Outdoor temperature thermistor
●Diagnosis of defectives
Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards.
Is 5201 displayed when restart?
Is the outdoor stop valve (ball
valve) fully open ?
Does the outdoor fan rotate while
the operation?
Does the indoor fan rotate while
the operation?
Is the indoor unit short-cycled?
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OCH502C

High pressure trouble

Diagnosis
Yes
(5201)
(1302)
No
No
Yes
No
Yes
No
Yes
Yes
(short-cycled)
(no short-cycle)
No
Causes and check points
Defective operation of stop valve (not fully open)
Clogged or broken pipe.
Malfunction or locked outdoor fan motor
Short-cycle of outdoor unit
Dirt of outdoor heat exchanger
Remote controller transmitting error caused by noise interference
Contact failure of the outdoor controller board connector
Defective outdoor controller board
Short-cycle of indoor unit
Decreased airfl ow, clogged fi lter, or dirt on indoor unit.
Malfunction or locked indoor fan motor.
Decreased airfl ow caused by defective inspection
of outdoor temperature thermistor (It detects lower
temperature than actual temperature.)
Indoor LEV performance failure
Malfunction of fan driving circuit
SV1 performance failure
Defective high-pressure sensor
Defective high-pressure sensor input circuit on
outdoor controller board
Refer to the diagnosis of check code 5201.
Open the stop valve (ball balve) fully.
Check the outdoor fan motor
Refer to "How to check the parts" on the
outdoor unit servive manual.
Check the indoor fan motor
Refer to "How to check the parts" on the
indoor unit servive manual.
Solve the short-cycle.
39
Chart 1 of 4
Remedy