Mitsubishi Electric City Multi PQHY-P72 Service Handbook page 227

[ IX Troubleshooting ]
Error Code
1301 Abnormal low
pressure
Error definition and error
detection method
When starting the com- (1) Inner pressure drop due to
pressor from Stop Mode
for the first time if low- (2) Low pressure sensor fail-
pressure reads
0.098MPa[14psi] imme- (3) Torn outer rubber
diately before start-up, (4) A pin on the male connec-
the operation immediate-
ly stops. (5) Disconnected wire
(6) Failure of the low pressure
Cause
a leakage.
ure
tor is missing.
input circuit on the control-
ler board
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Check method and remedy
Refer to the section on troubleshoot-
ing the low pressure sensor.