Mitsubishi Electric PU(H)Y-P250YGM-A Service Handbook page 125

[ IX Troubleshooting ]
Error Code
1301 Abnormal low
pressure
Error definition and error
detection method
When starting the com-
pressor from Stop Mode
for the first time if low-
pressure reads
0.098MPa immediately
before start-up, the oper-
ation immediately stops.
Cause
(1) Inner pressure drop due to
a leakage.
(2) Low pressure sensor fail-
ure
(3) Short-circuited pressure
sensor cable due to torn
outer rubber
(4) A pin on the male connec-
tor is missing.
(5) Disconnected wire
(6) Failure of the low pressure
input circuit on the control-
ler board
- 116 -
Check method and remedy
Refer to the section on troubleshoot-
ing the low pressure sensor.