Error Code [1302] (During Operation) - Mitsubishi Electric PUHY-P250YNW-A Service Handbook

[7-3 Error Code Definitions and Solutions: Codes [1000 - 1999] ]
7-3-3

Error Code [1302] (during operation)

1. Error code definition
High pressure fault 1 (Outdoor unit)
2. Error definition and error detection method
1) If the pressure sensor detects a pressure of 3.78 MPa [548 psi] or higher during operation, the outdoor unit stops, goes into
the 20-second restart delay mode, and automatically restarts after 20 seconds.
2) If the pressure sensor detects a pressure of 3.78 MPa [548 psi] or higher again (second detection) within 30 minutes of the
first stoppage of the outdoor unit, the outdoor unit stops, goes into the 20-second restart delay mode, and automatically re-
starts after 20 seconds.
3) If the pressure of 3.87MPa [561psi] or higher is detected by the pressure sensor (the third detection) within 30 minutes of the
second stop of the outdoor unit, the outdoor unit will make an error stop, and the error code "1302" will be displayed.
4) If the pressure of 3.78MPa [548psi] or higher is detected more than 30 minutes after the stop of the outdoor unit, the detection
is regarded as the first detection, and the operation described in step 1 above will start.
5) For 30 minutes after the stop of the outdoor unit, preliminary errors will be displayed on the LED display.
6) The outdoor unit makes an error stop immediately when not only the pressure sensor but also the pressure switch detects
+0,-0.15 +0,-22
4.15 MPa [601
7) Open phase due to unstable power supply voltage may cause the pressure switch to malfunction or cause the units to come
to an abnormal stop.
3. Cause, check method and remedy
(1) Indoor unit LEV2 actuation failure -> Cooling
(2) Closed refrigerant service valve
(3) Short cycle on the indoor unit side
(4) Clogged filter on the indoor unit
(5) Reduced air flow due to dirty fan on the indoor unit
fan
(6) Dirty heat exchanger of the indoor unit
(7) Short cycle on the outdoor unit
(8) Dirty heat exchanger of the outdoor unit
(9) Outdoor fan (including fan parts) failure, motor
failure, or fan controller malfunction
Rise in discharge temp. by low pressure drawing
for (7) - (9).
(10) Solenoid valve (SV1a) malfunction (The by-pass
valve (SV1a) can not control rise in high pres-
sure).
(11) Thermistor failure (TH3, TH7)
(12) Pressure sensor failure
(13) Failure of the thermistor input circuit and pressure
sensor input circuit on the controller board
(14) Thermistor mounting problem (TH3, TH7)
(15) Disconnected male connector on the pressure
switch (63H1) or disconnected wire
(16) Voltage drop caused by unstable power supply
voltage
8
- chapter 7
psi]
Cause Check method and remedy
Perform a cooling operation to check the operation.
Cooling: Indoor unit LEV2
Refer to the following page(s). [8-8 Troubleshooting LEV
Problems]
Confirm that the refrigerant service valve is fully open.
Check the indoor units for problems and correct them, if
any.
Check the outdoor units for problems and correct them, if
any.
Check the fan on the outdoor unit.
Refer to the following page(s). [8-7 Troubleshooting Out-
door Unit Fan Problems]
Refer to the following page(s). [8-6 Troubleshooting Sole-
noid Valve Problems]
Refer to the following page(s). [7-7-2 Error Codes
[5102,5103,5104,5105,5106,5107,5115]]
Refer to the following page(s). [8-5-1 Comparing the High-
Pressure Sensor Measurement and Gauge Pressure]
Check the temperature and the pressure of the sensor
with LED monitor.
Check the temperature and the pressure of the sensor
with LED monitor.
Check the input voltage at the power supply terminal block
(TB1).
BS_07_C