Error Code [1302] (During Operation) - Mitsubishi Electric HP120TNU-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 of 3.78MPa [548psi] or higher is detected by the pressure sensor during operation (the first detection), the out-
door stops once, turns to antirestart mode for 3 minutes, and restarts after 3 minutes automatically.
2) If the pressure of 3.78MPa [548psi] or higher is detected by the pressure sensor again (the second detection) within 30 min-
utes after the first stop of the outdoor unit, the outdoor unit stops once, turns to anti-restart mode for 3 minutes, and restarts
after 3 minutes automatically.
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
3. Cause, check method and remedy
(1) Indoor unit LEV actuation failure
(2) BC controller LEV malfunction
Heating only or heating main: Indoor LEV 3, 4
Defrost: LEV3, 4
(3) BC controller SVM1 and 2 malfunction
Cooling only or defrost
(4) BC controller SVA and SVC malfunction
Cooling only or cooling main
(5) BC controller SVB malfunction
Solenoid valve actuation failure (SV4a, SV4b, SV4c, or SV4d)
Cooling only or cooling main
(6) Actuation failure in the four-way valve (21S4a, 21S4b, or 21S4c)
or the expansion valve (LEV2a, LEV2b, LEV2c, or LEV2d)
ing-only or cooling-main
(7) Port address setting error.
(8) Refrigerant service valve actuation failure
(9) Short cycle on the indoor unit side
(10) Clogged filter on the indoor unit
(11) Reduced air flow due to dirty fan on the indoor unit fan
(12) Dirty heat exchanger of the indoor unit
(13) Indoor fan (including fan parts) failure or motor failure
Items (7) through (12) above reduce the condensing capability of
the unit, resulting in high-pressure rise during heating operation.
(14) Short cycle on the outdoor unit
(15) Dirty heat exchanger of the outdoor unit
(16) Outdoor fan (including fan parts) failure, motor failure, or fan con-
troller malfunction
Items (13) through (15) above reduce the condensing capability of
the unit, resulting in high-pressure rise during cooling operation.
(17) Solenoid valve (SV1a) malfunction
The by-pass valve (SV1a) can not control rise in high pressure.
(18) Thermistor failure (TH3, TH7)
(19) Pressure sensor failure
(20) Failure of the thermistor input circuit and pressure sensor input cir-
cuit on the controller board
10
- chapter 7
psi]
Cause
Heating only or heating main
Check method and remedy
Perform a heating operation and check the operation.
Cooling: Four-way valves
(21S4a, 21S4b, and 21S4c) on the outdoor
unit
Expansion valves (LEV2a, 2b, 2c, and 2d)
LEV on the indoor unit
BC controller LEV1,3,
SVM1,1b,2,2b, SVA
Heating: LEV on the indoor unit
BC controller LEV3,
SVM2,2b, SV4a,SV4b,
SV4c,SV4d
Refer to the following page(s). [8-8 Troubleshooting
Cool-
LEV Problems]
Confirm the port address of the indoor unit.
Confirm that the refrigerant service valve is fully
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
Outdoor Unit Fan Problems]
Refer to the following page(s). [8-6 Troubleshooting
Solenoid Valve Problems]
Refer to the following page(s). [7-7-2 Error Codes
[5103,5104,5105,5107,5115]]
Refer to the following page(s). [8-5-1 Comparing the
High-Pressure Sensor Measurement and Gauge
Pressure]
Check the sensor temperature/pressure on the LED moni-
tor.
HWE18220_GB