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Error Code [1302] (At Startup); Error Code [1500] - Mitsubishi Electric PURY-HP72 Service Handbook

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[7-3 Error Code Definitions and Solutions: Codes [1000 - 1999] ]
7-3-4

Error Code [1302] (at startup)

1. Error code definition
High pressure fault 2 (Outdoor unit)
2. Error definition and error detection method
If the pressure of 0.098MPa [14psi] or lower is registered on the pressure sensor immediately before start-up, it will trigger an
abnormal stop, and error code "1302" will be displayed.
3. Cause, check method and remedy
(1)
Inner pressure drop due to a leakage.
(2)
Pressure sensor failure
(3)
Shorted-circuited pressure sensor cable due to torn
outer rubber
(4)
A pin on the male connector on the pressure sensor
is missing or contact failure
(5)
Disconnected pressure sensor cable
(6)
Failure of the pressure sensor input circuit on the
controller board
7-3-5

Error Code [1500]

1. Error code definition
Refrigerant overcharge
2. Error definition and error detection method
An error can be detected by the discharge temperature superheat.
1) If the formula "TdSH
10°C [18°F]" is satisfied during operation (first detection), the outdoor unit stops, goes into the 3-minute
restart mode, and starts up in three minutes.
2) If the formula "TdSH
10°C [18°F]" is satisfied again within 30 minutes of the first stoppage of the outdoor unit (second de-
tection), the unit comes to an abnormal stop, and the error code "1500" appears.
3) If the formula "TdSH
10°C [18°F]" is satisfied 30 minutes or more after the first stoppage of the outdoor unit, the same se-
quence as Item "1 above (first detection) is followed.
4) For 30 minutes after the stop of the outdoor unit, preliminary errors will be displayed on the LED display.
3. Cause, check method and remedy
(1)
Overcharged refrigerant
(2)
Thermistor input circuit failure on the control board
(3)
Faulty mounting of thermistor (TH4)
(4)
Solenoid valve actuation failure (SV5b)
(5)
Solenoid valve actuation failure (SV4a, SV4b, or
SV4d)
→ Heating only or heating main
(6)
LEV5a failure→ Heating only or heating main
(7)
LEV4 failure→ Heating only or heating main
HWE13080
Cause
Cause
Check method and remedy
Refer to the following page(s). [8-5-1 Comparing the
High-Pressure Sensor Measurement and Gauge
Pressure](page 267)
Check method and remedy
Refer to the following page(s). [6-9 Evaluating and Adjust-
ing Refrigerant Charge](page 161)
Check the temperature and pressure readings on the sen-
sor that are displayed on the LED monitor.
Check the temperature and pressure readings on the
thermistor that are displayed on the LED monitor.
Perform a cooling or heating operation and check the oper-
ation.
[8-8 Troubleshooting LEV Problems](page 273)
- 183 -
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