Mitsubishi Electric City Multi CMH-WM250V-A, Service Handbook

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[7-3 Error Code Definitions and Solutions: Codes [1000 - 1999] ]
BS_07_E chapter 7 -
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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
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 "ToilSH (shell bottom SH) 10°C [50°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 [50°F]" is satisfied again within 30 minutes of the fifth stoppage of the outdoor unit (sixth detec-
tion), the unit comes to an abnormal stop, and the error code "1500" appears.
3) If the formula "ToilSH (shell bottom SH) 10°C [50°F]" is satisfied 30 minutes or more after the first stoppage of the outdoor
unit, the same sequence 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
(18) Open phase in the power-supply due to improper
power-supply wiring
Refer to item (5) in section [6-1 Read before Test Run].
Cause Check method and remedy
(1) Inner pressure drop due to a leakage. Refer to the following page(s). [8-5-1 Comparing the
High-Pressure Sensor Measurement and Gauge
Pressure]
(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) Open phase in the power-supply due to improper
power-supply wiring
Refer to item (5) in section [6-1 Read before Test
Run].
Cause Check method and remedy
(1) Overcharged refrigerant Refer to the following page(s). [6-3 Evaluating and Adjust-
ing Refrigerant Charge]
(2) Thermistor input circuit failure on the control board Check the temperature and pressure readings on the sen-
sor that are displayed on the LED monitor.
(3) Faulty mounting of thermistor (TH15) Check the temperature and pressure readings on the
thermistor that are displayed on the LED monitor.
(4) Outdoor unit LEV2 actuation failure -> Heating Refer to the following page(s). [8-8 Troubleshooting LEV,
FCV Problems]
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