Mitsubishi Electric City Multi PURY-EM200YNW-A1, Service Handbook

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[7-4 Error Code Definitions and Solutions: Codes [2000 - 2999] ]
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- chapter 7 BS_07_M
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7-4-9 Error Code [2519]
1. Error code definition
Water pressure drop
2. Error definition and error detection method
1) If the reading of the pressure sensor Pw1 or Pw2 is below 10 kPa while Pump 1 is in operation, or the reading of the pressure
sensor Pw3 or Pw4 is below 10 kPa while Pump 2 is in operation (first detection), the outdoor units and the pumps will stop,
go into the 3-minute restart delay mode, and then restart.
2) If the pressure reading goes down below 10 kPa again within 10 minutes of the stoppage of the pump and within 2 minutes
after the pump restarted (second detection), the outdoor units and the pumps will stop again, go into the 3-minute restart delay
mode, and then restart.
3) If the pressure reading goes down below 10 kPa again within 10 minutes of the stoppage of the pump and within 2 minutes
after the pump restarted (third detection), the units and the pumps will come to an abnormal stop, and the error code 2519 will
appear.

Detail codes: 201(Pw1), 202(Pw2), 203(Pw3), 204(Pw4)
3. Cause, check method and remedy
7-4-10 Error Code [2520]
1. Error code definition
Water pressure rise
2. Error definition and error detection method
1) If the reading of the pressure sensor Pw1 or Pw2 exceeds 900 kPa while Pump 1 is in operation, or the reading of the pressure
sensor Pw3 or Pw4 exceeds 900 kPa while Pump 2 is in operation (first detection), the outdoor units and the pumps will stop,
go into the 3-minute restart delay mode, and then restart.
2) If the pressure reading exceeds 900 kPa again within 10 minutes of the stoppage of the pump and within 2 minutes after the
pump restarted (second detection), the outdoor units and the pumps will stop again, go into the 3-minute restart delay mode,
and then restart.
3) If the pressure reading exceeds 900 kPa again within 10 minutes of the stoppage of the pump and within 2 minutes after the
pump restarted (third detection), the units and the pumps will come to an abnormal stop, and the error code 2520 will appear.

Detail codes: 201(Pw1), 202(Pw2), 203(Pw3), 204(Pw4)
3. Cause, check method and remedy
Cause Check method and remedy
(1) Clogged strainer Check the strainer for clogging.
(2) Insufficient supply-water pressure Check that the supply-water pressure is in the
range between 0.1 and 0.16 MPa.
(3) Air-vent failure 1) Make sure the air vent valves are located in appro-
priate locations. Refer to [8-14-3 Instructions for
the Air Vent Operation].
2) Vent the air again in accordance with the proce-
dures explained in [8-14-3 Instructions for the Air
Vent Operation].
Cause Check method and remedy
(1) Valve block fault When the LEDs on the control board (VB3a-VB3p)
are lit, check the valve block whose LED is lit for
loose connectors, wiring fault, and proper opera-
tion. When the LEDs described above are not lit,
check all the valve block for proper operation.
(2) Port address setting error Check the indoor unit port address settings.
(3) Deformed water pipe on site Check the water pipes on site for deformation.
(4) Pressure sensor fault Refer to [8-9-1 Pressure Sensor].
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