Mitsubishi City Multi PEFY-P72NMHSU-E, Техническое и сервисное руководство, Страница: 29 / 76

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HWE10170 GB
1. Error Code
Abnormal bus voltage rise (Indoor unit)
2. Error definition and error detection method
If Vdc 425V is detected during inverter operation.
3. Cause, check method and remedy
(1) Different voltage connection
Check the power supply voltage on the power supply terminal block (TB2).
(2) INV board failure
If the problem recurs, replace the INV board.
Refer to section [8] Troubleshooting, item 3. DC fan motor (fan motor/INV board) for error codes related to the inverter.
(page 47)
1. Error Code
Logic error (Indoor unit)
2. Error definition and error detection method
H/W error
If only the H/W error logic circuit operates, and no identifiable error is detected.
3. Cause, Check method and remedy
Refer to section [8] Troubleshooting, item 3. DC fan motor (fan motor/INV board) for error codes related to the inverter.
(page 47)
1. Error Code
Heatsink overheat protection (Indoor unit)
2. Error definition and error detection method
When the heat sink temperature (THHS) remains at or above 85°C [185°F] is detected.
3. Cause, check method and remedy
Refer to section [8] Troubleshooting, item 3. DC fan motor (fan motor/INV board) for error codes related to the inverter.
(page 47)
4225
4225
Cause Check method and remedy
(1) External noise If the problem recurs when the unit is put into opera-
tion, replace the INV board.
(2) INV board failure
4235
Cause Check method and remedy
(1) Air passage blockage Check that the heat sink cooling air passage is not blocked
(2) Fan motor error Check the fan motor for proper operation (sound, vibration, and rotation).
If any problems were found, check the items listed in sections 2 [3] and [4].
->Refer to [8] 3.2[3][4].(page 49)
(3) THHS failure If the problem persists after resuming operation, replace the THHS sensor.
(4) INV board fault If no problems were found with items (1) through (3) and the same error is de-
tected after resuming operation, replace the INV board.
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