Rpm Error/Motor Error - Mitsubishi City Multi PEFY-P72NMHSU-E Technical & Service Manual

1. Error Code
4116

RPM error/Motor error

2. Error definition and error detection method
LOSSNAY
∗The motor keep running even if the power is OFF.
∗The thermal overload relay is ON. (Only for the three-phase model)
Indoor unit
If detected less than 180rpm or more than 2000rpm, the indoor unit will restart and keep running for 3 minutes.If detected
again, the display will appear.
3. Cause, check method and remedy
(1) Board failure
(2) Motor malfunction
(3) Solenoid switch malfunction
1. Error Code
4225
Abnormal bus voltage drop (Indoor unit)
2. Error definition and error detection method
If Vdc 130V or less is detected during Inverter operation. (S/W detection)
3. Cause, check method and remedy
(1) Power supply environment
Check whether the unit makes an instantaneous stop when the detection result is abnormal or a power failure occurs.
Check whether the power voltage is 198V or above across all phases.
(2) Voltage drop detected
Check the voltage at CNVDC (between pins 1 and 3(+)) on the INV board while the inverter is stopped and if it is less than
220V, check the following items.
1) Check the wiring between TB2 and NF board, NF board and ACL, NF board and inrush current resistor, NF board and
DB01, NF board and INV board, NF board and indoor controller board.
2) Check the inrush current resistance.
Measure the interphase resistance of the resistor (R). 22 Ω
3) Check ACL for broken wires.
Check that the resistance between pins 1 and 3 (housing side) of the CNACL connector is not infinite ( ).
4) Check the diode bridge (DB01) for problem.
Refer to section 5. "Troubleshooting the diode bridge".(page 50)
5) If no problems were found with items 1) through 4) above, replace the NF board.
(3) Indoor controller board failure
Confirm that DC12V is applied to the connector CNXB2 (between pins 4 and 5(+)) on the Indoor controller board while the
inverter is operating. If not, replace the Indoor controller board.
(4) NF board failure
If the unit stops within 10 seconds after resuming operation and the same error is detected, replace the NF board.
(5) INV board failure
If no problems were found with items (1) through (4) above, 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)
HWE10170
Cause Check method and remedy
Replace the board.
Check for the motor and the solenoid switch.
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