Mitsubishi Electric PUHY-M200YNW-A1 Service Handbook page 199

[7-6 Error Code Definitions and Solutions: Codes [4000 - 4999] ]
Hydro unit
(1) Power supply environment
Find out if there was a (momentary) power failure.
Check that the power-supply voltage between L and N is 198 V or greater.
Check the power supply voltage waveform for distortion.
(2) Voltage drop detected
Check the voltage at relay connector RYPN while the inverter is stopped.
If the voltage is 248 VDC or above, check the following items.
1) Check the inverter's main circuit components for problems. See [8-10-18 Simple Check on Inverter Circuit Compo-
nents].
2) If the problem persists after reboot, replace the INV board.
If the voltage is 248 VDC or below, check the following items.
1) Check the wiring between the following.
SC-P1 (INV) and SC-P2 (INV)
CN110 (PS), SC-R (INV), and SC-T (INV)
FT001(PS), FT002 (PS), and ACL
CN301 (PS) and CN601 (MAIN)
2) Check the inverter's main circuit components for problems. See [8-10-18 Simple Check on Inverter Circuit Compo-
nents].
3) Control board failure.
Check that 12 VDC is applied to connector CN601 (pins 1 and 2) on the control board while the inverter is operating.
Replace the control board if the voltage is absent or a wrong voltage is applied.
For inverter-related error codes, refer to the following page(s). [8-10 Troubleshooting Inverter Problems]
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- chapter 7 BS_07_E