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Mitsubishi Electric PURY-P72 Service Handbook page 229

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Table of Contents
[ IX Troubleshooting ]
In case of 4226 (For P120 and P144 type units, the fan box's fan board is applicable)
ŒCheck the voltage at CNVDC on the Fan board while the inverter is stopped and if it is 420 V or above, check the following
items.
1) Check the voltage at CN72 on the control board. ->Go to 3).
2) Check the noise filter coil connections and for coil burnout.
3) Check the wiring connections between the following sections
Between the noise filter board INV board and the Fan board.
4) Check contents 4220
Replace the Fan board if no problems are found.
ŒCheck the voltage at CNVDC on the Fan board while the inverter is stopped and if it is less than 420 V, check the following
items.
1) Check between noise filter board, inverter board, connector board, and fan board.
2) Check contents 4220
Replace the Fan board if no problems are found.
(3) Control board failure
Check that 12VDC is applied to connector CN72 on the control board while the inverter is operating. If voltage is absent or
the wrong voltage is applied, check the fuse F01. Replace the control board if no problems are found with the fuse.
Refer to section -7- "Inverter (YKMU-A)" under part [4] Troubleshooting Principal Parts for error codes related to the
inverter.(page 321)
HWE1116D
- 220 -
GB
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