Mitsubishi Electric PURY-P72TYJMU-A Service Handbook page 305

[ IX Troubleshooting ]
Is the wiring between the
FAN board, 52F, and fan
motor connected correctly?
YES
Does 52F operate on the
coil voltage (206-252V)?
YES
Is a voltage of
between 188V and 253V (TJMU) or
between 414V and 506V (YJMU)
applied to the power supply input?
YES
HWE0913A
NO
NO
NO
Check the wiring between
52F and the control board.
YES
Check that the secondary voltage on the
transformer is between 206V and 252V.
Fuse is normal
YES
- 296 -
Correct the wiring according to the wiring
diagram.
Replace 52F.
NO Correct the wiring according to the
wiring diagram.
NO
Replace the transformer and fuse.
Replace the control board.
GB