Check Of Outdoor Unit - Mitsubishi Electric MSH09TW Service Manual

Compressor and/or outdoor fan does not operate. (Only indoor fan operates.)
D D Check of outdoor unit
Start
Yes
Operate the unit in COOL or HEAT mode by pressing the EMERGENCY OPERATION switch.
3-minute time delay works.
Test run operation operates for 30 minutes.
Compressor
doesn't operate.
Is there 5V DC between J8 –J9
on the deicer P.C. board?
Is there 115V AC (MSH09),208/230V AC
(MSH12/15/17) to terminal block between
3 (MSH09/12), COM (MSH15/17)on the
compressor contactor(52C) and N (MSH09),
L2 (MSH12/15/17)on
the outdoor terminal block?
Check the compressor and compressor capacitor, and rectify the connecting wire.
Outdoor fan motor
doesn't operate.
Is there 5V DC between J8 –J9
on the deicer P.C. board?
Check the outdoor fan motor and
rectify the connecting wire.
Compressor and/or outdoor fan motor doesn't stop.
E E Check of outdoor unit
1 Turn OFF the power supply.
2 After 30 seconds, turn ON the power supply again.
3 Operate the unit in COOL or HEAT mode by
pressing the EMERGENCY OPERATION switch for 1 minute or more.
4 Stop it by pressing the EMERGENCY OPERATION switch twice or once.
After 30 seconds,
does compressor stop?
After 30 seconds, does
outdoor fan motor stop?
Is there 115V AC (MSH09),
No 208/230V AC (MSH12/15/17) between
– +
4 on the compressor contactor (52C)
(MSH09/12), TAB21(MSH15/17) and
TAB20 on the deicer P.C. board?
Yes
Replace the deicer P.C. board.
No
Yes
Is there 115V AC (MSH09),
208/230V AC (MSH12/15/17) between
No
+
–
4 on the compressor contactor (52C)
(MSH09/12), TAB21(MSH15/17) and
TAB20 on the deicer P.C. board?
Yes
Replace the deicer P.C. board.
Is there 115V AC (MSH09),208/230V AC
(MSH12/15/17) to terminal block between
No
3 (MSH09/12), COM (MSH15/17)on the
compressor contactor(52C) and N (MSH09)
L2 (MSH12/15/17) on the outdoor
Yes
terminal block?
Ok
Replace the deicer P.C. board.
No
Replace the deicer P.C. board.
Yes
Ok
No
Yes
Replace the deicer P.C. board.
No
Yes
Yes
86
Rectify the indoor and
outdoor connecting wire.
No
Is there 115V AC(MSH09), 208/230V AC
(MSH12/15/17) to terminal block between
L1 - N (MSH09), L1 - L2 (MSH12/15/17)?
Yes
Rectify the connecting wire.
Rectify the indoor and
outdoor connecting wire.
No
Is there 115V AC(MSH09), 208/230V AC
(MSH12/15/17) to terminal block between
L1 - N (MSH09), L1 - L2 (MSH12/15/17)?
Yes
Rectify the connecting wire.
No
Rectify the connecting wire.