22
B
B
Check of outdoor unit serial signal
No
Yes
Start
1. Check the indoor unit with referring to the indoor unit service manual.
2. Turn off the power supply of the indoor and outdoor unit and return the indoor/ outdoor unit connecting wire to former
original.
3. Check the connection of indoor/ outdoor unit connecting wire in the outdoor unit terminal block, and check the connection
of the connector (CN601: unit A, CN602: unit B) in the control P. C. board
4. Disconnect the lead wire to the compressor. Turn on the power supply (indoor/ outdoor unit) 3 minutes later,
EMERGENCY OPERATION starts.
Is there voltage from 5V DC - 10V DC between
No. 3 (+) and N (-) in the outdoor terminal block.
Replace the outdoor electronic control P. C. board.
Recheck a connected circumstance of the indoor/ outdoor unit connecting wire.
Turn on power supply
No
Yes
Yes
No
No
Yes
Start
Check the connecting of main circuit parts .
Is there voltage of 230V AC in the
power supply terminal block?
Is there voltage of 325V DC across the
smoothing capacity?
Check the power supply cable.
Check the main circuit parts
and replace it.
Replace the outdoor electronic control
P. C. board.
Replace the noise
filter P. C. board
Is there voltage of 230V AC across the
input terminal part in the diode module
(DS61)?
A
A
Check of power supply
OB280-1.qxp 01.4.4 2:40 PM Page 22
Summary of Contents for MXZ-18TV
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