(R7270)
Caution
Be sure to turn off the power switch before connecting or disconnecting
the connector, or parts damage may occur.
NO
YES
NO
YES
NO
YES
YES
NO
NO
YES
YES
NO
Monitor the supply voltage,
discharge and suction pressures,
and other factors for an extended
period of time.
Possible causes
Instantaneous supply voltage
drop
Compressor motor overloaded
Contact-induced electrical
short-circuit
* An output overcurrent may result from incorrect internal wiring. If the wires have been disconnected and
reconnected for part replacement, for example, and the system is interrupted by an output overcurrent,
check the wires again.
Check No. 08
Check the discharge pressure.
Check No. 13
Check the power transistor.
Check No. 07
Check the installation condition.
Check with the inverter checker (*).
Turn off the power and disconnect
the harnesses U, V and W.
Turn off the power, and reconnect
the harnesses. Turn on the power
again and get restarted.
Turn off the power and turn it on
again to get the system started.
See if the same error occurs.
Check the supply voltage.
Keep on using as it is
(monitor).
Check the electrical
connectors and other
fittings.
Fully open the stop valve.
Correct the power supply.
Replace the compressor.
Correct the power supply or
replace the SPM.
(Replace the outdoor unit
PCB.)
Replace the SPM.
(Replace the outdoor unit
PCB.)
Normal?
Error again?
Stop valve fully
open?
Voltage as rated?
Any LED off?
* Inverter checker
Part No.: 1225477
Short-circuit
or breakage between
compressor's coil phases?
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