Daikin Altherma EKHBH Series Service Manual page 124

Error Codes: Outdoor Units
1
Troubleshooting 1
3 3
4
5
3–38
An output over-current may result from wrong internal wiring. If the wires have been disconnected and
reconnected for part replacement, for example, and the system is interrupted by an output
over-current, take the following procedure:
Stop valve fully open?
YES
Turn off the power and turn it on
again to get the system started.
See if the same error occurs.
Error again?
YES
Turn off the power and disconnect
the harnesses U, V and W.
Check with the inverter checker (*)
Any LED off?
NO
Check No. 13
Check the power transistor.
Normal?
YES
Turn off the power, and reconnect the
harnesses. Turn on the power again and
get restarted.
Check the supply voltage.
Voltage as rated?
YES
Short-circuit
or breakage between
compressor's coil
phases?
NO
Check No. 08
Check the discharge pressure.
Check No. 07
Check the installation condition.
NO
NO
Monitor the supply voltage,
discharge and suction pressures,
and other factors for a long term.
Possible causes
• Instantaneous supply voltage
drop
• Compressor motor overloaded
• Contact-induced electrical short-
circuit
YES
NO
NO
YES
ESIE06-03
Fully open the stop valve.
Keep on using as it is
(monitor).
Check the electricals'
connectors and other
fittings.
∗ Inverter checker
Part No.: 1225477
Correct the power supply or
replace the PM1.
(Replace the outdoor unit
PCB.)
Replace the PM1.
(Replace the outdoor unit
PCB.)
Correct the power supply.
Replace the compressor.
Part 3 – Troubleshooting