68 PB
TROUBLESHOOTING
E9 Function Error
In COOLING mode, E9 is Refrigerant high pressure protection.
Reasons and solutions:
Outdoor air circulation is bad. Check if any obstacle blocks the air circulation.
Condenser is too dirty. Wash the condenser.
Unit installation error. If the wall sleeve is too wide, the condenser can not exchange air well with the ambient air.
Correct the installation. Refer to the Installation/ Operation manual.
Outdoor fan is not running or running speed is too low. Check the fan.
The fan blade should be rotated smoothly and the wiring is not loose.
Figure 712
Outdoor Ambient temperature is too high. Increase the set point (this will get more cycles of compressor and let the
condenser cool down. This may help avoid E9 error
Condenser coil temperature sensor broken. Replace it.
Jumper on the main board getting loose. Reconnect it. The interface is for a reserved protection(nnot used so far). If
the jumper gets loose, the MCU will think the system is faulted and must be shut down.
Figure 711
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