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Part 4 - Diagnosis and T
roubleshooting
4.13 P6 Troubleshooting
4.13.1 Digital display output
4.13.2 Description
4.13.3 Possible causes
P6 indicates compressor inverter module protection.
When P6 error occurs, a manual system restart is required before the system can resume operation. The cause of
P6 error should be addressed promptly in order to avoid system damage.
All units stop running.
Error code is displayed on the main PCB and user interface.
Inverter module protection.
DC bus low or high voltage protection.
MCE error.
Zero speed protection.
Phase sequence error.
Excessive compressor frequency variation.
Actual compressor frequency differs from target frequency.
4.13.4 Specific error codes for P6 inverter module protection
If a P6 error code is displayed, press button SW3 until one of the following specific error codes is displayed on the
digital display: xL0, xL1, xL2, xL4, xL5, xL7, xL8, xL9. Refer to Figure 4-4.1 and Table 4-4.1.
Figure 4-4.1: Button SW3 on main PCB
