intensity VRF V5 Series Service Manual page 68

V5 X VRF 460V 60Hz
4.10 xH4 Troubleshooting
Digital display output
In the error code, 'x' is a placeholder for the compressor system (compressor and related electrical components), with 1
representing compressor system A and 2 representing compressor system B.
Description
 1H4 indicates compressor A inverter module protection.
 2H4 indicates compressor B inverter module protection.
 When an xH4 error occurs, a manual system restart is required before the system can resume operation. The cause of
an xH4 error should be addressed promptly in order to avoid system damage.
 All units stop running.
 Error code is only displayed on the unit with the error.
Possible causes
 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.
Specific error codes for xH4 inverter module protection
If an xH4 error code is displayed, press button SW3 every two seconds 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 5-4.3 and Table 5-4.1.
Figure 5-4.3: Button SW3 on main PCB
66