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Troubleshooting
Service manual
155
REYQ8~20+REMQ5U7Y1B
VRV IV+ Heat Recovery
ESIE18-15B – 2020.05
Trigger
Effect
Reset
Inverter PCB A6P detects
DC voltage cannot reach
or maintain minimum
500 V DC.
Unit will stop operating.
Power reset at outdoor
unit.
No zero cross is detected
by main PCB through at
least 10 seconds.
Abnormal voltage drop is
detected by DC voltage
detection circuit.
Abnormal voltage rise is
detected by over voltage
detection circuit.
To solve the error code
INFORMATION
It is recommended to perform the checks in the listed order.
1
Check if the power supply wiring is correct. See
356].
Possible cause:
Incorrect power supply wiring.
2
Perform a check of the noise filter PCB A5P. See
Possible cause:
Faulty noise filter PCB A5P.
3
Perform a check of the inverter PCB A6P. See
Possible cause:
Faulty inverter PCB A6P.
4
Check the wiring between the PCB's. See
Possible cause:
Faulty wiring between PCB's.
INFORMATION
If all procedures listed above have been performed and the problem is still present,
contact the helpdesk.
2.3.148 U3-02 – Test run interrupted manually
Trigger
Effect
Reset
Test run interrupted
manually by user on main
PCB.
Warning.
Perform test run.
Leak detection or
refrigerant amount check
has NOT been performed.
To solve the error code
INFORMATION
It is recommended to perform the checks in the listed order.
Summary of Contents for VRV IV+
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