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Troubleshooting
Service manual
28
VAM350~200 EKVDX32~100A2VEB
VRV system air conditioner
ESIE22-07 – 2022.02
3.2.9 A6-22 – Unstable fan rpm
VAM-J8 units
Trigger
Effect
Reset
Fan PCB detects irregular
fan rpm signals.
Unit will NOT stop
operating.
Auto reset.
To solve the error code
INFORMATION
It is recommended to perform the checks in the listed order.
1
Check the power supply to the indoor unit. See Power supply.
Possible cause:
▪
Faulty or disturbance of the power supply (imbalance),
▪
Phase missing,
▪
Power drop,
▪
Short circuit.
2
Perform a check of the indoor unit fan motors. See Indoor unit fan motor.
Possible cause:
Faulty indoor unit fan motor.
3
Perform a check of the indoor unit fan PCBs. See Indoor unit fan PCB.
Possible cause:
Faulty indoor unit fan PCB.
4
Perform a check of the indoor unit main PCB. See Indoor unit PCB.
Possible cause:
Faulty indoor unit main PCB.
INFORMATION
If all procedures listed above have been performed and the problem is still present,
contact the helpdesk.
3.2.10 A6-28 – Airflow rate below critical threshold
VAM-J8 units
Trigger
Effect
Reset
The airflow is lower than
the legal limit.
VAM and EKVDX unit will
stop operating. Outdoor
unit connected to EKVDX
unit will stop operating.
Power reset.
To solve the error code
INFORMATION
It is recommended to perform the checks in the listed order.
1
This error can ONLY occur if VAM-J8 and EKVDX-A are installed together
where field settings are 28‑10=2 and 29‑15=2. If it’s a standalone VAM-J8
make sure to perform correct field settings. See
83].
Possible cause:
Incorrect field settings.
2
Check that the ducting is compliant with the installation limits. See installer
reference guide.
draft – 07/02/2022 15:12