Drain Back Flow - Daikin VAM350J8VEB Service Manual

3.2.16 AF-00 – Drain back flow
VAM350~2000J8VEB + EKVDX32~100A2VEB
VRV system air conditioner
ESIE22-07 – 2022.02
Possible cause: Faulty expansion valve.
6 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.
EKVDX-A units
Trigger
During drain pump OFF,
float switch opens, drain
pump recovery operation
starts for 10 minutes.
When drain pump
recovery restarted
5 times, error code AF-00
is displayed.
To solve the error code
INFORMATION
It is recommended to perform the checks in the listed order.
1 Check for excess water level in the drain pan. Check drain connector to the
common drain pipe, and make sure minimum height is respected. Empty the
drain pan and correct installation of drain piping as needed. See indoor unit
installation manual for more detailed information.
Possible cause: Excess water in the drain pan and/or incorrect installation of
drain piping. Drain water from other operating indoor unit may run into the
indoor unit with non‑operating drain pump.
2 Perform a check of the float switch. See Float switch.
Possible cause: Faulty float switch.
3 Perform a check of the drain pump. See Drain pump.
Possible cause: Faulty drain pump.
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.
Effect
Unit will stop thermostat
during drain pump
recovery operation.
draft – 07/02/2022 15:12
3 | Troubleshooting
Reset
Auto reset.
Service manual
33