Error Based Troubleshooting; A0-00 - External Protection Device Activated - Daikin VAM350J8VEB Service Manual

3.2 Error based troubleshooting

3.2.1 A0-00 – External protection device activated
VAM350~2000J8VEB + EKVDX32~100A2VEB
VRV system air conditioner
ESIE22-07 – 2022.02
EKVDX-A units
Trigger
T1‑T2 input is ON and
field setting 22-1=3.
To solve the error code
INFORMATION
It is recommended to perform the checks in the listed order.
1 Check if the field setting 22-1 is correctly set according to the following wiring
situations on T1‑T2 of X1M terminal of the indoor unit. See
4
settings" [ 83]. Correct as needed.
▪ No wiring connected: Field setting 22-1=1
▪ Wiring connected to a window or door contact: Field setting 22-1=1
▪ Wiring connected to a remote operation switch: Field setting 22-1=2
▪ Wiring connected to an external protection device (fire alarm, R32 leak
detection sensor,...): Field setting 22-1=3
Possible cause: Incorrect field setting.
2 If wiring connected to T1‑T2 of X1M terminal of the indoor unit, check correct
connection and continuity of the wiring. See
Possible cause: Faulty or damaged wiring between T1‑T2 of X1M terminal of
the indoor unit and external device.
3 If wiring is connected, measure on T1‑T2 of X1M terminal of the indoor unit to
check for the correct functioning of the external device:
▪ Wiring connected to a window or door contact: Open circuit (unit continues
previous operation, remote controller enabled) when window / door is
closed, short‑circuit (forced stop, remote controller buttons disabled) when
window / door is open. Replace window / door contact if incorrect
measurement.
Possible cause: Faulty window / door contact.
▪ Wiring connected to a remote operation switch: Open circuit when OFF
command to the unit, short‑circuit when ON command to the unit. Replace
remote operation switch if incorrect measurement.
Possible cause: Faulty remote operation switch.
▪ Wiring connected to an external protection device (fire alarm, R32 leak
detection sensor,...): Short‑circuit when normal operation, open circuit
(forced stop with error code A0-00) when external protection device is
active. If open circuit is detected, check and eliminate the root cause why
the protection device is activated. Do NOT try to run the unit until the root
cause is eliminated. If NO root cause was found, protection device may be
faulty. Replace as needed.
Possible cause: Root cause of external protection device activation or faulty
external protection device.
4 Perform a power reset. If the error disappears and is raised again after a
while, check for the presence of an external source causing electrical noise.
See External factors.
Effect
Unit will stop operating
"5.2 Wiring
draft – 07/02/2022 15:12
3 | Troubleshooting
Reset
Auto reset.
"5.8 Field
4
diagram" [ 63].
Service manual
21