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Troubleshooting
Service manual
22
REYQ8~20+REMQ5U7Y1B
VRV IV+ Heat Recovery
ESIE18-15B – 2020.05
2.3 Error based troubleshooting
2.3.1 A3-01 – Multi BS Unit PCB Abnormality
Trigger
Effect
Reset
Open circuit detected on
X15A connector of branch
selector box.
Indoor units connected to
this branch selector box
will stop running
Auto reset when short
circuit is detected on
X15A connector of branch
selector box.
To solve the error code
INFORMATION
It is recommended to perform the checks in the listed order.
1
Locate the branch selector box by checking the indoor unit remote controllers
showing A3‑01 error. The branch selector box connected to the indoor unit(s)
that show A3‑01 error is subject to further investigation.
NOTICE
Other indoor units in the circuit will show U9 error. This means “There is an error in
the circuit but it’s not the unit that shows U9”.
2
Check if the power supply is conform with the regulations. See
356].
Possible cause:
▪
Faulty or disturbance of the power supply (imbalance >10%),
▪
Power drop,
▪
Short circuit.
3
Check if connector X15A is short circuited with a connector. Check if this
connector is firmly connected.
Possible cause:
X15A connector loose or NOT connected.
4
If error does NOT resolve even after X15A on branch selector box PCB is short
circuited, perform a check of the branch selector box PCB.
Possible cause:
Faulty branch selector box PCB.
INFORMATION
If all procedures listed above have been performed and the problem is still present,
contact the helpdesk.
2.3.2 E1-01 – Outdoor unit main PCB A1P error
Trigger
Effect
Reset
Main PCB fails reading/
writing memory (EEPROM
error).
Unit will stop operating.
Manual reset via user
interface.
Summary of Contents for VRV IV+
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