19 Troubleshooting
Installation and operation manual
41
BS4~12A14AJV1B
VRV 5 branch selector unit
4P670163-1 – 2022.02
▪ Make sure that the user has the printed documentation and ask
him/her to keep it for future reference. Inform the user that he can
find the complete documentation at the URL mentioned earlier in
this manual.
▪ Explain the user how to properly operate the system and what to
do in case of problems.
▪ Show the user what to do for the maintenance of the unit.
19
Troubleshooting
19.1
Overview: Troubleshooting
Before troubleshooting
Carry out a thorough visual inspection of the unit and look for
obvious defects such as loose connections or defective wiring.
19.2
Precautions when troubleshooting
WARNING
▪ When carrying out an inspection on the switch box of
the unit, ALWAYS make sure that the unit is
disconnected from the mains. Turn off the respective
circuit breaker.
▪ When a safety device was activated, stop the unit and
find out why the safety device was activated before
resetting it. NEVER shunt safety devices or change
their values to a value other than the factory default
setting. If you are unable to find the cause of the
problem, call your dealer.
DANGER: RISK OF ELECTROCUTION
WARNING
Prevent hazards due to inadvertent resetting of the thermal
cut-out: power to this appliance MUST NOT be supplied
through an external switching device, such as a timer, or
connected to a circuit that is regularly turned ON and OFF
by the utility.
DANGER: RISK OF BURNING/SCALDING
19.3
Solving problems based on error
codes
If the BS unit runs into a problem, the user interface of the indoor
unit(s) connected to the BS unit displays an error code. It is
important to understand the problem and to take measures before
resetting an error code. This should be done by a licensed installer
or by your local dealer.
This chapter gives you an overview of the most possible error codes
and their descriptions as they appear on the user interface.
INFORMATION
See the service manual for:
▪ The complete list of error codes
▪ A more detailed troubleshooting guideline for each
error
19.3.1
Error codes: Overview
In case other error codes appear, contact your dealer.
Code
Description
The R32 sensor has detected a refrigerant leak in the
BS unit.
/
Safety system error (leak detection)
BS unit drain water abnormality (X15A is opened)
BS unit R32 sensor malfunction
Less than 6 months before the BS unit R32 sensor
end of lifetime
BS unit R32 sensor end of lifetime
Malfunction of the BS unit's PCB
BS unit damper malfunction
Malfunction of the BS unit's electronic expansion
valve
Malfunction of the BS unit's back-up/capacitor PCB
No power from the BS unit's back-up/capacitor PCB
BS unit power supply failure
20
Disposal
NOTICE
Do NOT try to dismantle the system yourself: dismantling
of the system, treatment of the refrigerant, oil and other
parts MUST comply with applicable legislation. Units
MUST be treated at a specialised treatment facility for
reuse, recycling and recovery.
21
Technical data
▪ A
subset
of the latest technical data is available on the regional
Daikin website (publicly accessible).
▪ The
full set
of latest technical data is available on the Daikin
Business Portal (authentication required).
21.1
Wiring diagram
The wiring diagram is delivered with the unit, located at the
inside of the service cover.
For applied parts and numbering, see the wiring diagram on the unit.
Part numbering is by Arabic numbers in ascending order for each
part and is represented in the overview below by "*" in the part code.
Symbol
Meaning
Symbol Meaning
Circuit breaker
Protective earth
Connection
Protective earth (screw)
,
Connector
A
,
Rectifier
Earth
Relay connector
Field wiring
Short-circuit connector
Fuse
Terminal
INDOOR
Indoor unit
Terminal strip
OUTDOOR
Outdoor unit
Wire clamp
Residual current
device
