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Troubleshooting
Installer and user reference guide
124
R R8T7V1B
VRV IV heat pump for indoor installation
4P499898-1B – 2021.12
22 Troubleshooting
In this chapter
Solving problems based on error codes................................................................................................................................. 124
22.3.1
22.1 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.
22.2 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
22.3 Solving problems based on error codes
In case of a displayed malfunction code, perform correcting actions as explained in
the malfunction code table.
After correcting the abnormality, press BS3 to reset the malfunction code and retry
operation.
