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Troubleshooting
Installer and user reference guide
125
R R8T7V1B
VRV IV heat pump for indoor installation
4P499898-1B – 2021.12
INFORMATION
If a malfunction occurs:
▪
In case of 5 HP: The error code is displayed on the user interface of the indoor
unit.
▪
In case of 8 HP: The error code is displayed on the compressor unit's 7‑segments
display and on the user interface of the indoor unit.
INFORMATION
If a malfunction occurs, the error code is displayed on the outdoor unit's 7‑segments
display and on the user interface of the indoor unit.
In case of 8 HP: The error code on the compressor unit will indicate a main
malfunction code and a sub code. The sub code indicates more detailed
information about the malfunction code. The main code and sub code will be
displayed intermittent (with an interval of 1 second).
Example:
▪
Main code:
▪
Sub code:
22.3.1 Error codes: Overview
In case of 5 HP:
Main code
Cause
Solution
▪
Heat exchanger fan malfunction.
▪
Drain pump feedback contact is open.
In the heat exchanger unit:
▪
Check connection on PCB: A1P (X15A)
▪
Check connection on terminal block (X2M)
▪
Check the fan connectors.
▪
The stop valves of the compressor unit are
left closed.
▪
Refrigerant overcharge
▪
Open the stop valves on both the gas and
liquid side.
▪
Recalculate
the
required
amount
of
refrigerant from the piping length and correct
the refrigerant charge level by recovering any
excessive refrigerant with a refrigerant
recovery machine.
▪
The stop valves of the compressor unit are
left closed.
▪
Insufficient refrigerant
▪
Open the stop valves on both the gas and
liquid side.
▪
Check if the additional refrigerant charge has
been finished correctly. Recalculate the
required amount of refrigerant from the
piping length and add an adequate amount of
refrigerant.
Electronic expansion valve malfunction
Heat exchanger unit: (Y1E) - A1P (X7A)
Compressor unit: (Y1E) - A1P (X22A)
Check connection on PCB or actuator.
