18
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Troubleshooting
Installer and user reference guide
69
FXFQ20~125BVEB
VRV system air conditioner
4P561452-1B – 2021.07
18 Troubleshooting
If one of the following malfunctions occur, take the measures shown below and
contact your dealer.
WARNING
Stop operation and shut off the power if anything unusual occurs (burning smells
etc.).
Leaving the unit running under such circumstances may cause breakage, electric
shock or fire. Contact your dealer.
The system MUST be repaired by a qualified service person.
Malfunction
Measure
If a safety device such as a fuse, a breaker or an
earth leakage breaker frequently actuates or the
ON/OFF switch does NOT properly work.
Turn OFF the main power
switch.
If water leaks from the unit.
Stop the operation.
The operation switch does NOT work well.
Turn OFF the power supply.
If the user interface display indicates the unit
number, the operation lamp flashes and the
malfunction code appears.
Notify your installer and report
the malfunction code.
If the system does NOT operate properly except for the above mentioned cases
and none of the above mentioned malfunctions is evident, investigate the system
in accordance with the following procedures.
Malfunction
Measure
If the system does not
operate at all.
▪
Check if there is no power failure. Wait until
power is restored. If power failure occurs during
operation, the system automatically restarts
immediately after power is restored.
▪
Check if no fuse has blown or breaker is activated.
Change the fuse or reset the breaker if necessary.
The system operates but
cooling or heating is
insufficient.
▪
Check if air inlet or outlet of outdoor or indoor
unit is not blocked by obstacles. Remove any
obstacles and make sure the air can flow freely.
▪
Check if the air filter is not clogged (see
63]).
▪
Check the temperature setting.
▪
Check the fan speed setting on your user
interface.
▪
Check for open doors or windows. Close doors and
windows to prevent wind from coming in.
▪
Check if there are too many occupants in the room
during cooling operation. Check if the heat source
of the room is excessive.
▪
Check if direct sunlight enters the room. Use
curtains or blinds.
▪
Check if the air flow angle is proper.
