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8 Troubleshooting

Installation and operation manual

RXYTQ8~16U7YF

VRV IV+ heat pump for high ambient temperatures

4P546223-1B – 2020.10

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.

If the system goes into
fan only operation, but
as soon as it goes into
heating or cooling
operation, the system
stops.

▪ 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 user interface display shows

(time to clean the air filter). (Refer to

"7 Maintenance and service"

[

9] and

"Maintenance" in the indoor unit manual.)

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 (refer

to "Maintenance" in the indoor unit
manual).

▪ 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.

If after checking all above items, it is impossible to fix the problem
yourself, contact your installer and state the symptoms, the complete
model name of the unit (with manufacturing number if possible) and
the installation date (possibly listed on the warranty card).

8.1

Error codes: Overview

In case a malfunction code appears on the indoor unit user interface
display, contact your installer and inform the malfunction code, the
unit type, and serial number (you can find this information on the
nameplate of the unit).

For your reference, a list with malfunction codes is provided. You
can, depending on the level of the malfunction code, reset the code
by pushing the ON/OFF button. If not, ask your installer for advice.

Main code

Contents

External protection device was activated

EEPROM failure (indoor)

Drain system malfunction (indoor)

Fan motor malfunction (indoor)

Swing flap motor malfunction (indoor)

Expansion valve malfunction (indoor)

Drain malfunction (indoor unit)

Filter dust chamber malfunction (indoor)

Capacity setting malfunction (indoor)

Transmission malfunction between main PCB and sub
PCB (indoor)