18 Troubleshooting
Installer and user reference guide
71
SERHQ020~0 SEHVX20~64BAW
Split packaged air-cooled water chiller
4P508020-1A – 2018.01
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 properly operate except for the above
mentioned cases and none of the above mentioned malfunctions is
evident, investigate the system according to the following
procedures.
Malfunction
Measure
The remote controller
display is blank.
▪ 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.
▪ Check if the benefit kWh rate power
supply is active.
An error code is
displayed on the
remote controller.
Consult your local dealer. Refer to
"10.2 Error codes: Overview" on page 48
for a detailed list of error codes.
The schedule timer
works, but the
programmed actions
are executed at the
wrong time.
Check if the clock and the day of the week
are set correctly, and correct if necessary.
The schedule timer is
programmed, but does
not work.
In case is not displayed, push
to
enable the schedule timer.
Capacity shortage.
Consult your local dealer.
Temperature values on
the remote controller
are displayed in °F
instead of in °C.
To switch the display between °C and °F,
push
and
simultaneously for
5 seconds. The default temperature display
is in °C.
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
"17 Maintenance and service" on
page 69
.)
Malfunction
Measure
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
"17 Maintenance and service" on
▪ 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).
18.1
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
EEPROM failure (indoor unit)
Water circuit malfunction (indoor unit)
Expansion valve malfunction (indoor unit)
Water system warning (indoor unit)
Capacity setting malfunction (indoor unit)
ACS communication malfunction (indoor unit)
Refrigerant liquid thermistor malfunction (indoor unit)
Returning water thermistor malfunction (indoor unit)
Heating leaving water thermistor malfunction (indoor
unit)
User interface thermistor malfunction (indoor unit)
High pressure switch was activated (indoor unit)
Low pressure malfunction (indoor unit)
Refrigerant suction sensor (indoor unit)
Refrigerant charging aborted (outdoor unit)
Automatic refrigerant charging related (outdoor unit)
Refrigerant tank empty (outdoor unit)
Refrigerant tank empty (outdoor unit)
Refrigerant tank empty (outdoor unit)
Reversed power supply phase malfunction (indoor
unit)
Insufficient supply voltage (indoor unit)
Two user interfaces are connected and both are set to
main (indoor unit)
