REMKO WLT 25 - Manual (Page 14)

Troubleshooting and customer service
The unit and components are manufactured using state-of-the-art production methods and tested several times
to verify their correct function. However, if malfunctions should occur, please check the functions as detailed
in the list below. With systems for cooling or heating with indoor units, chillers or heating systems the chapter
"Troubleshooting and customer service" in all operating manuals must also be observed. Please inform your
dealer if the unit is still not working correctly after all function checks have been performed!
Alarm Possible cause Checks Remedial measures
The unit does
not start or switches
itself off.
Power failure, low voltage, main
fuse defective / main switch
turned off.
Does all other electrical equipment
function correctly?
Check the voltage and if
necessary, wait for it to come
back on.
Power supply damaged. Does all other electrical equipment
function correctly?
Repair by certified service centre.
Waiting time after turn on too
short.
Have approx. 5 minutes
elapsed since the restart?
Plan for longer waiting period.
Operating temperature fallen
below / exceeded.
Are the fans in the indoor unit and
outdoor unit working correctly?
Observe temperature ranges
of indoor unit and outdoor unit.
Power surge due to thunderstorm. Have there been lightning strikes
in the area recently?
Switch off the mains breaker and
switch it back on. Inspection by
certified service centre.
External condensate pump alarm. Did the pump shut down due to
a fault?
Check or clean the pump,
if necessary.
The unit does not respond to
the remote control.
Transmission distance too large /
receiving problem.
Does the indoor unit beep when
pressing a key?
Reduce the distance to less
than 6 m and change location.
Remote control is defective. Is the unit running in manual
mode?
Replace remote control.
Receiver and transmitter are
exposed to too much sun
exposure.
Does it function correctly in the
shade?
Shade the transmitter and receiver.
Electromagnetic fields disrupt the
transmission.
Does it function after removing
potential sources of interference?
Signal is not transmitted
when interference sources are
operational.
Key of remote control stuck /
double key actuation.
Does the “Send” symbol appear
on the display?
Release the key / press only one
key.
Batteries of remote control are flat. Have new batteries been inserted?
Is the display incomplete?
Insert new batteries.
The unit is running but
only provides reduced
or no cooling or heating.
Valve assembly jammed,
not working, not yet fully
activated.
Is the electrical power present at
the valve head or has the time
period of 3 minutes after the
activation passed?
Have the valve head replaced
or wait for time period to pass.
Filter is dirty / air inlet / outlet
opening is blocked by debris.
Have the filters been cleaned? Clean filters.
Windows and doors open.
Heating/cooling output has
increased.
Have structural /
usage modifications
been made?
Close windows and doors / install
additional systems.
Cooling mode is not set. Does the cooling symbol appear
on the display?
Correct the settings for the unit.
Inlet temperature in cooling mode
too high.
Is the inlet temperature ca.
+ 5 ...+ 10 °C and is the circulation
pump working?
Reduce inlet temperature.
Inlet temperature in heating mode
too low.
Is the inlet temperature ca.
+ 25 ...+ 45 °C and is the
circulation pump working?
Increase inlet temperature.
Condensate discharge on unit.
Drain pipe of collector reservoir
plugged / damaged.
Can the condensation drain off
without any obstruction?
Clean the drainage pipe and
collection container.
External condensation pump or
floater defective.
Is the collection tray full of water
and the pump not running?
Have pump replaced by certified
service centre.
Non-discharged condensate is in
the condensate drainage line.
Has the condensate drainage line
been laid on an incline and is it
unobstructed?
Route the condensate drainage line
downward or clean it.
Condensate cannot be discharged. Are the condensate drainage lines
unblocked and is there a steady
incline? Are the condensate pump
and liquid level switch functioning
correctly?
Route the condensate drainage line
downward or clean it. If the liquid
level switch or the condensate
pump is defective, have them
replaced.
Malfunctions
REMKO WLT
14