Malfunction
Possible cause
Check
Remedial measures
The unit works
at reduced
or no cooling/heating
capacity.
Valve assembly jammed, not
working, not yet fully activated.
Is electrical power present
at the valve head or has
the time period of 3 minutes
after 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 /
heat or cold load was 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 unit's settings.
Inlet temperature in cooling
mode too high.
Is the inlet temperature approx.
+ 5 - + 10 °C and is the
circulation pump working?
Reduce inlet temperature.
Inlet temperature in heating
mode too low.
Is the inlet temperature approx.
+ 24 - + 45 °C and is the
circulation pump working?
Increase inlet temperature.
Condesate is leaking
out of the unit.
Collector reservoir drain pipe
blocked / damaged.
Can the condensate 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.
Condensation has collected
in the condensate drainage line.
Is there an incline
on the condensate drainage
line and is it clear?
Route the condensate drainage
line with an incline and 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 with an incline and clean it.
Replace the faulty liquid level
switch or condensate pump.
Float is stuck or jammed
due to excessive dirt.
Are the LEDs on the receiver
unit of the indoor unit flashing?
Have it cleaned by specialist
firm.
Malfunction indicated by flashing code
H
(red)
M
(yellow)
L
(green) Cause
Required action
On
Fan at max. speed
Normal operating condition
On
Fan at medium speed
Normal operating condition
On
Fan at low speed
Normal operating condition
Flashes
Heating mode: Warm-up phase, fan not active, heat exchanger
temperature <28/36°C (corresponds to DIP3, SW5)
Wait approx. 1 minute
Flashes
Heating mode: Cool-down phase, fan active
(only for DIP3 configuration, SW7 = ON)
Wait approx. 1 minute
On
Flashes
Flashes Register probe faulty / tripped
Contact specialist dealer
Flashes
Cooling mode: Indoor unit anti-freeze protection <2°C
for 10 minutes
Increase the medium
temperature
Flashes
On
Heat exchanger/anti-freeze protection probe >75°C
Reduce the medium temperature
Flashes
Flashes Heating mode: Overheating protection for indoor unit
Reduce the medium temperature
Flashes
Flashes Indoor unit ambient air probe faulty/tripped
Contact specialist dealer
Flashes Flashes
Flashes Condensation pump liquid level switch faulty/tripped
Contact specialist dealer
On
Flashes
Window contact tripped / system in standby
Open the enabling contact
(terminals 3 + 4)
REMKO KWD EC series
20
