11
Troubleshooting, fault analysis and customer service
11.1 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 alarms should occur, please check the functions as detailed
in the list below. For systems with an indoor unit and outdoor unit, refer to the chapter "Troubleshooting and
customer service" in both operating manuals. Please inform your dealer if the unit is still not working correctly
after all function checks have been performed!
Operational malfunctions
Malfunction
Possible causes
Checks
Remedial measures
The unit does not
start or switches
itself off
Power failure, under-
voltage,
Does all other electrical
equipment function cor-
rectly?
Check the voltage and if
necessary, wait for it to
come back on
Defective mains fuse /
main switch turned off
Are all lighting circuits
functioning correctly?
Replace mains fuse,
switch main switch on
Damaged power supply
Does all other elec. equip-
ment function correctly?
Repair by specialist firm
Wait time after switching
on is too short
Does a restart occur after
around 5 minutes?
Schedule longer wait times
Operational temperature
range too low/exceeded
Are the fans on the units
still working?
Observe temperature
ranges
Over-voltage or under-
voltage at times
Check by specialist firm
Switch the system off and
back on
Condensate pump's
switch-off contact opened
Is the external condensa-
tion pump on the indoor
unit showing "Malfunc-
tion"?
Clean the condensate
pump's outlet. Have the
pump replaced
The unit works at
reduced or no
cooling capacity.
Refrigerant piping
swapped
Are the injection pipes and
suction pipes of circuits A,
B and C correspondingly
connected?
Rectification by specialist
firm
Electrical control lines
swapped
Are the control pipes and
refrigerant pipes of circuits
A, B and C correspond-
ingly connected?
Rectification by specialist
firm
Air inlet and / or air outlet
opening blocked by debris.
Debris in air inlet and air
outlet area?
Clean the fins. Reduce the
air resistance.
Thermal/wind load has
increased.
Have structural / usage
modifications been made?
Reduce the thermal/wind
loads by taking appro-
priate measures.
No heat output possible.
Is the outdoor unit's fan
working?
Check the fan / winter fan
speed control.
Leaking cooling cycle
Are there signs of severe
frost on the large shut-off
valve?
Repair by specialist firm.
REMKO series SKT
36
