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Operation and Maintenance
Envistar Top 04-21
DSET.220501.07.en
Continuous product development may give rise to specification changes without notice.
7 Alarm management and troubleshooting
For units with control equipment (code MX), alarm information can be read on
the Climatix display.
For units without control equipment (code UC, MK, US), alarm information can
be read on the Carel display.
Press the alarm symbol to view alarms.
7.1 Cooling unit (TEC-R, TEC-M) size 06-10, (TEC-M) size 06-10
Troubleshooting in the event of an alarm
Inspection
Possible cause
Corrective action
Is Carel "High pressure
switch (16)" displayed?
YES
⇒
No or too low air flow across the
condenser
Check the air flow across the
condenser. Reset the pressure
switch manually.
Defective high pressure switch
Check/replace
NO
⇓
Is Carel alarm "LOP"
displayed?
YES
⇒
Insufficient refrigerant volume
Look for leakage, seal the leak and
top up with refrigerant
No or too low air flow across
evaporator
Check/adjust the flow
Defective expansion valve or low
pressure control
Check/replace
NO
⇓
Is Carel alarm with figu-
res (1)-(15), (17)-(29) dis-
played?
YES
⇒
Phase failure/voltage failure
Check incoming voltage (phase
and neutral. Reset the frequency
inverter by switching off the voltage
for 1 minute or more. Check that
the compressor is running without
dissonance.
NO
⇓
Contact support
Overload/defective stepless com-
pressor
Reset the frequency inverter by
switching off the voltage for 1 minute
or more. Check that the compressor
is running without dissonance.
