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Malfunction
Fault Code Possible cause Check Remedy
The unit
does not
start or
switches
itself off
autono-
mously
Power failure
Is all other electrical equipment
functioning?
Check the voltage and wait for
reactivation.
Unit fuse / main disconnecter
switched off
Does the unit have power?
Switch on the unit fuse / main
switch.
Waiting period too short Is the compr. symbol flashing?
Plan for a longer waiting
period.
C(n)Mn
The maintenance interval
of compressor (n) has been
reached
Have the compressor mainte-
nance performed by a specialist
company
Reset the operating hours after
the maintenance interval.
AEP(n)
The maintenance interval of
the circulation pump has been
reached
Have the circulation pump
maintenance performed by a
specialist company
Reset the operating hours after
the maintenance interval.
APS /
ASPh
Incorrect electrical direction of
rotation of the mains supply
Has the phase sequence relay
switched through?
Change the direction of rota-
tion.
StbY
The controller is in standby
mode
Does the compressor symbol
light up?
Apply voltage and
select the operating mode.
Return temperature or param-
eter setting incorrect
Check the setting. Change the settings.
OFF No fault
Is the "external enable" ena-
bling contact closed?
Close / open
contact used.
AP1 Defective sensor, medium inlet Check of resistor PB1 Replace the defective sensor.
AP2
Defective sensor, medium
outlet
Check of resistor PB2 Replace the defective sensor.
AP 3-6 Defective transm. condensation Check of transmitter PB Replace the defective transmit..
AP
Defective sensor, outdoor tem-
perature
Check of resistor PB Replace the defective sensor.
Atr1
Cabled remote control not con-
nected
Check of the connection / line
of the cabled remote control
If missing, set Parameter CF 74
from "1" to "0"
b(n)HP
High-pressure fault
Circuit n
Are the fans rotating?
Is the air inlet of the condenser
free of objects?
Have it checked by
a specialist company.
b(n)LP
Low-pressure fault
Circuit n
Is the pressure in the cooling
circuit OK?
Have it checked by
a specialist company.
b(n)hP Overtemperature of condenser
Are the fans rotating?
Is the air inlet of the condenser
free of objects?
Have it checked by
a specialist company.
b(n)hP
Undertemperature of condenser
Circuit n
Have the operating tempera-
tures been exceeded?
Decommission the system.
b(n)AC
b(n)AH
Anti-frost protection has
reacted
Circuit n
Is the temperature of the inlet
flow 4°C or lower?
Increase the return temperature,
increase the medium volume
flow rate
.
AEFL
Differential pressure monitor /
flow monitor
reacted
Are the following items OK:
- Medium volume flow rate
- No air in the medium
lines
- Circulation pump capacity
- Switches the differential pres-
sure /
flow monitor
- Shut-off valves open
- Medium pressure too low
Have it checked by
a specialist company.
Atr1
Cabled remote control not
configured or connected
Does the cabled remote control
function perfectly?
Have the remote control and/
or parameters checked by a
specialist company.
AEt1,
b(n)tF,
A(n)tr,
b(n)HP
APS /
ASPh
Control fuse F1 230V triggered Has fuse F1 triggered?
Have the fuse replaced by a
specialist company.
19
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