Acond PRO-N - Page 37

Heat pumps AIR / WATER
Operation manual 35
Cod
e
ALARM
Cause
Deletion
P99
BLOCKED
Payment confirmation code has
expired
Enter the code
confirming payment on
the main page
A01
HIGH PRESSURE
Activation of the pressure switch on
the cooling circuit
Low or no water flow through plate
heat exchanger
Clogged water filter
Closed tap on water circuit
Clean the water filter
Increase the water flow
through the plate heat
exchanger and thus
reduce the outlet water
temperature
Check the permeability
of the heating circuit
A02
LOW PRESSURE
Activation of the pressure switch on
the cooling circuit
Misaligned defrosting
Outdoor temperature too low for
heat pump operation
Refrigerant leakage
Call Service
A03
COMPRESSOR
RUNNING, PHASE
SEQUENCE
Compressor not running - electrical
fault, balancing problems of the
power grid (undervoltage at some
stage)
Check that the
compressor is rotating. If
not, call service.
A04
LOW EARTH
COLLECTOR
TEMPERATURE
Low temperature
Call Service
A05
HIGH TEMP OF
EVAPORATOR
Evaporator temperature during
defrosting or even after defrosting
has finished exceeded the set value
of parameter AL11
Call Service
A06
LOW TEMP OF
EVAPORATOR
Evaporator temperature has
dropped below parameter AL14
Call Service
A07
ANTI-FREEZE
PROTECTION
Too low water temperature in plate
exchanger
Call Service
A08
service water
heating
Maximum service water heating time
expired
Check service water
circuit venting
A12
Defrost
Unit did not freeze sufficiently
Check the frost on the
outdoor unit.
A13
LARGE NUMBER
OF DEFREEZES
Defrost switches too often
Check that the fan
propeller rotates
Contact service