Accorroni GREEN 220, Installation Manual

Page: 30 / 40

CALIDO1
DHW heat pump with tank
30
11.6 UNIT MALFUNCTION AND ERROR CODES
When an error occurs or the protection mode is set automatically, the circuit board and the wired controller will both display the error message.
Protection/
Malfunction
Error code LED indicator Possible reasons Corrective actions
Standby Off
Normal operation On
Lower tank temperature
sensor fault
P1
●
(1 flashes 1 off)
1) Sensor not connected
2) Short-circuited sensor
1) Check the sensor con -
nection
2) Replace the sensor
Upper tank temperature
sensor fault
P2
●
(2 flashes 1 off)
1) Sensor not connected
2) Short-circuited sensor
1) Check the sensor con -
nection
2) Replace the sensor
Evaporator coil tempera -
ture sensor fault
P3
●
(3 flashes 1 off)
1) Sensor not connected
2) Short-circuited sensor
1) Check the sensor con -
nection
2) Replace the sensor
Intake gas temperature
sensor fault
P4
●
(4 lampeggi 1 off)
1) Sensor not connected
2) Short-circuited sensor
1) Check the sensor con -
nection
2) Replace the sensor
Ambient temperature sen-
sor failure
P5
●
(5 flashes 1 off)
1) Sensor not connected
2) Short-circuited sensor
1) Check the sensor con -
nection
2) Replace the sensor
Domestic hot water/solar
water circulation tempera -
ture sensor failure
P6 Off
1) Sensor not connected
2) Short-circuited sensor
1) Check the sensor con -
nection
2) Replace the sensor
Remote signal status ON/
OFF
P7 Off
When the reote signal is
on, P7 is not displayed on
the controller, when thew
signal is off, P7 is displayed.
This is not an error code,
but only the status of the
remote on/off signal.
High T6 temperature warn -
ing
P8 Off
1) High T6 temperature.
2) T6 sensor mot working
properly
1) P8 appears at 125°C and
disappears at 120°C
2) Check and replace the
sensor if necessary
High pressure protection
(Pressure switch HP)
E1
●
(6 flashes 1 off)
1) Air inlet temperature
too high
2) Low water in the tank
3) EXV blocked
4) To much refrigerant
5) HP pressure switch
faulty
6) Excessive liquid in the
cooling system
1) Check if the air inlet
temperature is above the
operating limit
2) Check that the tank is
full f water
3) Replace the EXV
4) Discharge some refrig -
erant
5) Replace the pressure
switch
6) Discharge and recharge
the refrigerant
Low pressure protection
(Pressure switch LP)
E2
●
(7 flashes 1 off)
1) Inlet aire temperature
too low
2) EXV blocked
3) Not enough refrigerant
4) LP pressure switch faulty
5) Fan not working
1) Check if the air inlet
temperature is below the
opeating limit
2) Replace the EXV
3) Charge some refrigerant
4) Replace the flow switch
5) Check that the fan is
working togheter with the
compressor. Otherwise the
fan may be faulty
High temperature protec -
tion (Thermostat T85°C)
E3
●
(8 flashes 1 off)
1) High tank water tem -
perature
2) Thermostat is faulty
1) If the fan temperature
exceeds 85°C, the pressure
switch opens the contact
and the resistor switches
off for protection. After
the water returns to nor-
mal temperature values,
the protection resets itself.
2) Replace the thermostat
Flow switch E5
●
(9 flashes off)
Water fow rate not de-
tected:
1) Pump not powered
2) Pump malfunction
3) Dirty water filter
4) Flow switch malfunc -
tioning
1) Check the power supply
of the pump
2) Check the electrical con -
nections of the pump and
the direction of rotation
of the motor. Replace the
pump if necessary
3) Clean the filter
4) Check the connections
and the correct operation
of the flow switch
Defrost Indicates defrosting (continuous flashes)
Communication error E8 On