6 Troubleshooting
Depending on whether the fault comes from the outdoor
unit or the hydraulic unit, the fault may be indicated by
the digital display or the diode on the interface cards.
6 .1 Faults displayed on the hydraulic unit
Faults or breakdowns on the hydraulic unit are indicated
by the display on the user interface.
The display shows the
symbol.
Press the
key for more details on the origin of the
fault.
When the error has been resolved, the faults are re-
initialised at zero automatically.
Hydraulic unit
: Fault visible on the digital display.
Error number Error description
Error location
Heat pump
operation despite
the error
-
No connection.
Failure to comply with room
thermostat's polarity.
No
10
Outdoor sensor.
B9
Yes with OT = 0 °C
33
Heat pump initial temperature sensor error.
B21
Yes
44
Heat pump return temperature sensor error.
B71
Yes
50
DHW temperature sensor.
B3
Yes
60
Ambient temperature sensor 1.
Yes
65
Ambient temperature sensor 2.
Yes
105
Maintenance message.
Yes
121
Flow temperature for (HC1) not reached.
Yes
122
Flow temperature for (HC2) not reached.
Yes
127
Anti-legionella temperature not reached.
Yes
369
External fault (safety component).
No
370
Outside unit connection error.
(In the start phase, see the para. "Start-up”).
See below and
page 58
&
59
No
Hydraulic unit
: Flashing of the diode visible on the interface card.
Diodes display
Error contents
LED 2 (green)
LED 1 (red)
1 Flash
1 Flash
Communication error between Hydraulic unit and Outdoor unit.
4 Flashes
1 Flash
Heat pump capacity signal error (Open or short).
4 Flashes
2 Flashes
Hydraulic unit heat-exchange thermistor Error.
6 Flashes
3 Flashes
Inverter error.
6 Flashes
4 Flashes
Active filter error.
7 Flashes
1 Flash
Discharge thermistor error.
7 Flashes
2 Flashes
Compressor thermistor error.
7 Flashes
3 Flashes
Heat-exchange thermistor (outlet / intermediate) error.
7 Flashes
4 Flashes
Outdoor thermistor error.
7 Flashes
7 Flashes
Heat sink thermistor error (inverter / P.F.C.).
7 Flashes
8 Flashes
Expansion valve thermistor error.
8 Flashes
4 Flashes
Current sensor error.
8 Flashes
6 Flashes
Pressure sensor error / Pressure switch error.
9 Flashes
4 Flashes
Current trip.
9 Flashes
5 Flashes
Detection of compressor position error / Compressor start up error.
9 Flashes
7 Flashes
Outdoor unit fan motor error.
10 Flashes
1 Flashes
Discharge temperature protection.
10 Flashes
3 Flashes
Compressor temperature protection.
10 Flashes
5 Flashes
Low pressure abnormal.
Continuous flashing (1 sec On / 1 sec Off)
Pump down operation.
Continuous lighting
Off
Defrosting.
Installation and operating manual "1572 - EN"
Heat pump air/water split 2 services alféa excellia duo
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