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 61 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 lter 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 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 ashing (1 sec On / 1 sec Off) Pump down operation.
Continuous lighting Off Defrosting.
Installation and operating manual "1578 - EN"
Heat Pump alféa extensa duo +
- 60 -
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