10 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 LED on the interface cards.
10.1 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
Outdoor unit connection error.
(In the start phase, see the para. "Start-up”).
See below. No
441 2
e
zone sensor not congured (if 2nd circuits kit)
BX31; Set the parameter
5700 to 2, 4 or 6
No
" Ensure that the general electrical power supply has been cut off before starting any repair work.
" When the HP is not under tension, protection frost-free is not assured.
Installation and operation manual "1734 - EN"
Heat pump air/water split 1 service alféa extensa +
- 74 -
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