9 Troubleshooting
9.1
Messages (bxx or Exx-type codes)
9.1.1
type error codes
In the event of a disruption, the control panel displays a message and a
corresponding code.
1. Make a note of the code displayed.
The code is important for the correct and rapid diagnosis of the
type of malfunction and for any technical assistance that may be
needed.
2. Disconnect then reconnect the mains power cable. The appliance
will only resume operation when the malfunction has been resolved.
3. If the code is displayed again, resolve the problem by following the
instructions in the table below.
If the causes of the problem are still present after several attempts
at automatic start-up, the appliance goes into "Lockdown" mode
(also called "Malfunction").
For more information, see
Messages (-type codes)), page 58
List of
type codes
Tab.15
Code
Description
Checking / solution
Parameters error on the PCU PCB.
Reset the parameters.
See
Restoring factory settings section
Pressure switch alarm.
Note
Domestic hot water production is en
sured by the back-up, if the back-up is
authorised.
Check the compressor power supply.
Check the pressure switch connection.
Maximum domestic hot water temperature excee
ded when domestic hot water production is not
guaranteed (by either the compressor or the back-
up).
Check the top domestic hot water sensor con
nection.
Check that the back-up is not permanently actu
ated.
The room temperature is above 35 °C. The com
pressor is outside of its operating range.
Note
Domestic hot water production is en
sured by the back-up, if the back-up is
authorised
Modify the following parameters in line with the
recommendations in the manual.
The compressor will ensure production of do
mestic hot water once the room temperature is
below 35 °C.
The room temperature is less than - 5 °C
Note
Domestic hot water production is en
sured by the back-up, if the back-up is
authorised
Modify the following parameters in line with the
recommendations in the manual.
The compressor will ensure production of do
mestic hot water once the room temperature ex
ceeds -5 °C.
9 Troubleshooting
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