EN - 50
7. FAULTS
7.1 Fault table
See instructions 3989816 List and description of fault codes
7.2 Alarm reset - Acknowledging faults
To manually acknowledge an alarm (type 3 fault), enter the Unit configuration menu
and select Alarm reset.
If the cause of the fault has been eliminated, select and confirm the value YES in the
setting field.
7.3 Alarm memory
The last 10 type 2 and 3 faults that have occurred on the unit are stored in the Alarm
memory sub-menu.
To access it, enter the Unit configuration menu
then select Alarm memory.
The stored faults are listed from the newest to the oldest.
Fault no. 1 is therefore the most recent.
The date, time and name of the fault are stored.
If no faults have appeared while the machine is operating, the message NO ALARM
STORED is displayed on
the screen
To perform more precise fault diagnostics, the values from the machine's sensors and
probes are stored from the moment the fault occurred. To view these values, simply select
the stored fault by pressing the terminal button.
A measurement table then appears containing the values stored at the moment the fault occurred.
In addition to the measured values, the operating mode is stored in the first line of
the measurement table.
Turn the terminal button to scroll through all the stored values.
To exit the Alarm memory sub-menu, simply press the terminal button.
Components
Accelerator pumps
Automatic seizure protection
To prevent the accelerator pumps from seizing when turned
off, the control system runs them for 45 seconds every day,
regardless of the operating mode.
To keep the automatic seizure protection function active,
we strongly advise against powering off your machine. The
machine must be turned off using the On/Off button on the
terminal and not electrically.
Indoor accelerator pump
The accelerator pump operates continuously in most cases.
It is turned off in the following 4 cases:
- The unit is turned off: the home screen display shows UNIT
STOP
- In absence mode when the outdoor temperature is above
10°C
- In heating mode If P120 = YES and the outdoor temperature
is higher than P194 (factory setting 20°C)
- In heating mode with the boiler heating element if the P121
value is changed to NO.
Unit winter protection:
This function helps prevent the exchanger from freezing, and is
valid in any operating mode.
- Accelerator pump operates if outdoor temperature (P250)<
P300 and water supply temperature (P281)< P300*+5K.
- Accelerator pump stops after at least 3 minutes' operation
if
P281>P300*+10K
or if
outdoor temperature > P300*+2K.
*P300: indoor heat exchanger water frost-free limit value
Outdoor accelerator pump and well pump
Turned off:
- In heating mode with boiler heating element if the P121 value
is changed to NO.
- 3 minutes after the compressor is turned off
Unit winter protection:
This function helps prevent the exchanger from freezing, and is
valid in any operating mode.
- Accelerator pump operates if outdoor temperature (P250)<
P302
and
water supply temperature (P283)< P302*+2K.
- Accelerator pump stops after at least 3 minutes' operation
if
P283>P302*+7K
or if
outdoor temperature > P302*+2K.
*P302: indoor heat exchanger water frost-free limit value
The well pump is controlled by the outdoor accelerator pump.
It is cabled to connector J35 terminals 1/2.
Alarm memory
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