7.5
Draining the heating system
It may be necessary to drain the central heating system if radiators need
to be replaced, if there is a major water leak or if there is a risk of freezing.
1. Open the valves on all the radiators connected to the system.
2. Shut down the boiler.
3. Wait approximately 10 minutes, until the radiators feel cold.
4. Connect a drain hose to the lowest draining point. Place the end of the
hose in a drain or at a place where drained pipe water will not cause
any damage.
5. Open the central heating system filling/draining valve. Drain the
installation.
Warning
The water may still be hot.
6. Close the drain valve when no more water comes from the draining
point.
8 Troubleshooting
8.1
Resolving operating errors
If the boiler malfunctions, a code is displayed on the main screen of the control panel. This code is important for the correct and
rapid diagnosis of the type of malfunction and for any technical assistance that may be needed.
There are 3 types of error:
Tab.43
Type of code
Code format
Error
Hxx.xx
Fault
Exx.xx
Alarm
Axx.xx
1. Make a note of the code displayed on the screen.
2. Remedy the problem described by the error code or contact the installer.
3. Switch the boiler off and back on to check that the cause of the error has been removed.
4. If the code is displayed again, contact the installer.
8.2
Error codes
An error code is a temporary status resulting from the detection of an anomaly on the boiler.
When one of the codes below is displayed, contact the professional responsible for maintenance of the boiler.
Fig.20
MW-2000561-1
5
3
2
1
2
3
4
1
4
8 Troubleshooting
30
CFU
7740570 - v04 - 03112022
