Turning Off The Boiler; Gas Conversion; Prolonged Shutdown. Frost Protection; Troubleshooting - Baxi Nuvola 3 Comfort Operating And Installation Instructions

System filling tap
Figure 3
To switch off the boiler, disconnect the electric power supply. With the gas boiler in "OFF" mode (section 3.2), the electric circuits remain
powered and the anti-freeze function is enabled (section 8).
The boilers can operate both on natural gas and LPG.
All gas conversions must be made by an authorised Service Engineer.

8. PROLONGED SHUTDOWN. FROST PROTECTION

Do not drain the whole system as filling up with water again causes unnecessary and harmful scale to build up inside the boiler and the
heating elements. If the boiler is not used during winter and is therefore exposed to the danger of frost, add some specific anti-freeze to
the water in the system (e.g.: propylene glycol coupled with corrosion and scale inhibitors). The electronic boiler management system
includes a "frost protection" function for the heating system which, when delivery temperature falls below 5°C, operates the burner until
a delivery temperature of 30°C is reached.
The frost protection function is enabled if:
* the boiler is electrically powered;
* the gas tap is open;
* the system is at the correct pressure;
* the boiler is not blocked.
The climate controller sends two types of signals: FAULT and BLOCK.
FAULT
In the presence of a fault the display shows the symbols
message.
The fault is identified with an error code followed by a letter and cannot be reset by the user.
Call the authorised Service Centre.
INSTRUCTIONS FOR USERS
Boiler drain tap

6. TURNING OFF THE BOILER

7. GAS CONVERSION

9. TROUBLESHOOTING

and the flashing <ERROR>
System drain tap
12
C607215 - GB