Prolonged Shutdown. Anti-Freeze Protection; Gas Conversion; Faults - Baxi NUVOLA DUO-TEC GA 16 Instruction Manual For Users And Fitters

2. PROLONGED SHUTDOWN. ANTI-FREEZE PROTECTION

Do not drain the whole system as filling up with water again could cause 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, lights the burner until a delivery temperature of 30°C is reached.
The function is operative if: the boiler is electrically powered, there is gas, system pressure is normal and the boiler is not
blocked.

3. GAS CONVERSION

The boilers can operate both on natural gas (G20) and LPG (G31). All gas conversions must be made by the AUTHORISED
TECHNICAL SERVICE CENTRE.

4. FAULTS

The faults shown on the display are identified with the symbol
plete list of faults, see the following table.
If appears on the display the fault must be RESET by the user.
To RESET the boiler, press and hold down
Authorised Service Centre.
ERROR description
09
Gas valve connection error
10
External probe sensor faulty
15
Gas valve error
20
NTC flow sensor faulty
28
NTC fumes sensor faulty
40
NTC return sensor faulty
NTC domestic hot water sensor faulty
50
(only for heating-only model with storage boiler)
53 *
Fumes outlet obstructed
55
PCB unscheduled
83-84
Communication problem between boiler board and
86-87
control unit. Probable short circuit on wiring.
98
Internal board error
109
Air in boiler circuit (temporary fault)
Safety thermostat tripped due to over
110 temperature.
(pump probably blocked or air in heating circuit)
* Switch off the boiler for a few swconds
In the event of a fault, the display backlighting indicates the error code. 5 reset attempts can be performed after which the
boiler shuts down. Wait 15 minutes before attempting to reset the boiler again.
7105978.01 (1-08/11)
and a number (fault code). For a com-
for 2 seconds. If faults are displayed frequently, call the
117
118
125
128
130
133
134
135
160
317
321
384
385
22
ERROR description
Hydraulic pressure too high
Pressure in hydraulic circuit too low
No circulation safety trip
(control performed via a temperature sensor)
No flame
Fumes NTC tripped due to over temperature
Ignition failure (5 attempts)
Gas valve blocked
Gas supply cuts out
Fan fault
Incorrect power supply frequency
NTC domestic hot water sensor faulty
Parasitic flame (internal error)
Input voltage too low