Baxi DUO-TEC COMPACT, Instruction Manual For Users And Fitters

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7710400 (01-06/18) 6
USER Section
(en)
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 and a number (fault code). For a
complete 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 for 2 seconds. If faults are displayed frequently, call the
Authorised Service Centre.
Description of fault Action
10
External probe sensor faulty Call the Authorised Service Centre.
12
Hydraulic differential pressure switch switching failure Call the Authorised Service Centre.
13
Hydraulic differential pressure switch contacts stuck Call the Authorised Service Centre.
15
Gas valve control error Call the Authorised Service Centre.
18
Hydraulic circuit automatic filling in progress Wait for the end of the filling cycle
19
Fault in system filling phase
Press and hold down for at least 2 seconds.
20
NTC flow sensor faulty Call the Authorised Service Centre.
28
NTC fumes sensor faulty Call the Authorised Service Centre.
40
NTC return sensor faulty Call the Authorised Service Centre.
50
NTC domestic hot water sensor faulty Call the Authorised Service Centre.
53
Fumes outlet obstructed
Disconnect the boiler from the mains power supply
for a few seconds.
If the fault persists, call the authorised
technical service centre
55
Electronic board not calibrated Call the Authorised Service Centre.
83…87
Communication problem between boiler board and control
unit. Probable short circuit on wiring.
Call the Authorised Service Centre.
92
Fumes fault during calibration (probable fumes
recirculation)
Call the Authorised Service Centre.
109
Air in boiler circuit
(temporary fault)
Call the Authorised Service Centre.
110
Safety thermostat tripped due to overtemperature (pump
probably blocked or air in heating circuit).
Press and hold down for at least 2 seconds.
117
Pressure in hydraulic circuit too high (> 2,7 bar) Call the Authorised Service Centre.
118
Pressure in hydraulic circuit too low
Check that the pressure in the system is correct; See the
FILLING THE SYSTEM section.
125
No circulation safety trip
(control performed via a temperature sensor)
Press and hold down for at least 2 seconds.
128
No flame
Press and hold down for at least 2 seconds.
129
Loss of flame at ignition Call the Authorised Service Centre.
130
Fumes NTC tripped due to overtemperature
Press and hold down for at least 2 seconds.
133
Ignition failure (5 attempts)
Press and hold down for at least 2 seconds.
134
Gas valve blocked
Press and hold down for at least 2 seconds.
135
Internal board error
Call the Authorised Service Centre.
Gas valve connection error
154
Delivery/return probe control test Call the Authorised Service Centre.