Troubleshooting Service Faults - Baxi DUO-TECMAX+ Instruction Manual For Users And Fitters

If appears on the display the fault must be RESET by the user.
Description of fault
09
Gas valve connection error
10
External probe sensor faulty
12
13
15
Gas valve control error
18
19
20
28
NTC fumes sensor faulty
40 NTC return sensor faulty
50
53
Fumes outlet obstructed
55
Electronic board not calibrated
83...87
92
Fumes fault during calibration (probable fumes recirculation)
109
Air in boiler circuit (temporary fault)
Safety thermostat tripped due to overtemperature (pump
110
probably blocked or air in heating circuit).
117
Pressure in hydraulic circuit too high (> 2.7 bar)
118
No circulation safety trip.
125
(control performed via a temperature sensor)
128
129
130
Fumes NTC tripped due to overtemperature
7651561.02 (1-03/16)
and a number (fault code). For a complete list of faults, see the
for 2 seconds. If faults are displayed frequently, call the Authorised Service Centre.
electronic board.
Check the sensor (*).
See the actions indicated in E12
electronic board. If necessary, replace the electronic board.
Check the sensor (**).
Check the fumes NTC probe (***).
See the actions indicated in E20
See the actions indicated in E20
Check that the drainage pipe is free from obstructions.
seconds.
Activate the automatic calibration function described in the
spare parts instructions sheet.
board or RF link.
Check for any recirculation of fumes.
Activate the automatic calibration function described in
the paragraph YEARLY MAINTENANCE – REPLACING
COMPONENTS.
Check that the limit thermostat is undamaged and replace it if
necessary
Check that the pressure in the system is correct
See the FILLING THE SYSTEM section.
the FILLING THE SYSTEM section).
See the actions indicated in E109
and correctly positioned (see the ANNUAL SERVICING -
POSITIONING THE ELECTRODES section).
See the actions indicated in E92
and correctly positioned (see the ANNUAL SERVICING -
POSITIONING THE ELECTRODES section).
Check for any recirculation of fumes.
Check the fumes NTC probe (***).
38