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Brian HarrisSep 23, 2025
How to fix internal board error on Baxi DUO-TEC MAX+ Boiler?
- RRoberto HobbsSep 23, 2025
If your Baxi Boiler has an internal board error, replace the electronic board.
How to fix internal board error on Baxi DUO-TEC MAX+ Boiler?
If your Baxi Boiler has an internal board error, replace the electronic board.
What to do if pressure is too low in Baxi DUO-TEC MAX+?
If the pressure in the hydraulic circuit of your Baxi Boiler is too low, and the pressure in the CH circuit is less than 0.5 bar, perform filling. Also, check that the hydraulic pressure switch works correctly.
How to fix no flame on Baxi Boiler?
If your Baxi Boiler is not igniting ('no flame' error), check that the flame sensing electrode is in good condition and correctly positioned. Also, check the wire is uninterrupted and makes good contact with the flame sensing electrode and the ignition switch.
Why is flame lost at ignition in Baxi Boiler?
If you're experiencing a loss of flame at ignition with your Baxi Boiler, check that the flame sensing electrode is in good condition and correctly positioned. Also, check the wire is uninterrupted and makes good contact with the flame sensing electrode and the ignition switch. Check for any recirculation of fumes.
What to do if the safety thermostat tripped due to overtemperature in Baxi DUO-TEC MAX+ Boiler?
If the safety thermostat in your Baxi Boiler trips due to overtemperature, which might be caused by a blocked pump or air in the heating circuit, you should check the pump operation by unscrewing the front cap and releasing the pump impeller with a screwdriver. Also, check the pump power input wiring. Inspect the limit thermostat for damage and replace it if necessary, and verify the continuity of the limit thermostat wiring.
How to troubleshoot NTC flow sensor faulty on Baxi Boiler?
If the NTC flow sensor is faulty on your Baxi Boiler, check the sensor, the continuity of the probe wiring, and make sure the wiring has not shorted.
How to fix parasite flame (internal error) in Baxi DUO-TEC MAX+ Boiler?
If your Baxi Boiler displays 'Parasite flame (internal error)', check correct operation of the gas valve.
How to troubleshoot external probe sensor faulty on Baxi Boiler?
To address a faulty external probe sensor on your Baxi Boiler, check the sensor.
What to do if Baxi DUO-TEC MAX+ Boiler shows incorrect power supply frequency?
If your Baxi Boiler displays 'Incorrect power supply frequency', check whether the incorrect electric power supply frequency is due to causes outside the boiler; if so, contact the power supply company.
How to troubleshoot gas valve connection error on Baxi DUO-TEC MAX+?
If your Baxi Boiler displays a gas valve connection error, check the connections between the gas valve and the electronic board.
Provides critical safety instructions regarding gas, fumes, and flammable materials.
Offers advice on optimizing boiler performance and reducing energy consumption through temperature settings.
Explains how to set the desired flow temperatures for central heating (CH) and domestic hot water (DHW).
Describes the different operating modes available for the boiler, such as DHW only or heating only.
Lists the items included in the boiler's packaging.
Provides technical drawings and specifications for boiler dimensions and connection points.
Details the installation of concentric flue ducts, including length limitations and bending rules.
Describes the installation of separate flue and air ducts using an accessory splitting kit.
Guides on how to connect a room thermostat to the boiler's terminal block.
Introduces optional accessories that can be connected, such as external sensors and zone systems.
Provides a detailed procedure for the first-time ignition and gas recognition process of the boiler.
Describes the function used to remove air from the heating circuit after installation or maintenance.
Explains how to activate the chimney sweep function for maximum heating power adjustment.
Details how to perform combustion tests and check CO₂ levels for optimal boiler operation.
Explains the pre-heat function that improves hot water comfort by providing instant hot water.
Outlines the process for converting the boiler from natural gas to LPG and vice-versa by an authorized service.
Details how to adjust the maximum heating power using parameter P13 to match system requirements.
Focuses on the hydraulic unit, including water treatment advice and filter cleaning.
Provides specific instructions and diagrams for correctly positioning the ignition and flame sensing electrodes.
Lists components that require performing the automatic calibration procedure after replacement.
General| Type | Combi |
|---|---|
| Mounting | Wall-mounted |
| ErP Heating | A |
| ErP Water | A |
| NOx Class | 5 |
| Output Range | 24kW |
| Weight | 36.5 kg |
| Fuel Type | Natural Gas |
| Hot Water Flow Rate | 16.4 l/min |
