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Aaron LeeSep 18, 2025
What does 'Incorrect configuration settings C1/C2' mean on my Baxi Boiler?
- KKyle NguyenSep 19, 2025
If your Baxi Boiler displays 'Incorrect configuration settings C1/C2', it means there is incorrect C1/C2, so reset C1/C2.
What does 'Incorrect configuration settings C1/C2' mean on my Baxi Boiler?
If your Baxi Boiler displays 'Incorrect configuration settings C1/C2', it means there is incorrect C1/C2, so reset C1/C2.
What to do if my Baxi COMBI 428 has low system water pressure?
If your Baxi Boiler shows low system water pressure, it could be due to a water leak. Check the boiler and the entire system for any signs of leakage. You may also need to repressurize the system.
How to fix no domestic hot water in my Baxi COMBI 428 Boiler?
If your Baxi Boiler isn't providing domestic hot water, start by ensuring the boiler is receiving power by checking the fuses and switches. Also, verify that the gas isolation cock is fully open and, if applicable, that your prepayment meter has sufficient credit. It's also possible that the DHW function is switched off, so try activating the DHW mode. Check the water pressure; if it's below 0.5 bar, re-pressurise the system. Finally, make sure the flow is at least 2.5 litres per minute.
Why are my radiators cold with my Baxi COMBI 428 Boiler?
If your radiators are cold when using your Baxi Boiler, first, check the temperature set point for the heating and increase it using the CH temperature knob or your room thermostat. Make sure the heating mode is activated. Ensure that all radiator valves are open. Also, check that the boiler is receiving power by checking the fuses and switches, and verify the gas isolation cock is open. If the water pressure is too low (below 0.5 bar), re-pressurise the system.
What does 'Parameter error' mean on my Baxi COMBI 428 Boiler?
If your Baxi Boiler displays 'Parameter error', it means there are incorrect parameters, so reset C1/C2.
What does communication error with the HMI PCB mean on my Baxi Boiler?
If your Baxi Boiler shows a communication error with the HMI PCB, it means the HMI is not connected, so check wiring.
What causes a Baxi COMBI 428 Boiler to display 'Return temperature sensor short-circuit'?
If your Baxi Boiler displays 'Return temperature sensor short-circuit', it could be due to: * Sensor not or badly connected: Check the wiring. * Bad connection: Check that the sensors are operating correctly. * Sensor fault: Check that the sensor has been correctly fitted and replace the sensor if necessary.
What causes a Baxi COMBI 428 Boiler to display 'Flow temperature sensor open-circuited'?
If your Baxi Boiler displays 'Flow temperature sensor open-circuited', it could be due to: * Sensor not or badly connected: Check the wiring. * Bad connection: Check that the sensors are operating correctly. * Sensor fault: Check that the sensor has been correctly fitted and replace the sensor if necessary.
What to do if my Baxi Boiler has no circulation?
If your Baxi Boiler has no circulation, it could be due to: * No circulation: Vent the air in the heating system. * Sensor not or badly connected: Check the water pressure and check the wiring. * Sensor fault: Check the circulation (direction, pump, valves), check the cleanliness of the heat exchanger, check that the sensors are operating correctly and replace the sensor if necessary.
How to fix no circulation of water in my Baxi COMBI 428 Boiler?
If there is no circulation of water in your Baxi Boiler, it may be due to: * Non-existent or insufficient circulation: Check circulation. * Sensor error: Check water pressure, check sensors are operating correctly, check that the sensor has been correctly fitted, check the cleanliness of the heat exchanger and check pump.
Essential safety guidelines for operating the Baxi Combi boiler, including warnings and precautions.
Advice on system pressure, accessibility, and maintaining labels for optimal boiler performance and safety.
Diagrams and required clearances for installation, including connection points for the Baxi Combi boiler.
Step-by-step guide for initial boiler start-up and operational checks.
Flowchart for diagnosing and resolving basic operational issues during boiler startup.
Instructions for adjusting central heating and domestic hot water temperatures via control knobs.
Steps for checking system pressure, radiators, and valves, and cleaning the boiler exterior.
Procedure for topping up system water pressure using a filling loop, ensuring it's between 1-1.5 bar.
Explanation of temporary and permanent error codes, their meanings, and reset procedures.
Table listing common problems like no hot water or cold radiators with possible causes and solutions.
General| Output Power | 28 kW |
|---|---|
| Fuel Type | Natural Gas |
| Type | Combination Boiler |
| Dimensions (H x W x D) | 700 x 400 x 285 mm |
| Water pressure | 1 bar |
