What should I do if my Baxi COMBI 428 shows a communication error between the gas valve and PCB?
If your Baxi Boiler displays a communication error between the gas valve and PCB, it could be due to a fault in the air/gas unit, in this case, replace the air gas unit. Alternatively, there might be a loose connection to the gas valve, so check the gas valve connection from the PCB.
What should I do if the CH Flow temperature is increasing too fast in my Baxi COMBI 428 Boiler?
If the CH Flow temperature is increasing too fast in your Baxi Boiler, it could 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 and check the cleanliness of the heat exchanger.
How to resolve a Baxi COMBI 428's incorrect fan speed?
If your Baxi Boiler's fan speed is incorrect, it could be due to an external draught over the boiler, so check for adequate draw on the chimney connection. It may also be caused by a defective gas/air unit, so check the gas/air unit and replace it if necessary.
What causes 5 x flame loss in 24 hours with burner on in Baxi COMBI 428?
If your Baxi Boiler experiences 5 flame losses in 24 hours while the burner is on, possible causes include: * No ionization current: Purge the gas supply to remove air. * Sensor fault: Check that the gas valve is fully opened, check the supply pressure, check the operation and setting of the gas valve unit, check that the air inlet and flue gas discharge flues are not blocked and check that there is no recirculation of flue gases.
What causes no flame during operation in a Baxi COMBI 428?
If there is no flame during operation in your Baxi Boiler, it could be due to several reasons: * No ionization current: Purge the gas supply to remove air. * Sensor fault: Check the gas valve is fully opened, check the supply pressure, check the operation and setting of the gas valve unit, check the air inlet and flue gas discharge flues are not blocked, check that there is no recirculation of flue gases.
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.
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.
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.
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 |
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