Baxi A.02.48 code: unit-function configuration error

The Baxi A.02.48 code means “Unit function configuration error.” This is the wording in Baxi’s current error-code information. It points to a technical configuration problem within the boiler rather than an ordinary room-thermostat or timer setting.

If A.02.48 appears, record the code exactly and note what the heating and hot water are doing. Do not enter installer menus, change parameters or remove the boiler casing. A persistent message needs a suitably qualified Gas Safe registered engineer.

What does Baxi A.02.48 mean?

Baxi describes A.02.48 as a unit function configuration error. The public fault table does not identify which internal function is affected or name one component that must be replaced. That matters because the code is a starting point for trained checks, not a complete repair instruction.

The code is listed for a model group that includes Baxi 200, 400, 600 and 800 Combi 2 boilers, Baxi Assure 500 Combi 2, Baxi 600 and 800 System 2, and Baxi Assure 500 System 2. Check the full name of your own boiler against its user guide because controls and reset methods are not identical across every range.

What is a unit function configuration error?

Configuration tells the boiler’s controls how the appliance is set up to operate. The phrase “unit function” is technical language; Baxi’s public description does not narrow it to one user-adjustable setting. It should not be confused with choosing a heating temperature, changing a schedule or turning a room thermostat up.

The message can be relevant after installation, commissioning, a control-related repair, a component change or a power interruption, but the display alone cannot confirm the cause. An engineer needs to consider the exact model, the boiler’s history and safe test results.

Is A.02.48 the same as A.02.49?

No. The numbers are close but Baxi lists different meanings. A.02.48 is a unit function configuration error, while A.02.49 is described as failed node initialisation. Record every digit and punctuation mark so the engineer is working from the right code.

Do not use advice written for a different A.02 code. Similar-looking codes may refer to different conditions and different model groups.

What can you safely check?

Homeowner checks should stay outside the sealed appliance:

• Confirm the display shows A.02.48 and photograph it if possible.
• Find the full Baxi model name on accessible paperwork or an external label.
• Note whether heating, hot water or both have stopped.
• Record any other code that appears before or after A.02.48.
• Think back to recent installation, servicing, controls work, component replacement or a power cut.
• Check only the ordinary user controls described in the model’s homeowner guide.

These observations give the engineer useful context without risking damage or changing information they may need to inspect.

Can you reset a Baxi A.02.48 error?

You may use the normal reset control once if the official user guide for your exact model instructs you to do so. Reset designs vary, so do not rely on button sequences for a different Baxi boiler. If the code immediately returns, comes back later or the appliance will not operate normally, arrange a repair.

A factory reset is not the same as the ordinary homeowner reset. Do not select factory, installer or commissioning options, and do not alter configuration values in an attempt to clear the display.

What should you avoid doing?

Do not remove the front casing, disturb wiring or connectors, test voltages, change control-board settings or attempt to configure replacement parts. Do not buy a circuit board or another component simply because a search result associates it with the code. Internal boiler work and decisions about gas-appliance controls require the correct competence and model information.

Repeatedly switching the power off and on can also hide the pattern of the fault without fixing it. Record what happened, then leave the appliance in a safe condition for the engineer.

Is A.02.48 a gas emergency?

Baxi’s published meaning is a configuration error, not a gas-leak warning. However, the normal gas and carbon-monoxide precautions still apply. If you smell gas, suspect carbon monoxide, feel unwell near the boiler or a carbon-monoxide alarm sounds, leave the property and follow the current emergency guidance. Do not use an online fault-code article as a substitute for emergency action.

Who can fix a Baxi A.02.48 fault?

A suitably qualified Gas Safe registered engineer should investigate a persistent A.02.48 code. They can verify the model, examine the boiler’s configuration safely and determine the work needed to restore normal operation. The engineer should base the repair on testing rather than treating the wording as proof of a particular failed part.

Leaving the casing closed and keeping a clear note of the circumstances are the most useful things a homeowner can do before the visit.

Quick answers about Baxi A.02.48

What does A.02.48 mean on a Baxi boiler?

It means “Unit function configuration error,” according to Baxi’s current error-code table.

Is A.02.48 a thermostat setting problem?

Not usually. The published wording concerns technical appliance configuration, which is different from changing the room temperature or heating schedule.

Can I change the configuration myself?

No. Avoid installer menus, parameters and factory settings. Those controls can affect safe operation and should be handled by a suitably qualified engineer.

Should I reset the boiler?

Use the normal reset once only if the official guide for your exact model tells you how. If A.02.48 returns, arrange professional help rather than repeatedly resetting it.

Does the code prove the control board is faulty?

No. The code describes a configuration error but does not identify one failed component. Testing is needed before deciding on a repair.

What should I tell the engineer?

Give them the exact code, complete model name, heating and hot-water status, any accompanying messages and details of recent work or power interruptions.