How much does it cost to fix Baxi error code E100?

Typical repair cost for the Baxi E100 fault is £0-120 including labour.

E100 Low

Baxi E100 Fault Code

Q: What does the Baxi E100 fault code mean?

Your boiler's internal computer has lost track of the time or date, which can prevent your heating schedules from working correctly.

The Baxi E100 fault code means: your boiler's internal computer has lost track of the time or date, which can prevent your heating schedules from working correctly.. It appears on 26 Baxi models in our database.

Technical description: Internal clock time error on printed circuit board (PCB)

What causes the Baxi E100 fault?

This fault occurs when the boiler's internal computer has lost its programmed date and time settings, often following a power cut or if the boiler has been switched off at the mains for a long period. In some cases, it can also suggest that the internal battery or memory chip on the printed circuit board is starting to fail and can no longer store information.

Typical repair cost £0-120 (including labour)

DIY fix possible

Locate the control panel on the front of the boilerEnter the settings menu to find the 'Time and Date' optionsUpdate the clock to the current time and save the settings

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Baxi models that show the E100 fault code

Click a model for the full fault code list and model-specific repair notes.

Source

Baxi E100 fault code information on this page is sourced and cross-checked against the official Baxi service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026