Medium
A24 on Euroterm E27 Plus

Your boiler has detected that you have had to top up the water pressure four times within a single day, which indicates a significant leak somewhere in your heating system.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed

Book a service

This fault should be looked at by a Gas Safe engineer within the next week or two. It may get worse if left.

What the manual says

Manufacturer manual

4 filling operations in 24 hours

Community-sourced, unverified
We could not tie this code to a specific manual. Treat it as indicative only.
Plain-English guidance below. Severity, DIY steps, costs and parts are our interpretation to help you act, not text from the manual.

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

Find a Gas Safe engineer
Search the official register →
Boiler cover options

Avoid the next call-out bill

A cover plan would handle faults like A24: no call-out fees, no surprise bills.

Approved partner
Domestic Appliance Guard
Unlimited call-outs, 24/7 helpline, no price-hike promise
Get a quote →

Affiliate links. We may earn a commission at no extra cost to you.

Related fault codes

A02View →A23View →

All 38 fault codes on the E27 Plus

Seeing a different code? Every code this model can display, in one place.

A01A02A03A04A05A06A09A16A21A23A41A42A44A61A62A63A64A65F04F05F07F10F11F12F13F14F15F20F34F35F37F39F42F43F47F52F66

Related guides you might find useful

Boiler keeps losing pressure

Six most common causes of dropping pressure.

Read →

Low pressure — repressurise guide

Step-by-step using the filling loop.

Read →

Is boiler cover worth it?

Break-even maths on monthly cover.

Read →