Fix a doorbell
Save £40–80 today
30 mins · Beginner · Saves £40–80 vs an electrician
Last updated: March 2025
Before you start
Most doorbell faults are simple: dead batteries, a corroded button, or a loose wire. Check in that order — you will fix it in 10 minutes 70% of the time.
This guide covers standard battery-powered and low-voltage wired doorbells. If your doorbell is hardwired to the mains (no battery, no transformer visible), stop and call an electrician.
Tools needed
- ✓Cross-head screwdriver — to remove the button from the wall
- ✓Flat-head screwdriver — to open terminal connections
- !Replacement batteries — buy: buy: £3–5 — check the chime unit inside; most use AA or a 9V block
- !Replacement button — buy: buy: £5–10 if the button is faulty
Replace the batteries first
Open the chime unit inside your home (the box that makes the sound). Replace all batteries with fresh ones and test. This solves most doorbell faults.
Where beginners go wrong
Not checking batteries first — it is the cause in the majority of cases and takes 30 seconds.
Assuming the wiring is the problem without testing the button directly first.
Buying a wired replacement button without checking the wire length and connection type.
Stop and call a electrician if...
The doorbell is hardwired to the mains — no batteries or transformer visible
There is a burning smell or scorch marks near the chime unit
It is a smart video doorbell with complex wiring you are not familiar with
Cost breakdown
What you just learned
You can now diagnose a doorbell fault systematically — batteries, button, then wiring. This logical approach to fault-finding applies to any low-voltage electrical system.
✅ Completed by 2,143 people
⚠️ Watch out if you rent
A broken doorbell is the landlord's responsibility to repair. Report it in writing. Battery replacement is reasonable tenant maintenance; anything beyond that should be the landlord's cost.