Immersion Heater Not Working - UK Electrical Help

Immersion heaters use electrical elements and controls to heat water and can fail electrically over time.

Common Reasons Immersion Heater Not Working

Electrical components are common failure points.

Failed heating element
Faulty thermostat
Tripped breaker
Wiring faults

Safe Checks You Can Carry Out

You can check controls without opening covers.

Check the breaker
Ensure the timer is set correctly
Avoid removing covers

Recommended Tools

If you’re confident carrying out basic checks, these tools can help identify electrical faults safely:

Socket tester – quickly shows if the socket is wired correctly and safe to use
Multimeter – helps check voltage, continuity, and identify faults
Voltage tester pen – detects live wires instantly without contact
Replacement UK plug – useful if a plug is damaged, loose, or overheating and needs safely replacing
Spare fuse kit – allows you to safely replace blown fuses in plugs when appliances stop working

For a full list of tools you can use, see our guide on best electrical tools for homeowners.

Using these tools can help you identify the problem in minutes and avoid unnecessary call-out costs.

Many homeowners use a simple socket tester first before deciding whether an electrician is needed.

These tools are widely available online and can be useful for basic fault finding in the home.

When to Call an Electrician

Immersion heater faults often require testing.

Hot water does not return
The breaker trips repeatedly
Burning smells appear

Need an Electrician?

If this issue keeps happening or you’re unsure what’s causing it, a qualified electrician can safely diagnose and fix the problem. Electrical faults can worsen over time, so it’s best to get professional advice rather than risk damage or injury.

If you’re unsure who to contact, a local, registered electrician can safely diagnose and resolve this type of fault.

If you’re dealing with recurring faults or safety concerns, it may help to speak with a local electrician who can assess the issue properly.

UK Electrical Safety Advice

Electrical faults can be dangerous. If you are unsure, always seek advice from a qualified electrician. This guidance is for general information only and does not replace a professional inspection.
For general guidance on household electrics, see our electrical advice for UK homes.