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Emergency Boiler Repair

Boiler completely stopped, leaking, repeatedly locking out or leaving you without heating or hot water? Let’s Heat provides urgent boiler fault diagnosis and repair with Gas Safe registered engineers. Check appointment availability when booking.

Emergency Boiler Repair & Breakdown Help

Find guidance for urgent boiler breakdowns, leaks, repeated lockouts and loss of heating or hot water, including when to arrange a Gas Safe registered engineer.

URGENT BOILER PROBLEM FINDER

What Has Happened to Your Boiler?

Choose the problem that best matches what is happening. You’ll get a quick answer, safe checks and guidance on when to arrange an emergency boiler repair.

+ Tap a problem to open
01 Why Has My Boiler Completely Stopped Working? The appliance appears dead, locked out or will not start +
QUICK ANSWER

A boiler that has completely stopped may have lost electrical power, entered lockout, lost system pressure or developed a fault that prevents normal operation.

Possible causes

  • Boiler lockout or appliance fault
  • Loss of electrical power
  • Very low system pressure
  • Thermostat or controls problem
  • Internal boiler component fault

Safe checks you can make

  • Check whether the boiler display has power
  • Look for a fault or error code
  • Check the boiler pressure reading
  • Check normal thermostat and timer settings
  • Never remove the boiler casing
WHEN TO GET HELPBoiler still completely off?

If normal user checks do not restore operation, arrange a boiler diagnosis so the underlying fault can be identified.

Report Boiler Breakdown →
02 What Should I Do If My Boiler Is Leaking Heavily? Water is continuing to come from or around the appliance +
QUICK ANSWER

A significant boiler leak needs prompt attention. Water may be coming from the appliance, a valve, nearby pipework or another heating-system connection.

Possible sources

  • Boiler component leak
  • Valve or connection leak
  • Heating-system pipework
  • Pressure-related discharge
  • Nearby plumbing connection

Safe checks you can make

  • Look for the source without removing covers
  • Keep water away from electrical equipment
  • Check whether boiler pressure has changed
  • Check accessible nearby pipework
  • Do not dismantle the appliance
URGENT ATTENTIONLeak continuing or worsening?

Arrange an engineer visit, particularly when the leak is affecting boiler operation or is close to electrical equipment.

Report Boiler Leak →
03 Why Does My Boiler Keep Locking Out? The boiler repeatedly stops and shows a fault or warning +
QUICK ANSWER

Repeated boiler lockouts usually mean the appliance is detecting a condition that prevents safe or normal operation. The exact cause depends on the fault code and boiler model.

The fault may relate to

  • Ignition or flame operation
  • System pressure
  • Heating circulation
  • Sensors or controls
  • Another manufacturer-specific fault

Useful information to record

  • Exact fault code
  • Boiler make and model
  • Current pressure reading
  • When the lockout occurs
  • Whether heating or hot water is affected
WHEN TO GET HELPFault keeps returning after a reset?

Repeated lockouts should be diagnosed rather than continually resetting the boiler without finding the cause.

Book Boiler Diagnosis →
04 What If I Suddenly Have No Heating? The whole property has lost central heating +
QUICK ANSWER

Complete loss of heating can be caused by a boiler breakdown, controls problem, low pressure or another central-heating fault. It may become more urgent during cold weather or where vulnerable occupants are affected.

Possible causes

  • Boiler breakdown or lockout
  • Low boiler pressure
  • Thermostat or programmer issue
  • Heating circulation problem
  • Electrical or controls fault

Safe checks you can make

  • Check whether the boiler has power
  • Check the thermostat is calling for heat
  • Look for an error code
  • Check boiler pressure
  • Note whether hot water is also affected
WHEN TO GET HELPNo heating anywhere?

If the property remains without heating after normal user checks, check repair availability and report the boiler symptoms.

Report No Heating →
05 What If I Have No Heating and No Hot Water? Both boiler functions appear to have stopped +
QUICK ANSWER

Losing both heating and hot water can indicate a boiler lockout, power problem, low pressure or another fault preventing the appliance from operating normally.

Possible causes

  • Complete boiler lockout
  • Electrical supply problem
  • Very low boiler pressure
  • Controls or appliance fault
  • Another system-specific problem

Safe checks you can make

  • Check the boiler display
  • Look for a fault code
  • Check boiler pressure
  • Check normal user controls
  • Do not remove any boiler panels
WHEN TO GET HELPHeating and hot water both lost?

If normal user checks do not restore operation, arrange boiler fault diagnosis.

Report Boiler Failure →
06 What Should I Do If I Smell Gas? A suspected gas leak is not a normal boiler-repair booking +
QUICK ANSWER

If you smell gas or suspect a gas leak, contact the National Gas Emergency Service immediately on 0800 111 999 rather than waiting for a normal boiler-repair appointment.

What to do

  • Call 0800 111 999
  • Follow the emergency safety advice provided
  • Keep away from anything that may create a spark
  • Do not attempt to repair the appliance yourself

Do not

  • Remove the boiler casing
  • Investigate gas components yourself
  • Ignore a suspected gas leak
  • Wait for a routine boiler appointment
GAS EMERGENCYSuspect a gas leak?

Contact the National Gas Emergency Service immediately.

Call 0800 111 999 →
07 Why Has My Boiler Pressure Dropped to Zero? The pressure gauge is extremely low or empty +
QUICK ANSWER

Pressure at or close to zero means the sealed heating system has lost pressure. A leak, boiler-side issue or pressure-control problem may be responsible.

Possible causes

  • Heating-system leak
  • Radiator valve or pipework leak
  • Boiler-side pressure problem
  • Expansion or pressure-control issue

Safe checks you can make

  • Confirm the pressure reading
  • Look for visible water near radiators
  • Check accessible valves and pipework
  • Look underneath the boiler without opening it
  • Note how quickly pressure was lost
WHEN TO GET HELPPressure collapsed or repeatedly falling?

Arrange an inspection to identify why the system is losing pressure.

Diagnose Pressure Loss →
08 Can an Emergency Boiler Repair Still Lead to Replacement? Sometimes repairing the existing boiler may not be the best route +
QUICK ANSWER

Yes. If the boiler has a major fault, repeated breakdowns, limited parts availability or is no longer economical to repair, replacement may be worth comparing with further repair.

Repair may make sense when

  • The fault can be repaired economically
  • The boiler is otherwise in suitable condition
  • Replacement parts remain available
  • The appliance still suits the property

Replacement may be worth comparing when

  • The boiler suffers repeated breakdowns
  • A significant repair is required
  • Parts availability is limited
  • The existing boiler no longer suits the home
COMPARE YOUR OPTIONSRepair or replacement?

If repairing the existing appliance is not the suitable route, compare replacement boiler options.

View New Boiler Options →
REPORT THE BREAKDOWN

Useful details when you book

You do not need to diagnose the fault yourself. A few simple details can give the engineer a useful starting point.

01 Boiler make and model
02 Exact fault code
03 Current pressure
04 What has stopped working
WHAT HAPPENS NEXT

From breakdown to next step

Tell us what has happened and provide the appliance information you have.

1
Report the fault Tell us what has stopped working and include any visible fault code.
2
Engineer assessment The boiler and relevant heating-system components are checked.
3
Understand the next step We explain the fault and the appropriate repair or replacement route.
Gas safety comes first

Never remove a boiler casing or attempt work on gas components yourself. If you smell gas or suspect a gas leak, call the National Gas Emergency Service on 0800 111 999. If there is an immediate threat to life or property, call 999 or 112.

BOILER BROKEN DOWN?

Tell us what has happened

Report the symptoms, fault code, boiler details and what has stopped working. Check current appointment availability when booking.

Report Boiler Breakdown

Annual Boiler Service

Stay on top of annual servicing. Regular servicing can help meet manufacturer servicing requirements and keep your boiler properly maintained.

From £75

Boiler Repair

No heating, no hot water, or a boiler fault code? We’ll diagnose the problem and explain the repair options clearly.

From £120

Loved by homeowners

Don't just take our word for it

Real feedback from customers who have used Let’s Heat for heating and cooling services.

Really straightforward from the first enquiry through to installation. Everything was explained clearly and the work was left tidy.

J

James

Cardiff

Good communication throughout and helpful advice when choosing the replacement boiler. The installation went smoothly.

S

Sarah

Newport

Booked a boiler service and the engineer explained what had been checked and what to keep an eye on. Very helpful.

D

Daniel

Bristol

Quick response when our boiler developed a fault. The problem was explained clearly and we knew what the options were.

E

Emma

Bridgend

The air conditioning installation was neat and the system was explained properly before the engineer left.

M

Michael

Swansea

Friendly, clear and easy to deal with. We were kept updated and knew what was happening at each stage.

S

Sophie

Chepstow

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Boiler support for every stage

Get help with a boiler fault

Arrange professional fault diagnosis when your boiler stops working properly or your heating and hot water are affected.

Gas Safe registered engineers

Boiler installation, servicing and repairs carried out by Gas Safe registered engineers.

Warranty and aftercare

Clear handover, warranty information and support after your new boiler installation.

Flexible boiler finance

Spread the cost of your new boiler with available finance options, subject to status and lender approval.

Rated by our customers

Read verified customer feedback across our independent review platforms.

Is it time to replace your old boiler?

Explore modern boiler options for your home and get straightforward guidance on boiler type, size, controls and installation.

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Areas We Cover

Boiler Repairs Across South Wales & Bristol

Let’s Heat provides boiler repairs and fault diagnosis across Cardiff, Newport, Bristol and surrounding South Wales and South West areas. Check availability for your postcode when booking.

How to Report an Issue

If you have a problem with your boiler, heating, gas or air conditioning, you can report the issue using one of the options below.

Call Us

Speak to our team about the issue and tell us what is happening. We can then advise you on the next step or arrange an appointment where appropriate.

Email Us

Send us details of the issue, including any fault codes or useful information about the appliance or system.

Report an Issue Online

Complete our online form with a few details about the problem, your property and the service you need.