Boiler Not Firing Up in Barnet - Common Causes and What Landlords and Tenants Should Know

Published October 2026 | Boiler Repair

Landlord Obligations Under Current Regulations

In England and Wales, the law is clear: landlords are responsible for keeping the heating and hot water system in working order. This obligation sits under the Landlord and Tenant Act 1985, which requires landlords to maintain the structure and installations of a rented property - including the boiler, pipes, and heating controls.

The Homes (Fitness for Human Habitation) Act 2018 added further weight to this. A rental property without working heating can be deemed unfit for human habitation. In Greater London, where rental housing standards are under closer scrutiny than in many other parts of the country, tenants have a well-established route to hold landlords to account. That route runs through the courts, and tenants do not need a solicitor to use it.

As a landlord in Barnet, you are legally required to:

1. Ensure the boiler and heating system are in proper working order at the start of every tenancy
2. Respond promptly to repair requests - in practice, within 24 hours for a complete loss of heating or hot water
3. Arrange all gas work through a Gas Safe registered engineer. This is a legal requirement under the Gas Safety (Installation and Use) Regulations 1998 - not a best practice, a legal duty
4. Provide tenants with a copy of the current Gas Safety Certificate within 28 days of it being issued, and before a new tenancy begins
5. Have the boiler serviced at least once a year

In terms of costs, diagnosing and repairing a boiler ignition fault in the Greater London area typically runs between 80 and 250 pounds, depending on the fault and the engineer's call-out rate. If parts are needed - an igniter electrode, a gas valve, or a PCB - add another 50 to 200 pounds on top. A full boiler replacement in a Barnet rental property commonly costs between 1,500 and 3,000 pounds installed, depending on the model and flue configuration.

These costs sit with the landlord. Not the tenant.

What Tenants Are Expected to Handle

Not every boiler problem is the landlord's responsibility. Tenants are expected to carry out basic checks before reporting a fault, and some of the most common causes of a boiler not firing up are things a tenant can resolve in a few minutes without calling anyone.

Run through these checks before you pick up the phone:

1. Thermostat settings - Is the thermostat set above the current room temperature? If it is a wireless thermostat, check the batteries. A flat battery is one of the most frequently overlooked reasons a boiler appears completely dead.
2. Timer and programmer - Check the timer schedule. After a power cut, many programmers reset to a factory default time, which means the boiler may simply not be scheduled to come on when you expect it to.
3. Boiler pressure - Most modern combi boilers need a pressure of between 1 and 1.5 bar to operate. If the gauge drops below 1 bar, the boiler will typically lock out and refuse to fire. You can usually repressurise it yourself using the filling loop - there is often a guide on the boiler door or in the manual. Low pressure is one of the most commonly reported triggers for a boiler failing to fire up.
4. Frozen condensate pipe - In cold weather, the plastic condensate pipe that runs outside can freeze solid. Pour warm water, not boiling, over the external section to thaw it, then press the reset button on the boiler.
5. Gas supply - Try another gas appliance, such as the hob. If that is not working either, the issue is with your gas supply rather than the boiler. Contact your gas supplier directly.
6. Reset button - If the boiler is showing a fault code and has gone into lockout, pressing the reset button once may clear it. Try it once. If it locks straight out again, stop pressing and contact your landlord - repeated lockouts point to an underlying fault that needs a qualified engineer.

If you have worked through all of the above and the boiler is still not firing up, the fault is most likely mechanical or gas-related. That is when it becomes the landlord's problem to sort.

Grey Areas - Where Disputes Happen

The landlord-tenant split on boiler repairs sounds clean on paper. In reality, there are situations where both sides end up arguing about who is liable, and those arguments can go on far longer than they should.

Misuse and accidental damage - If a tenant has interfered with the boiler in a way that caused the fault - removing covers, tampering with internal components, or causing physical damage - the landlord may have grounds to charge for the repair. These cases are difficult to prove without a written engineer's assessment, so both sides should document everything.

Delayed reporting - If a tenant was aware of a developing fault but did not report it for several weeks, and that delay allowed a minor problem to escalate, a landlord might argue the tenant contributed to the damage. This is why reporting faults promptly and in writing matters from day one.

User error versus mechanical failure - A boiler not firing up because the igniter has failed is a mechanical fault. A boiler not firing up because the thermostat is set to 12 degrees in a room that is already 14 degrees is user error. Our engineers see both regularly. Sometimes what a tenant reports as a breakdown is a settings issue; sometimes what a landlord dismisses turns out to be a genuine fault. The Voltrade GoFIX diagnostic tool can help identify which category a problem falls into before anyone picks up the phone, which saves time and helps avoid disputes before they start.

Condensate pipe freezing - Some landlords argue that thawing a frozen condensate pipe is basic tenant maintenance, particularly when the pipe is accessible and the fix takes five minutes with warm water. Some tenants take the view that preventing it from freezing in the first place is the landlord's job. Check what your tenancy agreement says - this one genuinely varies between agreements.

How to Report This Issue (Tenant Perspective)

Reporting a heating fault properly from the outset protects you if the landlord is slow to act or later disputes the timeline. Do not rely on phone calls alone - always follow up in writing.

1. Run the basic checks first - Work through the checklist in the section above. If the boiler starts working, there is nothing to report.
2. Contact your landlord or letting agent in writing - Send a text or email. State that the boiler is not firing up, give the date, and confirm what you have already checked. Keep a copy of everything.
3. Be clear about urgency - If you have no heating and no hot water at all, say so explicitly. This is classified as an emergency repair in most tenancy agreements, and landlords are expected to respond within 24 hours.
4. Follow up if there is no response - If you have not heard back within 24 hours on an emergency repair, send a follow-up message and note the date and time.
5. Escalate through the correct channels - If your landlord in Barnet is not responding or is refusing to act, contact Barnet Council's environmental health team. They have the authority to inspect the property and issue enforcement notices requiring landlords to carry out essential repairs.
6. Do not withhold rent - Withholding rent without following the correct legal process puts you in breach of your tenancy agreement and substantially weakens your legal position.

Getting It Fixed Quickly in Barnet Rental Properties

Speed is everything when a boiler stops working in autumn or winter. In Barnet, as across Greater London, a complete loss of heating qualifies as an urgent repair - and both landlords and tenants should treat it as one.

The most common causes of a boiler not firing up include ignition electrode failure, a faulty gas valve, loss of system pressure, PCB faults, or a blocked condensate trap. Getting to the root cause quickly is what separates a same-day repair from a week of chasing and guessing.

When our engineers attend a call-out, they typically work through the following in order:

1. Check the boiler pressure and repressurise if needed
2. Read and interpret any fault codes on the display panel
3. Inspect the ignition electrode and leads for wear or damage
4. Check gas pressure at the meter and at the boiler inlet
5. Inspect the condensate trap and pipe for blockages or ice
6. Test the PCB for visible faults or component failure
7. Check gas valve operation

Rental properties in Barnet commonly have boilers from Worcester Bosch, Vaillant, Ideal, and Baxi. Each manufacturer uses its own fault code system, and knowing what a code means without having to look it up is often the difference between a one-hour repair and a missed opportunity to order the right part on the first visit.

If the boiler is more than 12 to 15 years old, a landlord may face a choice between a repair running several hundred pounds and a full replacement. Replacement often makes better financial sense at that age, particularly given tightening efficiency expectations for rental properties. A Gas Safe registered engineer can give you an honest steer on which option is more cost-effective for the specific boiler and installation.

Remember: all gas work must be carried out by a Gas Safe registered engineer. It is a legal requirement. Always ask to see the engineer's Gas Safe ID card and check it is current before any work begins.

Documentation You Should Keep

Good records protect both sides. If a dispute reaches the point of a complaint to Barnet Council, a tribunal, or a court, the side with clear and organised documentation is almost always in the stronger position.

Landlords should keep:

• Annual Gas Safety Certificates - you are legally required to hold these and provide copies to tenants
• Boiler service records showing the date and the engineer's Gas Safe registration number
• All repair invoices and written engineer reports
• Written records of maintenance requests from tenants and how each was handled
• Photographic evidence of the boiler's condition at the start and end of each tenancy

Tenants should keep:

• Written records of all fault reports, including the date and method of communication (text, email, letter)
• Copies of any replies from the landlord or letting agent
• Photographs or video of any fault codes displayed on the boiler at the time
• Records of any alternative heating costs incurred if the landlord failed to act promptly
• Notes of any verbal conversations, including the date, time, and what was said on both sides

Keeping these records takes very little effort, but it can matter enormously if things deteriorate. A landlord who can show annual Gas Safety Certificates, regular servicing, and written responses to repair requests is in a very different position to one who has nothing on file.

Landlord and Tenant Questions

Who is responsible for fixing a boiler that will not fire up in a rental property?

The landlord is responsible in almost all cases. Under the Landlord and Tenant Act 1985, landlords must maintain the heating and hot water installation in working order throughout the tenancy. The exception is where a fault has been directly caused by the tenant's misuse of the boiler. Even then, the landlord would typically need a written engineer's report to support any claim for repair costs against the tenant.

How quickly does a landlord have to fix a broken boiler in Barnet?

For a complete loss of heating or hot water, landlords are generally expected to respond within 24 hours and arrange a repair as soon as possible - this is treated as an emergency repair, particularly between October and April. If your landlord has not responded within 24 to 48 hours, follow up in writing and keep a record of that too. If they still fail to act, Barnet Council's environmental health team has the powers to intervene and require the repair to be carried out.

Can a tenant safely deal with a boiler that is not firing up?

Tenants can safely carry out basic checks - repressurising the boiler, adjusting the thermostat, pressing reset once after a lockout, or thawing a frozen condensate pipe with warm water. What tenants must not do is attempt any gas work. Any work involving the gas supply, internal components, or the gas valve must be done by a Gas Safe registered engineer. Attempting gas work without registration is illegal and carries serious safety risks for everyone in the property.

What is a boiler lockout and is it the landlord's responsibility to fix it?

A boiler lockout is a safety shutdown that occurs when the boiler detects a fault - common triggers include low pressure, ignition failure, overheating, and a blocked condensate pipe. If pressing the reset button once clears the lockout and the boiler runs normally afterwards, it may have been a minor or temporary issue. If the lockout returns, there is an underlying fault that needs a Gas Safe registered engineer, and arranging that repair is the landlord's responsibility.

What can a tenant do if their landlord refuses to repair the boiler?

Start by making sure all communications are in writing if they are not already. If the landlord continues to refuse, you can report the fault to Barnet Council's environmental health department, who can inspect the property and issue an improvement notice requiring the work to be done. You may also be able to apply to the First-tier Tribunal (Property Chamber) for an order compelling the landlord to act. Document every step of this process in writing, including dates and the landlord's responses.