Boiler Losing Pressure: Who Should You Call in Sussex?

A boiler that loses pressure once is not the same problem as a boiler that repeatedly drops back down after the pressure has been restored. If the gauge keeps falling, the sensible next step is to arrange a professional check rather than repeatedly treating the gauge reading as the whole problem.

For a gas boiler, the person carrying out gas work must be appropriately Gas Safe registered and competent for that type of work. The Health and Safety Executive states that businesses carrying out gas work within the scope of the Gas Safety (Installation and Use) Regulations must be on the Gas Safe Register, and homeowners are encouraged to check the engineer's ID card and competencies.

For Sussex homeowners, landlords and letting agents, the practical question is therefore: do you need a general plumber, a heating engineer or a Gas Safe registered boiler engineer?

Start with a Gas Safe registered engineer for a gas boiler

If the appliance is a gas boiler and the issue may require work on the boiler itself, use a Gas Safe registered engineer who is competent to work on boilers.

You can browse gas engineers on TradeKind and describe the pressure problem when making contact.

Some businesses offer both plumbing and gas/heating work, but the important point is that gas boiler work requires the appropriate Gas Safe registration and competence. Do not assume that every general plumber is qualified to work on the gas appliance itself.

What does “boiler losing pressure” actually mean?

Most sealed heating systems have a pressure reading visible on the boiler or system controls. If that reading repeatedly falls, it suggests the system is not maintaining its expected pressure.

There are several possible reasons, and they are not all visible to the homeowner. Rather than trying to diagnose internal boiler components yourself, record what is happening and give that information to the engineer.

Useful observations include:

• the pressure reading when the system is cold;
• whether the reading changes significantly when the heating is on;
• how long it takes to fall;
• whether the boiler stops operating or shows an error code;
• whether you can see any water around radiators, valves or accessible pipework;
• whether anyone has recently bled a radiator or worked on the heating system;
• whether the pressure has already been topped up and then dropped again.

These details can help the engineer understand the pattern before attending.

Should you keep repressurising the boiler?

If you already know the manufacturer-approved user procedure for your boiler, its manual may explain normal user controls. However, repeatedly restoring the pressure without understanding why it keeps falling can hide the fact that the underlying problem still needs attention.

Do not open the boiler casing or attempt gas work yourself.

If you suspect the appliance is unsafe, the HSE advises turning it off and not using it until it has been checked by a Gas Safe registered engineer.

What if there is a visible water leak?

A visible leak around a radiator, accessible pipe joint or another part of the heating system is useful information to pass on. Depending on exactly where the problem is, it may fall within plumbing or heating work rather than the gas appliance itself.

If you are posting the job, explain both the boiler symptom and the visible leak rather than choosing one and leaving out the other.

For example:

“Gas boiler pressure drops from normal to low within a day. Small amount of water visible near one radiator valve. Looking for someone qualified to diagnose the cause.”

That is much more useful than simply writing “boiler broken”.

Landlords and letting agents: keep gas-safety responsibilities separate from the repair request

If you manage a rented property, a boiler pressure issue may arise between scheduled gas-safety checks. The repair itself should still go to an appropriately Gas Safe registered engineer where gas work is involved.

The HSE states that landlords must use Gas Safe registered engineers for maintenance and safety checks on gas equipment they provide to tenants, and annual gas safety checks remain a separate legal responsibility.

A repair visit does not automatically replace the landlord's wider gas-safety duties, so keep the records and purpose of each visit clear.

What to include when requesting help

Whether the property is in Brighton & Hove, Worthing, Crawley, Horsham, Chichester, Eastbourne or elsewhere in Sussex, include enough detail for the engineer to understand the job before travelling.

Useful information includes:

• property town or area;
• boiler make and model if easily visible;
• whether it is a gas boiler;
• current pressure reading;
• how quickly pressure is dropping;
• any error code shown;
• whether heating and hot water still operate;
• whether there is a visible leak;
• whether the property is owner-occupied or rented;
• access arrangements if you are a landlord or agent.

For properties in Hastings, Lewes, Haywards Heath, Burgess Hill, Bexhill-on-Sea, Shoreham-by-Sea, Lancing, Littlehampton, Bognor Regis, Hailsham, Uckfield, East Grinstead, Seaford or Crowborough, it is also worth checking that the engineer genuinely covers the address before booking.

How to check the engineer

The HSE advises consumers to check that the engineer is on the Gas Safe Register and to look at the ID card. The reverse of the card shows the categories of gas work the engineer is qualified to undertake.

That matters because “Gas Safe registered” is not simply a generic badge for every type of gas work: the engineer should be competent for the specific work required.

When the problem may need more than one trade

If pressure loss has caused water damage elsewhere in the property, the boiler or heating problem should be dealt with first. Any resulting damaged plaster, flooring or decoration can then be assessed separately.

Similarly, if a leak turns out to be on ordinary domestic pipework outside the boiler, the business attending may handle both heating and plumbing work, or a separate plumber may be appropriate.

For a gas boiler, the decision is straightforward

If a gas boiler keeps losing pressure, start with a Gas Safe registered engineer who is qualified for boiler work.

Record the pressure pattern and any visible leaks, do not dismantle the appliance, and describe the symptoms clearly when arranging the visit.

Browse gas engineers in Sussex or post the job on TradeKind.