Why is my boiler on but there is no hot water?

This is a classic symptom. If the boiler's display is on and it seems to be running, the issue often points to a part that controls the hot water flow, like a faulty diverter valve (on a combi), a broken thermostat, or an airlock in the hot water pipes.

My heating works but my hot water doesn’t. Why?

On a combi boiler, this nearly always points to the diverter valve. The valve is failing to switch from directing hot water to your radiators to directing it to your taps. Your boiler is successfully heating the water, but it’s not sending it to the right place.

Can I just keep resetting my boiler?

You can try resetting it once, as per the manufacturer's instructions. However, if the fault returns, do not keep resetting it. The lockout is happening for a reason — a persistent fault that needs to be diagnosed. Repeatedly resetting can sometimes cause more damage.

Is having no hot water legally considered an emergency in a rented flat?

Yes. Under the Landlord and Tenant Act 1985, landlords must ensure tenants have access to hot water and heating. A complete loss of hot water is classified as an urgent repair, and landlords are expected to act swiftly, usually within 24 hours.

Who pays for the repair in my rented flat?

The landlord is almost always responsible for paying for boiler and heating repairs, as it falls under their legal obligations. The only exception is if the damage was caused directly by you, the tenant, through misuse or negligence.

Should I call a plumber or a Gas Safe engineer?

For any issue with a gas boiler itself, you must use a Gas Safe registered engineer. For related electrical faults (like a dead thermostat or a tripped fuse), you might need a certified electrician. For leaks in the pipes leading to or from the boiler, a plumber can help. FixHive has all three, so you don’t have to worry about calling the wrong trade.

No Hot Water in Flat? Boiler Help in South West London

Name: FixHive London Ltd
Address: London, GB
Telephone: 07777 344070
Price range: ££
Rating: 4.9

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