Symptom guide

No hot water? Start with the visible symptoms

A direct diagnostic route for homes with no hot water, with clear safety boundaries. We cover England, Scotland and Wales; Northern Ireland is not covered.

Call for boiler help

Answer first

What you need to know

Loss of hot water can be caused by controls, pressure, ignition or component faults. Start with visible checks only; never remove the boiler casing.

Safety verdict

Start with visible, external checks only. If you are uncertain, arrange a qualified engineer rather than guessing.

Safe checks before you call

Check whether heating still works and note the difference.
Check the display for a code and whether the boiler is powered.
If the boiler is displaying a gas-related or combustion fault, arrange engineer help rather than resetting repeatedly.

What an engineer checks

Diagnosis is more than the visible symptom.

Check controls, pressure, ignition and hot-water demand safely.

Test relevant components where appropriate.

Record the diagnosed cause and repair outcome.