Combi boiler producing no hot water
Check the steps below first — if you\'re not confident, get it fixed safely today.
Find a Gas Safe engineer near you →⚠️ If you smell gas, leave the property and call 0800 111 999.
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Most likely cause & what to check
Check the boiler pressure gauge on the front of the boiler — it should read between 1 and 1.5 bar. If it's below 1, the boiler won't heat your water. Use the filling loop underneath to top it up, then press the reset button.
Check your programmer or thermostat hasn't accidentally been set to heating-only. Make sure hot water is switched on.
Look at the boiler display for any fault codes — take a photo and use our Boiler Fault Code tool to find out what it means.
If those checks don't fix it, call a Gas Safe engineer. Tell them: "My combi boiler isn't producing hot water — heating may still be working. I've checked the pressure and programmer."
🛠 Tools & materials you may need
Find a Gas Safe registered engineer near you and get it fixed properly.
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