Heating problems
Hot water is unstable: causes and what to do
When hot water swings between hot and lukewarm, the usual causes are the flow sensor, a scaled heat exchanger or cylinder control. Diagnostics and cleaning fix it.
Answer in 1 working day
How to recognise it
What you see – and what it usually means
Temperature jumps at the tapflow sensor or heat exchanger
Hot water runs out quicklycylinder size or control
Water takes long to warm upscaled heat exchanger – cleaning
Likely causes and the right service
You can safely check
- Check the pressure gauge (usually 1–2 bar for a cold system – see the manual).
- Check that radiator thermostatic heads and manifold valves are open.
- Note the error code and photograph the rating plate.
We do not give repair instructions: gas, electrical and pressurised systems are serviced by qualified specialists.
Smell gas? Do not switch anything electrical, close the gas valve if safe, open windows, leave and call 112.
Fault reporting
Report it in a minute – follow the status online
Choose the system and symptoms, add the error code and a photo. You get a number, a status page and a direct line to the technician. No heating in winter or a leak gets top priority.
- 1System
- 2Symptoms and code
- 3Photo
- 4Contact
3D
See where the problem sits
The 3D house shows the heat source, pump group, manifolds and radiators with water flows – it is easier to understand what the technician will check.
Diagnostics3D · System flushingHeating system with flows
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