Vokera
Chronic Pressure Loss
Water heater pressure gauge drops over time and needs frequent topping up
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
System leak on heating circuit, Faulty expansion vessel, Dripping pressure relief valve, Micro-leaks at radiator valves
How to Fix / Troubleshooting
Safety first: Allow the system to cool before inspecting for leaks to avoid burns.
User checks:
- Visually inspect radiators, valves, and visible pipework for damp patches or staining.
- Check the pressure relief valve discharge pipe outside for signs of dripping.
- Top up pressure only to the recommended level (around 1.0–1.5 bar cold) and monitor how quickly it drops.
Engineer steps:
- Test and recharge or replace the expansion vessel.
- Replace a leaking pressure relief valve.
- Pressure-test the system to locate hidden leaks.
Frequent topping up introduces fresh oxygen and can cause corrosion; have the issue resolved professionally.
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Repair Difficulty
Medium
3/5
Required Part
Expansion Vessel
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