Biasi Chronic Pressure Loss

Water heater frequently loses pressure and needs 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, Faulty expansion vessel, Dripping pressure relief valve, Air vent leakage

How to Fix / Troubleshooting

Safety: Allow the system to cool before working on pressurised components.

Steps:

  • Inspect for visible leaks: Check all radiators, valves, and pipework for damp patches or staining.
  • Check PRV discharge: Look at the PRV discharge pipe outside. If it is wet or dripping, the PRV may be passing water.
  • Test expansion vessel (basic): With the system depressurised, tap the expansion vessel. A completely waterlogged vessel will sound dull. A technician can check and recharge the air side.
  • Monitor pressure: After topping up, note the pressure cold and hot. Large swings suggest expansion vessel issues.

Note: Expansion vessel recharging or replacement and PRV replacement should be done by a professional.

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Repair Difficulty

Hard 4/5

Required Part

Expansion Vessel or Pressure Relief Valve
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