EHC Air and Condensate Retention after Inactivity

Boiler makes gurgling noises and sometimes fails to start after being off for a long period.

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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

Air trapped in heat exchanger, Partially blocked condensate trap, Low system pressure, Inactive pump causing stagnation

How to Fix / Troubleshooting

Safety: Allow boiler to cool before bleeding or opening any components.

User checks:

  • Check and top up system pressure to 1.0–1.5 bar.
  • Bleed radiators to remove trapped air.

Engineer checks:

  • Bleed the boiler’s internal air vent and pump.
  • Clean the condensate trap and ensure free drainage.
  • Run the pump in test mode (if available on EHC models) to purge air.

After purging air and clearing condensate, the boiler should start more reliably without gurgling.

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Repair Difficulty

Medium 3/5

Required Part

Automatic Air Vent
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