26
Intergas Flow Temperature Too High / Flow Restriction

Boiler displays error code 26, frequent cycling and shutdown on temperature

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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

Blocked or scaled plate heat exchanger, Partially closed isolation valves, Sludged system pipework, Incorrect pump speed setting

How to Fix / Troubleshooting

Warning: High temperatures can cause burns. Allow the system to cool before touching radiators or pipework.

  • Check radiator balance: Ensure radiators are getting hot evenly. Very hot flow and cold returns can indicate poor circulation.
  • Open valves fully: Confirm that the boiler's flow and return isolation valves are fully open (engineer may need to check under the boiler).
  • Bleed radiators: Remove trapped air to improve circulation, then re-pressurise the system.
  • Engineer tasks: The engineer will check pump speed, clean or replace the plate heat exchanger, flush the system, and verify correct flow rates.
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Repair Difficulty

Hard 4/5

Required Part

Plate Heat Exchanger
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