F7
Ideal Low Mains Voltage / PCB Supply Fault

Ideal boiler shows F7 and will not fire, often after power interruption

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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

Unstable mains supply, Loose electrical connections at fused spur, Faulty PCB power supply section, Incorrectly rated fuse or extension lead use

How to Fix / Troubleshooting

Safety first: Isolate the boiler at the fused spur before touching any electrical accessories. Do not remove the boiler case.

User checks:

  • Check fused spur: Ensure the boiler is connected directly to a switched fused spur with a 3A fuse, not via an extension lead or multi-plug.
  • Inspect fuse: Turn off power, remove the fuse from the spur, and visually check it. Replace with a new 3A fuse if blown.
  • Check for power dips: If lights flicker or other appliances reset, there may be a supply issue. Contact your electricity provider.
  • Reset the boiler: After confirming stable power, turn the boiler back on and reset.

Engineer tasks: If F7 persists, a Gas Safe engineer or qualified electrician should test the supply voltage at the boiler, inspect internal wiring, and replace the PCB if its power supply section is faulty.

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Repair Difficulty

Hard 4/5

Required Part

PCB (Printed Circuit Board)
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