E1 218
Worcester Bosch
Air Pressure Switch / Fan Proving Fault
Boiler displays E1 218, fan runs but ignition does not proceed correctly.
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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 flue or air intake, Faulty air pressure switch, Split or blocked pressure tubing, Faulty fan
How to Fix / Troubleshooting
Safety first: Isolate power. Do not dismantle the flue or sealed combustion chamber unless qualified.
- Visual flue check: Confirm the flue terminal is clear and firmly fixed. Look for signs of water ingress or corrosion around the flue.
- Listen for fan: When there is a demand for heat, you should hear the fan start. If the fan is silent, it may have failed and needs replacement by an engineer.
- Condensate check: Ensure condensate trap and pipe are not blocked, as backpressure can affect the air pressure switch.
- Engineer tasks: A Gas Safe engineer should test the air pressure switch, inspect and replace pressure tubing if perished, verify fan speed and operation, and check flue integrity.
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Repair Difficulty
Professional Required
5/5
Required Part
Air Pressure Switch
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