Display not illuminated High

Potterton Display not illuminated Fault Code

Also written as DISPLAYNOTILLUMINATED — same fault.

The Potterton Display not illuminated fault code means: your boiler has no power going to it at all, meaning the screen is blank and it won't respond to any commands.. It appears on 3 Potterton models in our database.

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

Technical description: All power off.

What causes the Potterton Display not illuminated fault?

This fault occurs when the boiler's electrical heartbeat is interrupted, preventing the control system from waking up. The most common reason is a blown internal fuse or a failed main circuit board that can no longer distribute power. Occasionally, this is triggered by an external issue like a tripped circuit breaker or a faulty transformer failing to convert the voltage correctly.

This issue is more common during the autumn and winter months when electrical surges from storms or increased demand on the grid can damage sensitive internal components like the circuit board.

Typical repair cost £80-280 (including labour)

DIY fix possible

Check if your main electrical consumer unit has trippedEnsure the fused spur switch next to the boiler is turned onCheck the 3-amp fuse inside the boiler's wall switch

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Potterton models that show the Display not illuminated fault code

Click a model for the full fault code list and model-specific repair notes.

Source

Potterton Display not illuminated fault code information on this page is sourced and cross-checked against the official Potterton service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026