Blank display High

Keston Blank display Fault Code

Also written as BLANKDISPLAY — same fault.

The Keston Blank display fault code means: your boiler has lost power entirely, which could be due to a simple tripped switch or an internal electrical failure.. It appears on 1 Keston model 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: No power from the boiler or mains power loss lasting more than 8 hours
Typical repair cost £100-£350 (including labour)

DIY fix possible

Check if other appliances in the house have powerCheck your home's main fuse box for a tripped circuit breakerEnsure the boiler's isolation switch (switched spur) is turned on

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Keston models that show the Blank display fault code

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

Source

Keston Blank display fault code information on this page is sourced and cross-checked against the official Keston service / installation manuals for each affected model.

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