Spare PCB Not Set High

Keston Spare PCB Not Set Fault Code

Also written as SPAREPCBNOTSET — same fault.

The Keston Spare PCB Not Set fault code means: your boiler's computer brain has been replaced or reset and needs to be told which specific model it is controlling before it can start working.. It appears on 2 Keston 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: Spare PCB Not Set - Switch off, wait 5s, switch on. Follow instructions in Section 3.19.
Typical repair cost £90-180 (including labour)

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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Keston models that show the Spare PCB Not Set fault code

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

Source

Keston Spare PCB Not Set 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 31 August 2026