How much does it cost to fix Ferroli error code F36?

Typical repair cost for the Ferroli F36 fault is £220-450 including labour.

F36 High

Ferroli F36 Fault Code

Q: What does the Ferroli F36 fault code mean?

Your boiler’s internal computer has detected a fault within its own circuitry, meaning it can no longer communicate with the boiler's components correctly.

The Ferroli F36 fault code means: your boiler’s internal computer has detected a fault within its own circuitry, meaning it can no longer communicate with the boiler's components correctly.. It appears on 4 Ferroli models in our database.

Technical description: Electronic CVBC trouble

Typical repair cost £220-450 (including labour)

Engineer required

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

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Ferroli models that show the F36 fault code

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

Arean Repair: £250-450
Maxima 35 S Repair: £250-450
Optima 201 Repair: £250-450
Optimax Repair: £220-450

Source

Ferroli F36 fault code information on this page is sourced and cross-checked against the official Ferroli service / installation manuals for each affected model.

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