How much does it cost to fix Grant error code C2849?

Typical repair cost for the Grant C2849 fault is £180-450 including labour.

C2849 High

Grant C2849 Fault Code

Q: What does the Grant C2849 fault code mean?

Your boiler has stopped working because of a communication failure between its internal electronic brains and a fault in the ignition system.

The Grant C2849 fault code means: your boiler has stopped working because of a communication failure between its internal electronic brains and a fault in the ignition system.. It appears on 2 Grant models in our database.

Technical description: Fault C; Chassis CodeProblem is controller area network wiring bus and modules.fault two; MFG – Manufacturer SpecificFault eight; Ignition System Or Misfirefault four; BBV Sensor Circuit Low Voltagefault nine; Kick-Down Switch Failed Short

What causes the Grant C2849 fault?

This fault occurs when the boiler's internal computer loses the ability to talk to the ignition components due to an electrical communication break. The most common reason is a hardware failure in the main control board or a loose connection in the internal wiring, which prevents the boiler from safely starting the burner.

Typical repair cost £180-450 (including labour)

Engineer required

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

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Grant models that show the C2849 fault code

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

Source

Grant C2849 fault code information on this page is sourced and cross-checked against the official Grant service / installation manuals for each affected model.

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