GTV90 Emergency

Grant GTV90 Fault Code

The Grant GTV90 fault code means: your boiler's outdoor exhaust vent has likely become blocked, damaged, or disconnected, preventing the safe escape of exhaust gases.. It appears on 1 Grant model in our database.

Act immediately

Turn off your boiler and stop using gas appliances. Call a Gas Safe engineer now. This fault can be dangerous if ignored.

Technical description: Vertical terminal
Typical repair cost £150-300 (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 GTV90 fault code

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

Source

Grant GTV90 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 7 July 2026