OFF High

Grant OFF Fault Code

The Grant OFF fault code means: your boiler has lost all power and is completely shut down, meaning it cannot provide any heating or hot water until the electrical supply is restored.. It appears on 6 Grant 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: Lack of electrical supply. Check presence of voltage in the L - N of the four pin plug. Check the conditions of the fuses. Check that safety thermostat is not in lockout.
Typical repair cost £90-200 (including labour)

Engineer required

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

Find a Gas Safe engineer

Search the official register for a qualified engineer in your area.

Gas Safe Register →
Boiler cover options

Avoid the next call-out bill

A cover plan would handle faults like OFF: no call-out fees, no surprise bills.

Approved partner
Domestic Appliance Guard
Unlimited call-outs, 24/7 helpline, no price-hike promise
Get a quote →

Affiliate links. We may earn a commission at no extra cost to you.

Grant models that show the OFF fault code

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

Source

Grant OFF 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