Flue blockage Emergency

Potterton Flue blockage Fault Code

Also written as FLUEBLOCKAGE — same fault.

The Potterton Flue blockage fault code means: your boiler has detected that waste gases are not escaping correctly through the flue, so it has safely shut itself down to prevent harmful fumes from entering your home.. It appears on 1 Potterton 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: Products Discharge Safety Device (TTB) operates; boiler goes to lockout (Red LED illuminated, requires manual reset)
Typical repair cost £120-250 (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 Flue blockage: 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.

Potterton models that show the Flue blockage fault code

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

Source

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

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026