E78-181 Emergency

Potterton E78-181 Fault Code

Also written as E78181 — same fault.

The Potterton E78-181 fault code means: your boiler has detected that dangerous exhaust gases are not escaping correctly through the flue, so it has shut down for your protection.. 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 CFL60 - 100 (Yellow sleeve)
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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Potterton models that show the E78-181 fault code

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

Source

Potterton E78-181 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