Emergency
7.2.1 on Baxi 825 Combi

Your boiler has detected an issue with the gas supply or the combustion process, meaning it has safely shut down to prevent unsafe operation.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed

Act immediately

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

What the manual says

Manufacturer manual

Cherting the gas

Shared across the range
This code is shared by the boilers in this range, which use the same control board. It may not be printed in this exact variant’s manual.
Plain-English guidance below. Severity, DIY steps, costs and parts are our interpretation to help you act, not text from the manual.

Engineer required

This is a emergency severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

Find a Gas Safe engineer
Search the official register →
Boiler cover options

Avoid the next call-out bill

A cover plan would handle faults like 7.2.1: 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.

Related fault codes

E119View →E160View →E168View →

All 104 fault codes on the 825 Combi

Seeing a different code? Every code this model can display, in one place.

1.01.0.01.0.21.11.21.31.3.11.41.4.11.4.21.4.32.12.22.2.12.2.22.2.32.2.42.32.3.12.42.4.12.4.22.4.32.53.13.23.2.23.2.43.2.53.2.63.2.84.14.24.2.14.2.24.2.34.2.44.2.54.2.64.2.74.34.44.4.15.16.16.1.66.26.2.16.2.26.2.56.2.66.36.3.17.17.27.2.27.37.3.17.47.4.17.4.27.57.5.18.18.28.2.58.39.19.29.2.19.39.3.19.3.29.3.39.3.49.49.4.29.510.111.115202840110118125130133134135321384E15E20E28E110E118E125E128E130E133E160

Related guides you might find useful

Boiler keeps cutting out

Lockout fault with a reset-needed pattern.

Read →

Pilot light keeps going out

Older boilers — thermocouple, draught, gas supply.

Read →

Yellow or orange flame — CO safety

Safety-critical — turn off, read this.

Read →