Common problems guide

The most common Baxi Genesis 80 problems

The faults most likely to send a Baxi Genesis 80 into lockout — with plain-English causes, what to check first, estimated repair costs and whether you need a Gas Safe engineer.

This model is discontinued. Parts can be harder to source and expensive. If repair costs are mounting, a new A-rated boiler may be the smarter choice.
3 documented codes
3 most common
2 DIY-safe checks
1 engineer needed

The 3 most common faults

01
Red Light High Engineer

Your boiler has stopped working because it cannot light or maintain a flame, meaning you currently have no heating or hot water.

Est. cost
£120-250
Parts
Ignition electrode, Gas valve, Flame sensing probe
Full guide for Red Light
02
Orange Light Low DIY-safe

Your boiler is receiving power and should be operating normally, as this light typically indicates the appliance is switched on.

What to try first

Check that your thermostat is turned up high enough to call for heatEnsure the programmer or timer is set to an 'on' periodCheck that the mains power switch for the boiler is in the 'on' position

Est. cost
£0-80
Parts
External Thermostat, Timer/Programmer Unit
Full guide for Orange Light
Parts most often replaced

on the Baxi Genesis 80

Ignition electrodeGas valveFlame sensing probeExternal ThermostatTimer/Programmer Unit

Based on parts cited in our fault code database. Your engineer will confirm what's actually needed after diagnosis.

Call a Gas Safe engineer if…

  • You can smell gas or see signs of a leak
  • The Baxi shows an Emergency or High severity code
  • The boiler keeps locking out after repeated resets
  • You've tried the DIY checks and the fault hasn't cleared
  • There's visible water leaking from the boiler
  • The flame is yellow or orange instead of blue
See the full 3-code list for the Baxi Genesis 80

Related guides

Boiler losing pressure → No hot water → When to replace → Symptom checker →