Common problems guide

The most common Baxi Bahama 100 problems

The faults most likely to send a Baxi Bahama 100 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.
6 documented codes
6 most common
2 DIY-safe checks
4 engineer needed

The 6 most common faults

01
Pressure Gauge below 1 High DIY-safe

Your boiler has lost the water pressure it needs to circulate heat, which means it will stop working until the system is topped up.

What to try first

Locate the filling loop, which is a silver braided hose connecting two pipes underneath the boiler.Open the valves at both ends of the hose to let water into the system while watching the pressure gauge.Close both valves firmly once the needle sits between 1 and 1.5 bar.

Est. cost
£80-150
Parts
Filling loop, Pressure relief valve, Expansion vessel
Full guide for Pressure Gauge below 1
02
Red Light High Engineer

Your boiler has stopped working because it has detected an internal overheating issue or a failure to light the burner as a safety precaution.

Est. cost
£120-250
Parts
Overheat Thermostat, Ignition Electrode, Gas Valve
Full guide for Red Light
03
Flame Failure High Engineer

Your boiler has stopped working because it couldn't light the flame or keep it burning, so it has purposefully shut itself down for safety.

Est. cost
£120-250
Parts
Ignition electrode, Gas valve, Printed Circuit Board (PCB)
Full guide for Flame Failure
04
Pressure Gauge 3 or greater Emergency Engineer

Your boiler has become dangerously over-pressurised, meaning there is too much water inside the system.

Est. cost
£120-200
Parts
Pressure Relief Valve, Filling Loop
Full guide for Pressure Gauge 3 or greater
05
Green Light Low DIY-safe

Your boiler is working normally and simply letting you know that it is powered on and ready to provide heating or hot water.

What to try first

No action required as this is the standard operating status indicator.

Full guide for Green Light
06
Orange Light Low Engineer

Your boiler is working exactly as it should and is currently burning gas to heat your water or radiators.

Full guide for Orange Light
Parts most often replaced

on the Baxi Bahama 100

Filling loopPressure relief valveExpansion vesselOverheat ThermostatIgnition ElectrodeGas Valve

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 6-code list for the Baxi Bahama 100

Related guides

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