Baxi Bahama 80e / 105e Fault codes & diagnostics

10 fault codes with plain-English explanations, severity ratings, DIY guidance, and repair cost estimates.

Combi Natural GasLPG 24-31 kW 2001-2011 Discontinued

Replaced by: EcoBlue Advance Combi

Choose your boiler type

The Bahama 80e / 105e range comes in 2 types

Pick the one you have. The fault codes, GC numbers and manual differ by type.

Combi 105e 0 codes · 1 GC number Combi 80e 0 codes · 1 GC number
Each model has its own manual A family spans several manuals, one per model or generation. Pick your model above and its page has the manual its fault codes were read from.

The fault code is already on your display

Note it down before pressing reset — resetting clears the code immediately. How to read fault codes →

Severity at a glance

Each cell = one fault code. Hover to identify.
9 High 1 Medium
Just want the most common Baxi Bahama 80e / 105e faults?
The top 6 problems in plain English — with causes, DIY checks and repair costs.
Fault codes

All 10 documented codes

Tap any card for details

23

Your boiler has failed to light or maintain a flame, meaning it cannot heat your water or radiators for safety reasons.

High DIY-safe £120-350 Shared across the Bahama 80e / 105e range

What to check first

  1. Check if other gas appliances in your home, such as a hob, are working to ensure gas supply exists
  2. Check if your gas meter has credit if you use a pre-payment system
  3. Press the reset button once to see if the boiler restarts

Parts commonly replaced

  • Ignition Electrode
  • Flame Sensing Probe
  • Gas Valve
  • Printed Circuit Board (PCB)
Full explanation for 23
24

Your boiler has likely overheated, causing a safety sensor to automatically shut the system down to prevent damage.

High DIY-safe £90-180 Shared across the Bahama 80e / 105e range

What to check first

  1. Allow the boiler to cool down completely for 30 minutes
  2. Check that your radiator valves are open and not blocked by furniture
  3. Locate the reset button on the control panel and press it firmly

Parts commonly replaced

  • Overheat Thermostat (Limit Stat)
  • Circulating Pump
  • Thermistor (NTC Sensor)
Full explanation for 24
25

Your boiler has stopped working because it cannot safely clear away waste gases through the exhaust pipe.

High Engineer only £150-£350 Shared across the Bahama 80e / 105e range

Parts commonly replaced

  • Fan motor
  • Air pressure switch
  • Venturi tube
Full explanation for 25
26

Your boiler has detected that water is either not moving through the system properly or there is not enough pressure for it to operate safely.

High DIY-safe £100-£350 Shared across the Bahama 80e / 105e range

What to check first

  1. Check the pressure gauge on the front of the boiler; it should be between 1 and 1.5 bar.
  2. If the pressure is too low, use the filling loop underneath the boiler to carefully top it up.
  3. Ensure all radiator valves are open and that the pump has not become stuck after a long period of inactivity.

Parts commonly replaced

  • Central heating pump
  • Water pressure switch
  • Expansion vessel

Related codes

Full explanation for 26
27

Your boiler is having trouble measuring the temperature of your hot water, which usually means your taps will only run cold.

Medium Engineer only £90-160 Shared across the Bahama 80e / 105e range

Parts commonly replaced

  • Domestic Hot Water (DHW) NTC thermistor
  • Connecting wiring harness

Related codes

Full explanation for 27
28

Your boiler's internal thermometer for the heating system has stopped working correctly, meaning the boiler can no longer tell how hot the water is.

High Engineer only £90-160 Shared across the Bahama 80e / 105e range

Parts commonly replaced

  • Central Heating Temperature Sensor (NTC)
  • Connecting wiring harness
Full explanation for 28
Air Flow Monitor

Your boiler has detected a problem with how it is venting waste gases or taking in fresh air, causing it to shut down for safety.

High DIY-safe £100-280 Shared across the Bahama 80e / 105e range

What to check first

  1. Check the flue terminal outside your property to ensure it is not blocked by debris, leaves, or snow.
  2. Inspect the terminal mesh for any bird nests or physical obstructions.
  3. Restart the boiler using the selector switch to see if the fault clears.

Parts commonly replaced

  • Air Pressure Switch
  • Fan Assembly
  • Venturi Tube
Full explanation for Air Flow Monitor
Flame Failure

Your boiler has stopped working because it cannot light the gas burner or keep the flame burning safely.

High DIY-safe £90-280 Shared across the Bahama 80e / 105e range

What to check first

  1. Check that your gas emergency control valve is open and you have credit on your gas meter
  2. Press and hold the 'Reset' button (adjacent to the red neon light) for several seconds
  3. Ensure there are no obstructions around the external flue pipe outside your home

Parts commonly replaced

  • Ignition electrode
  • Flame sensing probe
  • Gas valve
  • Printed Circuit Board (PCB)
Full explanation for Flame Failure
Pump Fault or Low Pressure

Your boiler has stopped working because the water pressure is too low or the pump that moves water around your radiators has failed.

High DIY-safe £40-350 Shared across the Bahama 80e / 105e range

What to check first

  1. Locate the pressure gauge on the front of the boiler
  2. Find the filling loop (usually silver flexible hoses underneath the boiler)
  3. Slowly open the valves until the pressure gauge reaches between 1.0 and 1.5 bar, then close them tightly

Parts commonly replaced

  • Circulating Pump
  • Low Pressure Switch
  • Expansion Vessel Re-pressurisation
Full explanation for Pump Fault or Low Pressure
Safety Thermostat

Your boiler has shut down because it has detected it is getting too hot, usually due to a lack of water flow or a circulation blockage.

High DIY-safe £90-220 Shared across the Bahama 80e / 105e range

What to check first

  1. Check that your radiator valves are open to allow water to flow.
  2. Check the central heating pressure gauge is between 1 and 1.5 bar; top up if low.
  3. Turn the selector switch to the reset position for five seconds, then back to the desired setting.

Parts commonly replaced

  • Safety Thermostat (Limit Statutory)
  • Water Circulation Pump
  • Primary Heat Exchanger
Full explanation for Safety Thermostat
Status & diagnostic codes

10 operating states & engineer diagnostics

Not faults — these are normal operating states. Tap to expand.

10 Status Your boiler is currently unable to detect or heat the hot water correctly, meaning you will likely have no hot water available at your taps. 11 Status Your boiler is struggling to accurately measure the temperature of the water used for your radiators, causing it to shut down for safety reasons. 12 Status Your boiler is simply indicating that it has successfully completed its startup process and is currently in standby mode. 13 Status Your boiler is struggling to detect or maintain the hot water flow, meaning you may have issues with getting hot water from your taps. 14 Status Your boiler has detected that the water inside the heating system is getting too hot, so it has automatically shut down to prevent damage. 15 Status Your boiler is currently operating normally and the main burner is active to heat your water or radiators. 29 Status Your boiler has just been powered on or has restarted and is currently performing its initial system safety checks. 30 Status Your boiler is currently struggling to correctly detect or manage the demand for hot water, which may result in your taps running cold or the system failing to ignite when you turn a tap on. 31 Status Your boiler has detected an issue with the sensor responsible for monitoring the temperature of your central heating system. 32 Status Your boiler is operating normally and the burner is currently lit, meaning it is actively heating your water or radiators.