Baxi Bermuda Fault codes & diagnostics

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

Regular Natural Gas 10-15 kW 1997-2002 Discontinued
GC Number 44-075-01
Download the Baxi Bermuda manual The official installation & service manual (PDF) — the exact document these fault codes were verified against. PDF

This boiler uses LED flash patterns

Count the flashes in one repeating group before the pause. That number is your fault code. Do not reset until you have noted it. How to read fault codes →

Severity at a glance

Each cell = one fault code. Hover to identify.
7 High 1 Medium 3 Low
Versions & GC numbers

Which version do you have?

The GC number on your boiler's data badge identifies the exact appliance and production years, as recorded in the UK Product Characteristics Database.

GC number Appliance (register name) Produced
44-075-01 Bermuda Inset 2 50/4 1997–2002
Just want the most common Baxi Bermuda faults?
The top 6 problems in plain English — with causes, DIY checks and repair costs.
Fault codes

All 11 documented codes

Tap any card for details

LED / flash-pattern codes
1 red flash

Your boiler has detected that it is getting too hot or the water isn't moving through the system properly, causing it to shut down for safety.

High DIY-safe £120-280

What to check first

  1. Check that your radiator valves are open
  2. Ensure your system water pressure is within the green zone (usually 1.0 to 1.5 bar)
  3. Perform a reset by turning the control knob to 'R' or the reset position for five seconds

Parts commonly replaced

  • NTC Temperature Sensor
  • Circulation Pump
  • Overheat Thermostat

Related codes

Full explanation for 1 red flash
2 red flashes

Your boiler has become too hot and has automatically shut down to prevent damage or unsafe operation.

High DIY-safe £120-350

What to check first

  1. Check that all radiator valves are open and not blocked by furniture
  2. Ensure the system water pressure is between 1 and 1.5 bar
  3. Press the reset button or turn the control knob to 'R' for five seconds

Parts commonly replaced

  • Overheat Thermostat
  • Circulation Pump
  • Thermistor (NTC Sensor)

Related codes

Full explanation for 2 red flashes
3 green flashes

Your boiler is struggling to keep its flame lit and is currently trying to fix itself automatically.

Medium DIY-safe £80-200

What to check first

  1. Monitor the boiler to see if it resets itself automatically
  2. Check that other gas appliances in the home are working correctly to ensure gas supply
  3. If the fault persists or changes to 3 red flashes, contact a Gas Safe engineer

Parts commonly replaced

  • Flame sensing electrode
  • Gas valve
  • Burner

Related codes

Full explanation for 3 green flashes
3 red flashes

Your boiler is failing to light the burner after several attempts, which means your heating and hot water will not work.

High DIY-safe £120-280

What to check first

  1. Check that your gas prepayment meter has credit (if applicable)
  2. Ensure all external gas isolation valves are turned to the 'on' position
  3. Press and hold the reset button or turn the control knob to 'R' for five seconds

Parts commonly replaced

  • Ignition Electrode
  • Gas Valve
  • PCB (Printed Circuit Board)

Related codes

Full explanation for 3 red flashes
4 green flashes

Your boiler is having a temporary 'conversation' issue between its internal computer parts and should fix itself automatically in a moment.

Low DIY-safe £0-120

What to check first

  1. Wait for the boiler to automatically reset itself
  2. Turn the power to the boiler off and back on again at the fused spur switch
  3. Ensure no buttons on the control panel are stuck or being held down

Parts commonly replaced

  • Control Interface
  • Printed Circuit Board (PCB)

Related codes

Full explanation for 4 green flashes
4 red flashes

Your boiler has stopped working because the fan that helps remove exhaust gases is not spinning correctly or communicating with the control board.

High Engineer only £180-350

Parts commonly replaced

  • Fan assembly
  • Air Pressure Switch
  • Main PCB

Related codes

Full explanation for 4 red flashes
5 green flashes

Your boiler has experienced a temporary electronic glitch and is currently trying to reset itself to find the correct settings.

Low DIY-safe £0-120

What to check first

  1. Wait for the boiler to complete its automatic self-reset process.
  2. If the fault persists, turn the boiler off at the fused spur switch for 30 seconds and turn it back on.
  3. Ensure there are no external electrical interference sources near the unit.

Parts commonly replaced

  • Printed Circuit Board (PCB)

Related codes

Full explanation for 5 green flashes
5 red flashes

Your boiler's internal memory chip has developed a communication fault, preventing the system from running safely.

High Engineer only £180-350

Parts commonly replaced

  • Parameter Storage Unit (PSU)
  • Main Printed Circuit Board (PCB)

Related codes

Full explanation for 5 red flashes
6 green flashes

Your boiler has encountered a minor temporary glitch and is currently trying to restart itself automatically.

Low DIY-safe £0-120

What to check first

  1. Wait up to 15 minutes for the boiler to automatically reset itself
  2. Turn the power to the boiler off and back on at the fused spur switch
  3. Monitor the lights to see if the flashing pattern changes to a steady light

Parts commonly replaced

  • No parts usually required
  • Printed Circuit Board (PCB)

Related codes

Full explanation for 6 green flashes
Digital codes
128

Your boiler started to provide heat but the flame went out unexpectedly while it was running.

High Engineer only £120-£350

Parts commonly replaced

  • Flame sensing electrode
  • Gas valve
  • PCB
  • Condensate trap

Related codes

Full explanation for 128
Status & diagnostic codes

1 operating states & engineer diagnostics

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

1 green flash Status Your boiler has reached its required temperature and has temporarily stopped firing to prevent overheating, which is a normal part of its operation.