Baxi Profile Fault codes & diagnostics

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

Regular Natural Gas 11-23 kW 1988-2003 Discontinued

Replaced by: Potterton Profile Prima

No manual available yet We don't hold the official service manual for this model yet. We're sourcing it — check back soon.

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.
6 High 1 Medium 3 Low
Just want the most common Baxi Profile 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

1 red flash

Your boiler has likely overheated or a sensor has failed, causing the system to shut down for safety.

High DIY-safe £120-250

What to check first

  1. Check that all radiator valves are open to ensure water can flow.
  2. Allow the boiler to cool down for at least 20 minutes.
  3. Press the reset button or turn the mains power off and back on.

Parts commonly replaced

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

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 safety issues.

High DIY-safe £120-280

What to check first

  1. Check that all radiator valves are open to allow water to circulate.
  2. Ensure your system pressure is at the correct level (usually 1 to 1.5 bar).
  3. Once the boiler has cooled down, press the reset button on the front or underside of the unit.

Parts commonly replaced

  • Overheat Thermostat
  • Circulating Pump
  • Thermistor

Related codes

Full explanation for 2 red flashes
3 green flashes

Your boiler has temporarily lost its flame and is currently trying to restart itself automatically.

Medium DIY-safe £90-250

What to check first

  1. Check that your external gas supply is turned on (e.g. at the meter)
  2. Wait for the boiler to attempt an automatic reset
  3. Monitor the display to see if the code clears or turns to a solid red fault

Parts commonly replaced

  • Flame sensing electrode
  • Ignition lead
  • Gas valve

Related codes

Full explanation for 3 green flashes
3 red flashes

Your boiler has tried to start up several times but cannot create a flame, meaning your heating and hot water will not work until it is reset or repaired.

High DIY-safe £100-£350

What to check first

  1. Check if other gas appliances in your home, like a hob, are working to ensure gas is reaching the property
  2. Check if your gas meter has credit
  3. Turn the selector switch to the reset position for five seconds, then turn it back to the 'on' position

Parts commonly replaced

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

Related codes

Full explanation for 3 red flashes
4 green flashes

Your boiler is having a temporary moment of confusion between its internal brains, but it should fix itself automatically in a few minutes.

Low DIY-safe £0-120

What to check first

  1. Wait up to 10 minutes for the boiler to automatically reset the communication error
  2. Turn the power switch to the boiler off and back on again once
  3. Ensure there is no heavy electrical interference appearing near the boiler casing

Parts commonly replaced

  • Printed Circuit Board (PCB)
  • Control Interface

Related codes

Full explanation for 4 green flashes
5 green flashes

Your boiler's internal computer has had a temporary communication glitch and is attempting to restart itself.

Low DIY-safe £180-350

What to check first

  1. Wait up to 10 minutes for the boiler to automatically self-reset
  2. Switch the main electrical power to the boiler off and back on again
  3. Ensure your household electricity supply is stable and not fluctuating

Parts commonly replaced

  • Printed Circuit Board (PCB)
Full explanation for 5 green flashes
5 red flashes

Your boiler's computer memory has developed a internal communication error and can no longer read its own settings.

High Engineer only £180-350

Parts commonly replaced

  • Parameter Storage Unit (PSU)
  • 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 pausing before it attempts to restart itself automatically.

Low DIY-safe £60-120

What to check first

  1. Wait up to 15 minutes to see if the boiler resets itself automatically
  2. Ensure your decorative door or case is fully closed as some models have a safety cutout
  3. Check that your external heating controls or thermostat are calling for heat

Parts commonly replaced

  • External controls
  • Wiring connections

Related codes

Full explanation for 6 green flashes
6 red flashes

Your boiler has detected an internal communication or electrical problem that is preventing it from starting up safely.

High Engineer only £120-280

Parts commonly replaced

  • Printed Circuit Board (PCB)
  • Wiring Harness
  • Ignition Lead

Related codes

Full explanation for 6 red flashes
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 set temperature and is temporarily resting because your home is already warm enough.