Baxi Suprima 60 Fault codes & diagnostics

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

Regular Natural Gas 17.6 kW 1999-2010 Discontinued
GC Number 41-607-78

Replaced by: Baxi Potterton Assure

Download the Baxi Suprima 60 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.
9 High 1 Medium 3 Low
Just want the most common Baxi Suprima 60 faults?
The top 6 problems in plain English — with causes, DIY checks and repair costs.
Fault codes

All 13 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 that 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 all radiator valves are open
  2. Ensure your system pressure is between 1 and 1.5 bar
  3. Press the reset button once the boiler has cooled down

Parts commonly replaced

  • Temperature NTC Sensor
  • Circulation Pump
  • PCB (Control Board)

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.

High DIY-safe £100-£250

What to check first

  1. Wait 30 minutes for the boiler to cool down fully.
  2. Ensure all radiator valves are fully open and there are no obstructions to airflow.
  3. Press the 'Reset' button on the front control panel firmly to restart the unit.

Parts commonly replaced

  • Overheat Thermostat
  • Circulation Pump
  • PCB (Printed Circuit Board)

Related codes

Full explanation for 2 red flashes
3 green flashes

Your boiler is temporarily losing its flame and is currently attempting to fix the issue itself.

Medium DIY-safe £120-350

What to check first

  1. Check that other gas appliances (like a gas hob) are working to ensure gas supply
  2. Monitor the boiler to see if it clears the fault and resumes operation
  3. If the fault persists and turns to a red light, attempt a single reset via the reset button

Parts commonly replaced

  • Flame Sensing Electrode
  • PCB (Control Board)
  • Gas Valve

Related codes

Full explanation for 3 green flashes
3 red flashes

Your boiler is failing to light the gas flame after several attempts, which means it will stay locked out to keep you safe.

High DIY-safe £120-280

What to check first

  1. Check if your gas supply is active by testing another gas appliance like a hob
  2. Press and hold the reset button for at least five seconds
  3. Ensure your system pressure is at the correct level if a gauge is visible

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 'handshake' problem between its internal electronics which should resolve itself automatically.

Low DIY-safe £180-350

What to check first

  1. Wait for the boiler to self-reset as this is often a temporary glitch
  2. If the light continues flashing, turn the power to the boiler off and back on at the main fused spur switch
  3. Monitor the boiler to see if the fault frequently recurs

Parts commonly replaced

  • Printed Circuit Board (PCB)
  • Control Knob/User Interface
Full explanation for 4 green flashes
5 green flashes

Your boiler has experienced a brief glitch in its internal electronic settings and is currently trying to fix itself automatically.

Low DIY-safe £0-350

What to check first

  1. Wait for the boiler to automatically reset itself
  2. If the flashing continues, turn the temperature control knob to 'Reset' for 5 seconds and then back to your desired setting
  3. Ensure there are no external power surges by checking if other appliances are affected

Parts commonly replaced

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

Your boiler's internal memory chip has failed or lost its settings, meaning the unit can no longer communicate with its own control board.

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 trying to reset itself automatically.

Low DIY-safe £0-120

What to check first

  1. Wait for the boiler to complete its self-reset process
  2. If the flashing continues for more than 15 minutes, turn the control knob to 'Reset' and then back to the desired setting
  3. Ensure there is power to the boiler and that the gas supply is active

Parts commonly replaced

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

Related codes

Full explanation for 6 green flashes
6 red flashes

Your boiler has encountered an internal electronic error that is preventing it from starting up correctly.

High Engineer only £180-350

Parts commonly replaced

  • Printed Circuit Board (PCB)
  • Ignition Lead
Full explanation for 6 red flashes
Digital codes
125

Your boiler is overheating because the water inside it is not moving around the system correctly.

High DIY-safe £150-350

What to check first

  1. Check that all radiator valves are fully open
  2. Check if the water pressure on the system gauge has dropped too low
  3. Ensure there is no trapped air by bleeding your radiators

Parts commonly replaced

  • Central heating pump
  • Printed Circuit Board (PCB)
  • Flow/Return thermistors

Related codes

Full explanation for 125
E1

Your boiler has become too hot and has shut down as a safety precaution to prevent damage.

High DIY-safe £90-250

What to check first

  1. Turn off the boiler and allow it to cool down completely.
  2. Bleed all radiators using a radiator key to remove trapped air.
  3. Check that your system pressure is at the correct level (usually 1.0 to 1.5 bar).
  4. Press the reset button on the boiler control panel.

Parts commonly replaced

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

Related codes

Full explanation for E1
E15

Your boiler's electronic control board is struggling to communicate with the valve that controls the gas supply, meaning it cannot ignite safely.

High Engineer only £180-350

Parts commonly replaced

  • Printed Circuit Board (PCB)
  • Gas Valve
  • Wiring Harness

Related codes

Full explanation for E15
Status & diagnostic codes

5 operating states & engineer diagnostics

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

1 green flash Status Your boiler is working normally and has simply reached the correct temperature to heat your home or water. 10 Status Your boiler is simply indicating that it has successfully detected power and is starting its initial startup sequence. 11 Status Your boiler is currently set to provide hot water but is failing to communicate correctly with your heating controls or hot water cylinder, meaning the system cannot complete the request to heat your water. 12 Status Your boiler is currently operating normally in central heating mode and does not have an active fault. 13 Status Your boiler is operating normally and the burner is currently lit, meaning there is no actual fault with the appliance.