Potterton Performa 24 Fault codes & diagnostics

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

Combi Natural Gas 24 kW 2001-2006 Discontinued
GC Numbers 47-393-0647-393-08

Replaced by: Promax Combi

Download the Potterton Performa 24 manualThe official installation and service manual (PDF), the document these fault codes were read from. 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.
10 High 4 Medium
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
47-393-06 Performa 24 2001–2006
47-393-08 Performa 28i 2001–2006

Appliance names and production years are taken from the UK Product Characteristics Database (the SAP/SEDBUK register). Where a GC number is also printed in this model's own manufacturer manual, both sources were checked to agree.

Just want the most common Potterton Performa 24 faults?
The top 6 problems in plain English — with causes, DIY checks and repair costs.
Fault codes

All 14 documented codes

Tap any card for details

LED / flash-pattern codes
50° neon flashing

Your boiler has stopped working because the water pressure inside the system has dropped too low.

High DIY-safe £0-120

What to check first

  1. Locate the filling loop (usually a silver flexible hose) underneath the boiler.
  2. Slowly open the one or two taps/levers on the hose until you hear water entering.
  3. Watch the pressure gauge and close the taps once it reaches between 1.0 and 1.5 bar.

Parts commonly replaced

  • Filling loop
  • Expansion vessel
  • Pressure relief valve

Related codes

Full explanation for 50° neon flashing
70° neon flashing

Your boiler has likely become too hot or water is not circulating correctly, causing it to shut down for safety.

High DIY-safe £100-240

What to check first

  1. Rotate the selector switch to the 'Reset' position for 5 seconds, then back to its original setting.
  2. Check that all radiator valves are fully open to ensure water can flow.
  3. Verify that the system pressure is between 1 and 1.5 bar on the pressure gauge.

Parts commonly replaced

  • Overheat Thermostat
  • Primary Flow Switch
  • Circulation Pump

Related codes

Full explanation for 70° neon flashing
80° neon flashing

Your boiler has tried to light but cannot detect a flame, which means it has locked itself out for safety.

High DIY-safe £100-280

What to check first

  1. Check if other gas appliances (like a hob) are working to confirm gas supply
  2. Ensure your gas meter has credit if you use a pre-payment meter
  3. Press and hold the Reset button/turn the selector switch to 'R' for five seconds

Parts commonly replaced

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

Related codes

Full explanation for 80° neon flashing
Preheat control neon flashing

Your boiler has detected an internal communication error or a disconnected jumper wire, which usually prevents the preheat function or the boiler from operating correctly.

Medium Engineer only £90-160

Parts commonly replaced

  • Wiring harness
  • Printed Circuit Board (PCB)
  • A10 Connector Lead
Full explanation for Preheat control neon flashing
Digital codes
10

Your boiler is likely struggling to provide hot water or maintain the correct temperature because its internal hot water thermometer has stopped working.

Medium Engineer only £90-160

Parts commonly replaced

  • Domestic Hot Water (DHW) NTC Sensor
  • Sensor Wiring Harness
Full explanation for 10
Flame Failure

Your boiler has stopped working because it cannot light its internal flame or keep it burning.

High Engineer only £120-250

Parts commonly replaced

  • Ignition electrode
  • Gas valve
  • PCB
  • Flame sensing electrode
Full explanation for Flame Failure
neon illuminated

Your boiler has encountered a temporary problem and requires a manual reset to restart its normal operation.

Medium DIY-safe

What to check first

  1. Turn the boiler selector switch to the 'Reset' position.
  2. Hold the switch in the 'Reset' position for at least 2 seconds.
  3. Release the switch and return it to your desired setting to see if the burner ignites.

Parts commonly replaced

  • Ignition electrode
  • Printed circuit board (PCB)
  • Flame sensor
Full explanation for neon illuminated
No neon illuminated

Your boiler has no power and the control panel lights are completely switched off.

High DIY-safe £80-250

What to check first

  1. Check if the boiler's power switch is turned on
  2. Check your home's main fuse box/consumer unit to see if a circuit has tripped
  3. Check the fuse in the spurred power socket next to the boiler

Parts commonly replaced

  • Main PCB
  • Internal Glass Fuse
  • Selector Switch
Full explanation for No neon illuminated
Pressure of 3 or greater

Your boiler has too much water inside it, which is causing the safety valve to leak or trigger to protect the system from bursting.

High DIY-safe £100-250

What to check first

  1. Check that the filling loop valves are fully closed and not letting in more water.
  2. Release excess pressure by bleeding a radiator into a container until the gauge reads between 1 and 1.5 bar.
  3. Check the discharge pipe outside for signs of leaking.
  4. If pressure continues to rise after bleeding, call a Gas Safe engineer to inspect the expansion vessel.

Parts commonly replaced

  • Safety Relief Valve (PRV)
  • Expansion Vessel
  • Filling Loop Tap
  • Secondary Heat Exchanger
Full explanation for Pressure of 3 or greater
Reset

Your boiler has stopped working because it failed to light the flame or keep it burning.

High Engineer only £120-250

Parts commonly replaced

  • Ignition electrode
  • Gas valve
  • PCB
Full explanation for Reset
Safety thermostat activated

Your boiler has switched itself off because it got too hot, which is a built-in safety feature to prevent damage or dangerous overheating.

High Engineer only £120-250

Parts commonly replaced

  • Safety thermostat
  • Pump
  • Diverter valve
  • System filter
Full explanation for Safety thermostat activated
Status & diagnostic codes

18 operating states & engineer diagnostics

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

11 Status Your boiler has stopped heating because it is struggling to accurately measure the temperature of the water circulating to your radiators. 12 Status Your boiler is simply performing a standard start-up sequence after being powered on and is operating normally. 13 Status Your boiler is struggling to correctly detect or maintain the flow of hot water to your taps and showers. 14 Status Your boiler has detected that the temperature of the water flowing to your radiators has risen too quickly, causing the system to temporarily shut down as a safety precaution. 15 Status Your boiler is operating normally and is currently firing up to heat your water or radiators. 23 Status Your boiler has attempted to light but has failed to detect a flame, causing it to shut down for safety. 24 Status Your boiler has likely overheated, causing it to shut down automatically as a safety precaution. 25 Status Your boiler has stopped working because it cannot safely clear away exhaust fumes or the internal fan has failed to start. 26 Status Your boiler has switched itself off because the water pressure is too low or the pump that moves water around your radiators isn't working correctly. 27 Status Your boiler is struggling to correctly measure the temperature of your hot water, which usually means your taps will only provide lukewarm or cold water. 28 Status Your boiler has detected that the part responsible for measuring the temperature of your heating water is no longer working correctly, causing the system to stop as a safety precaution. 29 Status Your boiler is simply performing a routine system check while it starts up, which is a normal part of the power-on sequence. 30 Status Your boiler is signalling that it is currently operating in hot water mode and is working as expected. 31 Status Your boiler is currently struggling to detect the request for heating, meaning it is failing to ignite or sustain the warming of your home's radiators. 32 Status Your boiler is simply indicating that the main burner is currently lit and operating correctly to heat your water or home. Burner On Status Your boiler is working normally and the burner is currently lit to provide heating or hot water. Power On Status Your boiler is receiving electrical power and is ready for normal operation. Temperature Control Diagnostic Your boiler has sensed a temperature issue and has likely locked out to prevent overheating.