Potterton Performa SL HE 9 2 Fault codes & diagnostics

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

Regular Natural Gas 9.2 kW 2008-2011 Discontinued
GC Numbers 41-592-0541-592-0641-592-0741-592-0841-592-0941-592-10

Replaced by: Promax SL

Download the Potterton Performa SL HE 9 2 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.
13 High

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
41-592-05 Performa 9 SL HE 2008–2011
41-592-06 Performa 12 SL HE 2008–2011
41-592-07 Performa 15 SL HE 2008–2011
41-592-08 Performa 18 SL HE 2008–2011
41-592-09 Performa 21 SL HE 2008–2011
41-592-10 Performa 24 SL HE 2008–2011

All 13 documented codes

Tap any card for details

Lockout (Red) flashing

Your boiler has sensed it is getting too hot and has shut itself down as a safety precaution.

High DIY-safe £120-280

What to check first

  1. Check that all radiator valves are fully open to allow water to flow.
  2. Ensure the system pressure is between 1 and 1.5 bar on the pressure gauge.
  3. Turn the control knob to the 'Reset' position for five seconds and then back to 'On'.

Parts commonly replaced

  • Overheat Thermostat
  • Circulation Pump
  • Thermistor (NTC Sensor)
Lockout (Red) light flash

Your boiler has automatically turned itself off because internal sensors detected it was getting too hot, likely due to a flow restriction or a faulty sensor.

High Engineer only £120-250

Parts commonly replaced

  • Overheat Thermostat
  • Pump
  • Diverter Valve
Air Proving LOCKOUT

Your boiler has stopped working because it cannot confirm that harmful exhaust gases are being safely cleared through the flue pipe.

High Engineer only £120-280

Parts commonly replaced

  • Air Pressure Switch
  • Fan Assembly
  • Venturi Tube
APS Stuck Fault

Your boiler has stopped working because its internal safety switch is stuck and cannot confirm it is safe to start the burner.

High Engineer only £120-£240

Parts commonly replaced

  • Air Pressure Switch (APS)
  • Venturi tube
  • Fan assembly
Casting Thermistor Fault

Your boiler has detected a problem with a temperature sensor on the main internal heat exchanger, causing it to shut down for safety.

High Engineer only £90-180

Parts commonly replaced

  • Casting Thermistor (NTC Sensor)
  • Wiring Harness
  • Main PCB

Related codes

False Flame Fault

Your boiler thinks a flame is present when it shouldn't be, causing the system to shut down for safety purposes.

High Engineer only £120-280

Parts commonly replaced

  • Flame Sensing Electrode
  • Printed Circuit Board (PCB)
  • Gas Valve
Flow Thermistor Fault

Your boiler has switched itself off because the internal temperature sensors are giving conflicting or unusual readings, meaning it cannot safely regulate the heat.

High Engineer only £90-160

Parts commonly replaced

  • Flow Thermistor (NTC Sensor)
  • Wiring Harness
  • Main PCB

Related codes

Ignition LOCKOUT

Your boiler has stopped working because it failed to light the flame, which could be due to a simple issue like a gas supply problem or a fault with the internal ignition components.

High Engineer only £120-250

Parts commonly replaced

  • Ignition electrode
  • Gas valve
  • PCB
Lockout (Red) light on

Your boiler has stopped working because it couldn't light the flame, which means your heating and hot water will not turn on.

High Engineer only £120-250

Parts commonly replaced

  • Ignition electrode
  • Gas valve
  • Printed Circuit Board (PCB)
Overheat LOCKOUT

Your boiler has detected that it has become dangerously hot and has automatically shut itself down to prevent damage.

High Engineer only £120-250

Parts commonly replaced

  • Overheat thermostat
  • Pump
  • PCB
  • System diverter valve
PCB Fault

Your boiler has experienced an internal computer failure and has shut down for safety, meaning it will no longer provide heating or hot water.

High Engineer only £250-450

Parts commonly replaced

  • Main Printed Circuit Board (PCB)

Related codes

Water Circulation LOCKOUT

Your boiler has switched itself off because it has detected that water is failing to move through the system correctly, causing it to overheat.

High DIY-safe £120-350

What to check first

  1. Check that all radiator valves are open and not turned off.
  2. Ensure your system water pressure is within the green zone (typically 1.0 to 1.5 bar).
  3. Press the reset button to see if the fault clears after the system has cooled down.

Parts commonly replaced

  • Circulating Pump
  • Casting Thermistor
  • Primary Heat Exchanger (if blocked)

Related codes

3 operating states & engineer diagnostics

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