Potterton Performa 30 HE Fault codes & diagnostics

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

Combi Natural GasLPG 30 kW 2005-2011 Discontinued
GC Number 47-393-13

Replaced by: Promax Combi HE Plus

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.
1 Emergency 14 High 1 Medium
Just want the most common Potterton Performa 30 HE faults?
The top 6 problems in plain English — with causes, DIY checks and repair costs.
Fault codes

All 16 documented codes

Tap any card for details

LED / flash-pattern codes
neon flashing

Your boiler has detected that the water temperature has got too hot and has shut itself down as a safety precaution.

High DIY-safe £100-280

What to check first

  1. Wait for the boiler to cool down completely (at least 20 minutes)
  2. Turn the selector switch to the 'Reset' position and hold for 5 seconds
  3. Turn the selector switch back to the 'Hot Water' or 'Heating' position
  4. Check that your radiator valves are open and the system pressure is between 1 and 1.5 bar

Parts commonly replaced

  • Overheat Thermostat
  • Temperature Sensor (NTC)
  • Pump
  • Diverter Valve
Full explanation for neon flashing
neon flashing (Section B/C)

Your boiler is struggling to push water around your heating system because the water pump is either stuck or blocked by trapped air.

High Engineer only £150-250

Parts commonly replaced

  • Central heating pump
  • Flow switch microswitch
Full explanation for neon flashing (Section B/C)
neon flashing (Section E)

Your boiler is struggling to breathe because it cannot clear out exhaust gases properly, so it has safely shut itself down to prevent a hazard.

High Engineer only £120-250

Parts commonly replaced

  • Air pressure switch
  • Venturi
  • Fan assembly
  • Flue seals
Full explanation for neon flashing (Section E)
neon flashing (Section F)

Your boiler has stopped working because it is not receiving the gas it needs to create a flame or the internal valve responsible for controlling the fuel has failed.

Emergency Engineer only £180-350

Parts commonly replaced

  • Gas valve
  • PCB (Printed Circuit Board)
  • Wiring harness
Full explanation for neon flashing (Section F)
neon flashing (Section H/K)

Your boiler is trying to start but failing to light the flame, so it has safely shut itself down to prevent a gas buildup.

High Engineer only £150-300

Parts commonly replaced

  • Ignition electrode
  • Gas valve
  • PCB (Printed Circuit Board)
Full explanation for neon flashing (Section H/K)
neon flashing (Section I/M)

Your boiler is failing to stay lit because it cannot properly detect the flame or is struggling to drain away waste water, causing it to shut down for safety.

High Engineer only £120-250

Parts commonly replaced

  • Flame rectification electrode
  • Condensate trap
  • Printed Circuit Board
Full explanation for neon flashing (Section I/M)
neon flashing (Section J/M)

Your boiler has automatically turned itself off because it has detected that it is running too hot, possibly due to a blockage in the airflow or a problem with the internal water circulation.

High Engineer only £120-250

Parts commonly replaced

  • Overheat thermostat
  • Flue overheat thermostat
  • Pump
  • Diverter valve
Full explanation for neon flashing (Section J/M)
neons flashing (Section D)

Your boiler has detected a problem with its internal monitoring systems or airflow, causing it to shut down for safety reasons.

High Engineer only £150-£250

Parts commonly replaced

  • NTC Temperature Sensor
  • Fan Assembly
  • PCB
Full explanation for neons flashing (Section D)
Digital codes
24

Your boiler has stopped working because it either cannot detect a flame or the internal drainage pipe for waste water is blocked.

High DIY-safe £100-280

What to check first

  1. Check if your gas prepay meter has credit and that the external gas stopcock is open.
  2. Inspect the plastic condensate pipe outside for signs of freezing or blockages.
  3. Thaw a frozen external pipe with warm (not boiling) water and reset the boiler.

Parts commonly replaced

  • Flame Sensing Electrode
  • Gas Valve
  • Ignition Lead
Full explanation for 24
25

Your boiler has switched itself off because it has detected that a part inside has become too hot to operate safely.

High Engineer only £100-£250

Parts commonly replaced

  • Overheat Thermostat
  • Water Pump
  • Main Heat Exchanger
Full explanation for 25
26

Your boiler has stopped working because it cannot safely vent exhaust gases or the air-circulating fan has failed.

High Engineer only £180-£350

Parts commonly replaced

  • Fan assembly
  • Air pressure switch
  • Venturi tube
  • Printed Circuit Board (PCB)
Full explanation for 26
27

Your boiler has detected that either the water pressure is too low for the system to run or the internal pump is unable to circulate water effectively.

High DIY-safe £0-280

What to check first

  1. Check the pressure gauge on the front of the boiler; it should be between 1 and 1.5 bar.
  2. If the pressure is below 1 bar, use the filling loop underneath the boiler to top up the system.
  3. Turn the boiler off and back on again to reset the fault code.

Parts commonly replaced

  • Circulating Pump
  • Pressure Sensor
Full explanation for 27
28

Your boiler's hot water sensor has stopped working correctly, which means you may have inconsistent or no hot water.

Medium Engineer only £90-160

Parts commonly replaced

  • Hot water NTC thermistor
  • Wiring harness connectors
Full explanation for 28
29

Your boiler has detected a problem with the sensor that monitors the temperature of the water used for your radiators, causing the heating to stop working.

High Engineer only £90-160

Parts commonly replaced

  • Central Heating NTC Temperature Sensor
  • Sensor wiring harness
Full explanation for 29
Burner on neon NOT illuminated

Your boiler is not attempting to light the flame, which means you have no heating or hot water because the system has encountered an internal startup error.

High DIY-safe £120-300

What to check first

  1. Check if your gas credit has run out or if the gas isolation valve is open
  2. Turn the selector switch to the 'Reset' position and hold for 5 seconds
  3. Check that the system pressure is between 1 and 1.5 bar on the pressure gauge

Parts commonly replaced

  • Flame Sensing Electrode
  • Gas Valve
  • Printed Circuit Board (PCB)
Full explanation for Burner on neon NOT illuminated
neon illuminated

Your boiler has detected a general internal fault and has locked itself out to protect the system.

High DIY-safe £100-350

What to check first

  1. Turn the selector switch to the 'Reset' position (indicated by the 'R' symbol).
  2. Hold it for at least 5 seconds before releasing.
  3. Wait for the boiler to attempt to restart; if the light returns, call a Gas Safe engineer.

Parts commonly replaced

  • Ignition Electrode
  • Gas Valve
  • Printed Circuit Board (PCB)
Full explanation for neon illuminated