Potterton Kingfisher 2 RS60, RS80, RS100 Fault codes & diagnostics

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

Regular Natural Gas 17.6-29.3 kW 1990-2005 Discontinued
GC Numbers 41-590-3041-590-3141-590-32

Replaced by: Kingfisher Mf

The fault code is already on your display

Note it down before pressing reset — resetting clears the code immediately. How to read fault codes →

Severity at a glance

Each cell = one fault code. Hover to identify.
1 Emergency 15 High 1 Low
Just want the most common Potterton Kingfisher 2 RS60, RS80, RS100 faults?
The top 6 problems in plain English — with causes, DIY checks and repair costs.
Fault codes

All 17 documented codes

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A.(1)

Your boiler is unable to start because it cannot light the small pilot flame, meaning you will have no heating or hot water.

High DIY-safe £100-£250

What to check first

  1. Check that your home's main gas emergency control valve is in the 'on' position.
  2. Verify if other gas appliances, like a cooker or hob, are working to confirm gas supply.
  3. If you have a prepaid gas meter, ensure you have sufficient credit and the meter hasn't locked out.

Parts commonly replaced

  • Thermocouple
  • Pilot Injector
  • Gas Control Valve
  • Ignition Electrode

Related codes

Full explanation for A.(1)
A.(2)

Your boiler's small pilot flame is not staying lit, which is preventing the main burner from starting up to provide heat.

High DIY-safe £90-180

What to check first

  1. Locate the grey or white control knob on the boiler gas valve.
  2. Turn the knob to the 'Pilot' or 'Star' position and press it down firmly and completely.
  3. While holding the knob down, press the igniter button repeatedly until the pilot flame appears.
  4. Continue to hold the control knob down for 20-30 seconds after the flame is lit before slowly releasing it.

Parts commonly replaced

  • Thermocouple
  • Pilot Injector
  • Ignition Electrode
Full explanation for A.(2)
A.(3)

Your boiler is unable to start because the small starter flame is not lighting, likely due to a tiny blockage in the gas supply line.

High Engineer only £90-160

Parts commonly replaced

  • Pilot Injector
  • Thermocouple

Related codes

Full explanation for A.(3)
A.(4)

Your boiler is unable to start because the small pilot flame that ignites the main burner cannot be lit.

High Engineer only £90-180

Parts commonly replaced

  • Piezo Igniter
  • Ignition Lead
  • Spark Electrode
  • Pilot Injector

Related codes

Full explanation for A.(4)
A.(5)

Your boiler is unable to light the small ignition flame needed to start the main heating process.

High Engineer only £120-220

Parts commonly replaced

  • Ignition electrode
  • HT ignition lead
  • Gas valve

Related codes

Full explanation for A.(5)
A.(6)

Your boiler is unable to start its pilot flame or has shut down to prevent the system from getting too hot.

High DIY-safe £90-180

What to check first

  1. Locate the overheat thermostat reset button, usually hidden under a small plastic cap on the front or bottom panel.
  2. Press the reset button firmly until you hear a click.
  3. Attempt to relight the pilot light following the instructions on the boiler's internal door.

Parts commonly replaced

  • Thermocouple
  • Overheat Thermostat
  • Gas Valve

Related codes

Full explanation for A.(6)
B.(1)

Your boiler is failing to stay lit after you try to start it because the pilot light is going out as soon as you let go of the ignition button.

High DIY-safe £90-180

What to check first

  1. Locate the gas control knob on the boiler.
  2. Follow the lighting instructions on the boiler casing, ensuring you press the control knob in fully.
  3. Hold the control knob down for at least 20 to 30 seconds after the pilot flame appears before slowly releasing it.

Parts commonly replaced

  • Thermocouple
  • Magnetic valve
  • Pilot injector
Full explanation for B.(1)
B.(2)

Your boiler is failing to stay lit because its internal safety sensor cannot confirm the pilot light is active.

High Engineer only £90-180

Parts commonly replaced

  • Thermocouple
  • Gas Control Valve connection
  • Pilot Injector

Related codes

Full explanation for B.(2)
B.(3)

Your boiler is struggling to keep its small pilot flame lit, which prevents the main burner from firing up to heat your home.

High Engineer only £120-£250

Parts commonly replaced

  • Thermocouple
  • Pilot Injector
  • Gas Control Valve

Related codes

Full explanation for B.(3)
B.(4)

Your boiler's pilot light is going out as soon as you let go of the ignition button, preventing the main burner from firing up.

High Engineer only £90-160

Parts commonly replaced

  • Pilot injector
  • Thermocouple
Full explanation for B.(4)
B.(5)

Your boiler is failing to stay lit because the safety mechanism thinks it is unsafe to keep the gas flowing.

High Engineer only £90-180

Parts commonly replaced

  • Thermocouple
  • Gas control valve power unit
  • Magnetic latch
Full explanation for B.(5)
C.(1)

Your boiler is not firing up because the thermostat is turned too low or is currently switched off.

Low DIY-safe

What to check first

  1. Check the boiler thermostat dial on the front of the unit.
  2. Turn the thermostat dial clockwise to a higher setting.
  3. Ensure any external room thermostats or programmers are also set to 'ON' and turned up.
Full explanation for C.(1)
C.(2)

Your boiler's pilot light is on, but the main burner is not firing up because your external heating controls are not telling the boiler to start.

High DIY-safe £0-120

What to check first

  1. Check that your wall thermostat is turned up higher than the current room temperature.
  2. Ensure your programmer or heating timer is set to 'On' or 'Auto'.
  3. Check if the batteries in your wireless thermostat need replacing.

Parts commonly replaced

  • Room thermostat
  • Programmer/Timer
  • Motorised zone valve

Related codes

Full explanation for C.(2)
C.(3)

Your boiler's small pilot light is on, but the main burner is failing to ignite, meaning your heating and hot water will not work.

High Engineer only £180-350

Parts commonly replaced

  • S.I.T. Gas Control Valve
  • Solenoid Coil
Full explanation for C.(3)
C.(4)

Your boiler's pilot light is on, but the main heating burner is failing to ignite because the temperature control switch is broken or incorrectly reading the heat levels.

High Engineer only £140-£260

Parts commonly replaced

  • Control Thermostat
  • Thermostat Phial
  • Wiring harness

Related codes

Full explanation for C.(4)
C.(5)

Your boiler's small pilot light is on, but the main burner cannot engage to actually heat your home because the fuel path is obstructed.

High Engineer only £90-180

Parts commonly replaced

  • Main burner injector
  • Burner assembly cleaning

Related codes

Full explanation for C.(5)
D.(1)

Your boiler is not turning off when the water gets hot enough, which runs the risk of the system overheating.

Emergency Engineer only £120-220

Parts commonly replaced

  • Control Thermostat
  • Overheat Limit Thermostat
Full explanation for D.(1)