Potterton Combi 80 Fault codes & diagnostics

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

Combi Natural Gas 24 kW 1994-2001 Discontinued
GC Number 47-393-01

Replaced by: Puma 80

The fault code is already on your display

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

Fault codes

All 2 documented codes

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Lockout

Your boiler has stopped working for safety reasons because it failed to light or became too hot, so it has purposefully shut itself off to protect your home.

High Engineer only £120-250

Parts commonly replaced

  • Ignition Electrode
  • Gas Valve
  • Limit Thermostat
  • PCB
Full explanation for Lockout
lockout light

Your boiler has stopped working because it cannot light its internal flame, which could be due to a gas supply issue or a safety cutout.

High Engineer only £120-250

Parts commonly replaced

  • Ignition electrode
  • Gas valve
  • PCB
  • Overheat thermostat
Full explanation for lockout light