Potterton Puma 80/100 Fault codes & diagnostics

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

Combi Natural Gas 23-29 kW 1997-2005 Discontinued
GC Number 47-590-10

Replaced by: Potterton Puma i

Download the Potterton Puma 80/100 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 →

Just want the most common Potterton Puma 80/100 faults?
The top 6 problems in plain English — with causes, DIY checks and repair costs.
Fault codes

All 3 documented codes

Tap any card for details

All lights OFF

Your boiler has lost all power and is completely unresponsive, meaning it cannot provide heating or hot water until the electrical connection is restored.

High Engineer only £100-250

Parts commonly replaced

  • PCB Electronic Board
  • Internal Fuse F1
  • Mains terminal block
  • Fused spur switch
Full explanation for All lights OFF
Lockout

Your boiler has stopped working because it failed to start after three attempts, which is often caused by an interruption to the gas supply or a trapped air pocket.

High Engineer only £120-250

Parts commonly replaced

  • Ignition electrode
  • Gas valve
  • Printed Circuit Board
Full explanation for Lockout
RED LED on continuously

Your boiler has detected that it is running too hot and has safely shut itself down to prevent damage.

High Engineer only £120-250

Parts commonly replaced

  • Overheat Thermostat
  • NTC Temperature Sensor
  • Pump
Full explanation for RED LED on continuously
Status & diagnostic codes

2 operating states & engineer diagnostics

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

green light flashes rapidly Status Your boiler is attempting to start but failing to detect a flame, causing it to shut down for safety. green light On only Status Your boiler is operating normally and is currently active as it provides heating or hot water to your home.