Common problems guide

The most common Potterton Puma 80/100 problems

The faults most likely to send a Potterton Puma 80/100 into lockout — with plain-English causes, what to check first, estimated repair costs and whether you need a Gas Safe engineer.

This model is discontinued. Parts can be harder to source and expensive. If repair costs are mounting, a new A-rated boiler may be the smarter choice.

The 3 most common faults

01

Lockout High Engineer

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.

Est. cost: £120-250
Parts: Ignition electrode, Gas valve, Printed Circuit Board

Full guide for Lockout

02

RED LED on continuously High Engineer

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

Est. cost: £120-250
Parts: Overheat Thermostat, NTC Temperature Sensor, Pump

Full guide for RED LED on continuously

03

All lights OFF High Engineer

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

Est. cost: £100-250
Parts: PCB Electronic Board, Internal Fuse F1, Mains terminal block

Full guide for All lights OFF

Parts most often replaced

on the Potterton Puma 80/100

Ignition electrodeGas valvePrinted Circuit BoardOverheat ThermostatNTC Temperature SensorPump

Based on parts cited in our fault code database. Your engineer will confirm what's actually needed after diagnosis.

Call a Gas Safe engineer if…

You can smell gas or see signs of a leak
The Potterton shows an Emergency or High severity code
The boiler keeps locking out after repeated resets
You've tried the DIY checks and the fault hasn't cleared
There's visible water leaking from the boiler
The flame is yellow or orange instead of blue

See the full 3-code list for the Potterton Puma 80/100