Common problems guide

The most common Potterton Performa 28i problems

The faults most likely to send a Potterton Performa 28i 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 6 most common faults

01

neon flashing High Engineer

Your boiler is failing to register that water is flowing through the system, which prevents it from igniting to provide heating or hot water.

Est. cost: £150-250
Parts: Diverter valve microswitch, Flow switch diaphragm, Flow sensor

Full guide for neon flashing

02

neons flashing High Engineer

Your boiler has detected an issue with its internal airflow system and has shut down as a safety precaution.

Est. cost: £120-250
Parts: Air pressure switch, Venturi, Fan assembly

Full guide for neons flashing

03

10 High Engineer

Your boiler is struggling to detect the temperature of the water being heated, which means it has stopped providing hot water to your taps and shower.

Est. cost: £120-200
Parts: Domestic Hot Water (DHW) NTC Thermistor

Full guide for 10

04

Flame Failure High Engineer

Your boiler has stopped working because it failed to ignite the internal flame needed to heat your water.

Est. cost: £150-350
Parts: Ignition electrode, Gas valve, Printed circuit board (PCB)

Full guide for Flame Failure

05

Fault on Fan or Flue High Engineer

Your boiler is struggling to breathe safely, meaning it cannot clear away exhaust gases effectively and has shut down to prevent any risk.

Est. cost: £150-300
Parts: Fan assembly, Air pressure switch, Venturi

Full guide for Fault on Fan or Flue

06

neon flashing (1st instance) High Engineer

Your boiler is failing to stay lit because it cannot detect that a flame has been successfully established.

Est. cost: £150-250
Parts: Flame rectification electrode, Printed Circuit Board (PCB)

Full guide for neon flashing (1st instance)

Parts most often replaced

on the Potterton Performa 28i

Diverter valve microswitchFlow switch diaphragmFlow sensorAir pressure switchVenturiFan assembly

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 9-code list for the Potterton Performa 28i