Common problems guide

The most common Potterton Ultra 2 30 DV problems

The faults most likely to send a Potterton Ultra 2 30 DV 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.
4 documented codes
4 most common
0 DIY-safe checks
4 engineer needed

The 4 most common faults

01
Lockout High Engineer

Your boiler has stopped working for safety reasons and has locked itself to prevent starting until a professional technician can investigate the internal fault.

Est. cost
£150-350
Parts
Ignition PCB, Gas Valve, Flame Sensing Electrode
Full guide for Lockout
02
Red light flashing High Engineer

Your boiler has stopped working because it failed to ignite, which means it is currently unable to provide you with any heating or hot water.

Est. cost
£120-250
Parts
Ignition electrode, Gas valve, Printed circuit board (PCB)
Full guide for Red light flashing
03
Lockout (Rapid Flashing Red) High Engineer

Your boiler has failed to start after three attempts, likely because it is struggling to find a stable gas supply or has air trapped in the system.

Est. cost
£120-250
Parts
Ignition electrode, Gas valve, PCB
Full guide for Lockout (Rapid Flashing Red)
04
Red LED: FLASHING High Engineer

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

Est. cost
£150-300
Parts
Pump, Central heating system filter, Overheat thermostat
Full guide for Red LED: FLASHING
Parts most often replaced

on the Potterton Ultra 2 30 DV

Ignition PCBGas ValveFlame Sensing ElectrodeIgnition electrodeGas valvePrinted circuit board (PCB)

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 4-code list for the Potterton Ultra 2 30 DV

Related guides

Boiler losing pressure → No hot water → When to replace → Symptom checker →