Potterton Boiler Fault Codes | Wokingham Local Expert
If your Potterton boiler is flashing an error code or suddenly stopped heating your home, don't panic. Many faults are easy to understand — and some you can fix yourself.
This guide is tailored for homeowners in Wokingham and nearby areas like Earley, Woodley, and Winnersh. Our experienced engineers at Thermo-Tec Plumbing and Heating are Gas Safe registered and ready to help if you need professional support.
Common Potterton Boiler Fault Codes
Potterton boilers (like the Promax, Performa, and Gold series) use alphanumeric fault codes to indicate specific issues. Here are the most common ones we encounter in Wokingham homes:
E119 – Low Water Pressure
What it means: The boiler’s water pressure is below the safe minimum level (typically under 1.0 bar).
Likely causes:
Bleeding radiators recently
Minor leak in pipework
Loss of pressure over time
Quick fix:
Locate the filling loop (silver braided hose)
Open the valves slowly to increase pressure to ~1.5 bar
Close both valves and reset the boiler
If pressure keeps dropping, it may indicate a hidden leak or expansion vessel fault.
E133 – Ignition Failure / Gas Supply Issue
What it means: The boiler is failing to ignite or the flame has been lost.
Possible causes:
Gas meter off
Frozen condensate pipe
Faulty ignition lead or gas valve
Blocked flue
What to try:
Check your gas supply (other gas appliances working?)
Defrost the condensate pipe if it’s cold outside
Press and hold the reset button
If the fault recurs, you’ll likely need an engineer to investigate ignition components or valve function.
E160 – Fan Fault
What it means: The fan isn’t running or is malfunctioning — a safety issue since the fan expels flue gases.
You’ll need a heating engineer to:
Test fan wiring and PCB
Replace the fan if needed
Check for blockages in the flue
E125 – Circulation Fault
What it means: The boiler detects a lack of water movement through the system.
Common causes:
Airlock in pipework
Failed pump
Dirty system water/sludge
Fix:
Try bleeding radiators. If that doesn’t help, call a professional — pump replacement or a power flush may be needed.
When to Call us your Local Gas Safe Engineer in Wokingham
If you're seeing recurring fault codes, unusual noises, smells, or a total system shutdown, it's time to call a qualified heating engineer.
At Thermo-Tec Plumbing & Heating, we’re Gas Safe registered and experienced with Ideal fault codes. We cover Wokingham, Lower Earley, Woosehill, and surrounding villages.
Need a Potterton Boiler Repair in Wokingham?
If your Baxi boiler is showing a fault code or refusing to fire up, we’re here to help.
Call Thermo-Tec today on 07850116944 for Potterton boiler repairs in Wokingham and surrounding areas.
FAQs – Potterton Faults
Q: What should I do if my Potterton boiler shows E119?
A: Top up the pressure via the filling loop. If it drops again, get a leak inspection.
Q: Can I fix E133 myself?
A: Check for frozen pipes or gas issues, then reset. Persistent faults need an engineer.
Q: Is my Potterton boiler too old to fix?
A: We can repair many models, but if your unit is over 15 years old, a replacement may be more cost-effective.