How to Fix Potterton E110 Fault Code (UK)
Potterton showing E110 — Overheat. UK diagnosis, likely spare (flow NTC) and step-by-step reset.
Potterton
What the code means
E110 on a Potterton indicates overheat. The boiler locks out to protect the heat exchanger and, on gas faults, to comply with the Gas Safety (Installation and Use) Regulations. Always reset to confirm the code is live, not historical.
Likely spare
The most common fix is the flow NTC. Check the exploded diagram against the GC number on the data plate before ordering — Potterton revised parts on Potterton units mid-production.
Fix procedure
Bleed CH, check pump PWM.
Log the fault and reset. If the code returns within 24 hours, escalate to full electrical diagnosis with a manometer and multimeter.
Frequently asked questions
- Can I reset E110 myself?
- You can press the reset button up to 3 times. If E110 returns, the boiler needs a Gas Safe engineer — it is illegal to repair gas components without registration.
- Is the part covered under warranty?
- Potterton standard warranty is 2–10 years depending on model. Registered installations get the full term. Check the sticker inside the case.
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