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Potterton · Error E117

Potterton E117 — what it means

System pressure is too high (over about 2.9 bar).

⚠ This is the likely cause from the code — a Gas Safe registered engineer confirms it on site. If you can smell gas, stop and ring 0800 111 999.

✅ Try these first — they're free

Often clears it without a callout:

  • Bleed a radiator to bring the pressure down to about 1.5 bar
  • If it stays high, an engineer should check the expansion vessel and pressure valve

🔧 If that doesn't fix it

The likely cause is one of these — the engineer confirms which:

    Most likely part: Expansion vessel or pressure valve

    Fixed repair price
    £144
    Inc. VAT — part & labour, no surprise callout fee. You only pay if you go ahead.
    A vetted Gas Safe engineer who covers your postcode will call you back to arrange the repair. No callout fee — you only pay if you go ahead.

    Other Potterton fault codes

    Potterton E09Gas valve wiring or connection fault.…Potterton E10Outdoor (external) sensor fault.…Potterton E109Poor circulation around the system.…Potterton E110The boiler has overheated and tripped — often a stuck pump o…
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