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Potterton · Error E09

Potterton E09 — what it means

Gas valve wiring or connection fault.

⚠ 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:

  • Try resetting the boiler once (your manual shows how)
  • If the code comes straight back, it needs a Gas Safe engineer — don't open the boiler yourself

🔧 If that doesn't fix it

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

    Most likely part: Gas valve

    Fixed repair price
    £408
    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 E10Outdoor (external) sensor fault.…Potterton E109Poor circulation around the system.…Potterton E110The boiler has overheated and tripped — often a stuck pump o…Potterton E117System pressure is too high (over about 2.9 bar).…
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