Baxi 600 System 2 Fault codes & diagnostics

1 fault code with plain-English explanations, severity ratings, DIY guidance, and repair cost estimates.

System Natural Gas 2023-present
Download the Baxi 600 System 2 manualThe official installation and service manual (PDF), the document these fault codes were read from. PDF

The fault code is already on your display

Note it down before pressing reset — resetting clears the code immediately. How to read fault codes →

Fault codes

All 1 documented codes

Tap any card for details

PC004

Your boiler has detected that the flame is not burning correctly within the combustion chamber, which poses a serious safety risk.

Emergency Engineer only £150-350

Parts commonly replaced

  • Burner seal
  • Gas valve
  • Electrodes

Related codes

Full explanation for PC004
Boiler cover options

Avoid the next call-out bill

Monthly cover means no unexpected bills when your boiler breaks down.

Approved partner
Domestic Appliance Guard
Unlimited call-outs, 24/7 helpline, no price-hike promise
Get a quote →

Affiliate links. We may earn a commission at no extra cost to you.