Baxi Suprima 60 Fault codes & diagnostics

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

Regular Natural Gas 17.6 kW 1999-2010 Discontinued
GC Number 41-607-78

Replaced by: Baxi Potterton Assure

Download the Baxi Suprima 60 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 →

Just want the most common Baxi Suprima 60 faults?
The top 6 problems in plain English — with causes, DIY checks and repair costs.
Fault codes

All 4 documented codes

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Blocking - Mains Frequency incorrect or Air Switch Fault >1 min. or Reset button held in to force a restart

Your boiler has temporarily stopped working because it has detected an issue with the air flow inside or the reset button has been held down for too long.

High Engineer only £120-250

Parts commonly replaced

  • Air pressure switch
  • Flue terminal
  • PCB

Related codes

Full explanation for Blocking - Mains Frequency incorrect or Air Switch Fault >1 min. or Reset button held in to force a restart
Earth Fault or Mains Reversal

Your boiler has detected an issue with the electrical wiring or power supply, causing it to safely lock out and stop working.

High Engineer only £90-180

Parts commonly replaced

  • Fused Spur
  • Mains Power Cable
  • Printed Circuit Board (PCB)
Full explanation for Earth Fault or Mains Reversal
Lockout

Your boiler has stopped working and locked itself out for safety because it failed to ignite properly.

High DIY-safe £100-250

What to check first

  1. Check that your gas supply is working by testing another gas appliance like a hob.
  2. Locate the reset button (usually a small button or switch on the front panel).
  3. Press and hold the reset button for about 5 seconds, then release to see if the boiler fires up.

Parts commonly replaced

  • PCB
  • Spark generator
  • Ignition electrode

Related codes

Full explanation for Lockout