Grant Multi Pass Fault codes & diagnostics

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

System Oil 15-26 kW Discontinued

Replaced by: Vortex

Download the Grant Multi Pass 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 2 documented codes

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Lock-out

Your boiler has stopped working because it failed to ignite the flame during the starting process.

High Engineer only £150-300

Parts commonly replaced

  • Photo cell
  • Control box
  • Oil nozzle
  • Ignition electrodes
Full explanation for Lock-out
Lockout

Your boiler has stopped because it failed to ignite, so it has safely turned itself off to prevent a build-up of fuel.

High Engineer only £120-250

Parts commonly replaced

  • Ignition electrode
  • Photocell
  • Control box
  • Oil nozzle
Full explanation for Lockout