Vokera Compact 24HE Fault codes & diagnostics

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

Combi Natural Gas 24 kW 2006-2009 Discontinued

Replaced by: Compact A

Download the Vokera Compact 24HE manualThe official installation and service manual (PDF), the document these fault codes were read from. PDF

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Fault codes

All 2 documented codes

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Check JP1

Your boiler has detected an internal configuration error, likely due to a loose link on the main computer board, which is preventing it from starting up correctly.

High Engineer only £120-250

Parts commonly replaced

  • PCB (Printed Circuit Board)
  • Wiring harness
Full explanation for Check JP1
Pressure < 0.5 bar

Your boiler has stopped working because the water pressure inside your heating system has dropped too low to operate safely.

High DIY-safe £80-150

What to check first

  1. Locate the filling loop, which is usually a flexible silver hose with one or two valves underneath the boiler.
  2. Slowly open the valve(s) to let mains water into the system until the pressure gauge needle sits between 1.0 and 1.5 bar.
  3. Close the valve(s) tightly and check that the boiler restarts.

Parts commonly replaced

  • Filling loop
  • Pressure relief valve
  • Pressure gauge
  • Expansion vessel
Full explanation for Pressure < 0.5 bar