Heatline Capriz 2 24c Fault codes & diagnostics

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

Combi Natural Gas 2015-present
GC Number 47-157-27
Download the Heatline Capriz 2 24c user guideThe manufacturer's user instructions (PDF). We don't hold the installation and service manual for this model yet. PDF

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Fault codes

All 2 documented codes

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F.22

Your boiler has detected that there is not enough water in the system to operate safely and has shut down as a precaution.

High DIY-safe £0-120

What to check first

  1. Locate the filling loop (the flexible silver hose) underneath the boiler.
  2. Slowly open the one or two taps on the filling loop until you hear water entering.
  3. Monitor the pressure gauge and close the taps once the needle reaches between 1.0 and 1.5 bar.

Parts commonly replaced

  • Filling loop valve
  • Pressure sensor
  • Expansion vessel
Full explanation for F.22
F.28

Your boiler has tried to light itself three times but failed, meaning your heating and hot water have stopped working.

High DIY-safe £100-350

What to check first

  1. Check if your gas meter has credit and the isolation valve is open.
  2. Ensure other gas appliances in your home, like a hob, are working correctly.
  3. Press the Reset button on the boiler control panel to clear the lockout.

Parts commonly replaced

  • Gas valve
  • Ignition electrodes
  • Spark generator
  • PCB
Full explanation for F.28
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