Worcester Bosch heat pumps

Real-world Worcester Bosch fault diagnostics

Diagnostic checklists from engineer-submitted Worcester Bosch faults, with step-by-step checks and safety notes.

• Greenstar →

  Frequent pressure drops on a Worcester Bosch Greenstar boiler typically indicate a leak within the sealed system, a faulty pressure relief…

• Greenstar Cdi →

  The Worcester Greenstar CDi is a condensing combination boiler.

• Greenstar 12i System — fault Heat exchanger overheat →

  The Worcester Greenstar 12i System displaying a "Heat exchanger overheat" fault code indicates the boiler's safety systems have activated…

• Greenstar 12i System — fault Ignition lockout →

  The Worcester Greenstar 12i System displaying an 'Ignition lockout' fault indicates that the boiler has attempted to ignite but failed to…

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