Ideal Isar HE30 Fault codes & diagnostics

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

Combi Natural Gas 2003-2011 Discontinued
GC Number 47-348-30
Download the Ideal Isar HE30 manualThe official installation and service manual (PDF), the document these fault codes were read from. PDF

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All 4 documented codes

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H E

Your boiler has detected a communication conflict between its internal electronic control panels, meaning it cannot currently coordinate its functions safely.

High Engineer only £150-300

Parts commonly replaced

  • Control PCB
  • Wiring harness
H9

Your boiler is displaying a specific service or status code, which on the Ideal Isar usually indicates a temporary internal communication or sensor reading issue that may require a reset or professional check.

Medium Engineer only £100-£250

Parts commonly replaced

  • NTC Thermistor
  • Printed Circuit Board (PCB)

Related codes

H9/L9

Your boiler has detected that it is getting dangerously hot and has shut itself down to prevent any internal damage.

High Engineer only £150-350

Parts commonly replaced

  • Pump
  • Heat exchanger
  • Temperature sensor

Related codes

L9

Your Ideal boiler has detected an internal electronic or sensor glitch and has temporarily locked itself out for safety.

High Engineer only £150-300

Parts commonly replaced

  • Printed Circuit Board (PCB)
  • NTC Thermistor
  • Wiring harness

Related codes