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E205MEDIUM

Boiler NTC Sensor Failure (Lochinvar)

Lochinvar boiler temperature sensor has failed open or short circuit.

What This Error Code Means

The NTC temperature sensor circuit is providing an invalid reading to the control system.

Common Causes

  • Sensor wiring damaged
  • NTC sensor failed
  • Connector corrosion
  • Water damage to sensor
  • Control board input failure

Affected Brands

Lochinvar

How ROMA Heating Fixes This

  • Check sensor wiring and connections
  • Measure sensor resistance
  • Replace NTC sensor if out of range
  • Check control board for input signal
  • Verify temperature readings after replacement

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