Alert Code 347 — Relay Y1 Failure

Was bedeutet 347 ?

This critical alert occurs when the Lennox communicating thermostat requests compressor demand (Y1) but the indoor unit control does not detect 24VAC between Y1 and C terminals. This suggests a Y1 relay failure on the system component.

• Y1 relay failure on system component
• Furnace pilot relay contacts did not close
• Relay coil did not energize

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1. 1

   The system operation will stop.

2. 2

   The alert automatically clears after a reset and Y1 input is sensed.

3. 3

   If the problem persists, contact a qualified Lennox installer or service technician.