What It Means
- Thermostat demand signal Y1 is present, but the compressor is not running. Heat pump only - Trip light will be on during defrost board 5 minute delay with Y thermostat call.
Lennox Split & Multi-Split
Lennox Error Code Red Trip
Split & Multi-Split:
Causes & actions from Lennox
How it shows
- lsom trip led: Red Trip (trip: on)
1 Compressor protector is open. 2 Outdoor unit power disconnect is open. 3 Compressor circuit breaker or fuse(s) is open. 4 Broken wire or connector is not making contact. 5 Low pressure switch open if present in the system. 6 Compressor contactor has failed to close.
Applicable models & manual sources
- HSXB15
Thermostat demand signal Y1 is present, but the com- pressor is not running. Heat pump only − Trip light will be on during defrost board 5 minute delay with Y thermostat call.
Disclaimer: This information is for general reference. Code wording and instructions vary by model. Always follow the service manual for your exact unit.
What should you check next?
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