What It Means
- Coil Sensor Problem
Lennox Split & Multi-Split
Lennox Error Code Alternating FAST Flash
Split & Multi-Split:
Causes & actions from Lennox
How it shows
- defrost control ds2 ds1 led: Alternating FAST Flash (ds1: flashing (fast), ds2: flashing (fast))
- defrost control ds2 ds1 led: Alternating FAST Flash (ds1: flashing (fast), ds2: flashing (fast))
Coil Sensor Problem. Sensor being detected open or shorted or out of temperature range. Board will not perform demand or time/temperature defrost operation. (System will still heat or cool).
Other manual wording
EL16XP1, ML16XP1
Sensor being detected open or shorted or out of temperature range. Demand defrost control will not perform demand or time/temperature defrost operation. (System will still heat or cool.)
Applicable models & manual sources
- XP19
Coil Sensor Problem
- XP19
Coil Sensor Problem
- EL16XP1
Coil Sensor Problem
- ML16XP1
Coil Sensor Problem
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?
Continue in ACLogics with guided diagnosis for your equipment and symptoms.
