Lennox A98USMV Installation Instructions Manual page 64

Code Diagnostic Codes / Status of Equipment
E407 LSOM - Compressor open run circuit.
E408 LSOM - Compressor contactor is welded.
E409 LSOM - Compressor low voltage.
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Action Required to Clear and Recover
Required amount of current is not passing through
Run current transformer. Clears the error after current
is sensed in RUN sensor, or 1 normal compressor run
cycle, or after power reset.
Compressor runs continuously. Clears the error after 1
normal compressor run cycle or after power reset.
Secondary voltage is below 18VAC. After 10 minutes,
operation is discontinued. Clears the code after voltage
is higher than 20VAC for 2 seconds or after power
reset.
Issue 2346 508364-01