Lg s36aw

[spimps]

Have a high wall inverter to investigate (not working),looked through the full service manual but can't find reference to the signal wire pulse voltages to outdoor unit.
They should show fault code but would like this additional info if anyone can help.
T hanks
BG

[install monkey]

0-72v dc for the 1st 3 minutes of compressor on signal then alarms if not detected