Do you have layout for fuse and relays ?
If you can find the signal wire from LHC
To the coils then you can check for volts
If I remember right it will not be battery from volts
It will be around 5 volts or so from LHC to coils
You may be getting the correct signal but have a valve issue Linde is one of the units that will throw a code for any voltage interruption ie coil or wire issue.generally the wire goes from
LHC to a relay and fuse to the coil