I am trying to toubleshoot a whole house generator system I installed last spring and am kinda at a deadend so I am trying to summon the wisdom here to figure out whats wrong.
The system consists of a 16 kw natural gas Generac with a Guardian 16 space ATS. All material was provided by the customer that also happens to be a real good customer of mine. The customer wanted the generator out by his detached garage so I piped the conductors and control wires out about 100' from his home. I used #4 conductors to account for any voltage drop and 18/4 for the control wiring. After reading later on this forum I regret using the 18/4 and had actually planned on repulling everything this spring at my expense.
The system was functioning fine all summer. However, now when you pull the poco main the units fires as required. I am getting 240 volts at the generator side of the transfer switch but the switch will not automatically transfer power. I can manually transfer and everything works fine. When I close the main the switch works and the unit shuts down after running the required cool down time.
I was there last week and I checked all connections, fusing and trouble lights and everything appeared fine. I was suspect of the control wiring so yesterday I ran #10 thhn from the switch to the unit for the 2 240 volt control wires. This made no difference in the performance of the system.
I have little experience with controls and would appreciate any advice anyone would care to offer as where to look from here. I am suspect of the upper solenoid but I am alittle uncomfortable bench testing it. I have attempted to includ a picture to facilitate any discussion that might occur.