Intermatic Timer issues

Hello, I am trying to troubleshoot a 19 year old control panel installed by Blue Haven pools in 2002. It has two relay switches on it. I rewired it from 2-speed to a single speed. I installed a new timer Intermatic PB913n66 and a new temperature sensor 178T24. I have to use the manual override to turn on the system, the timer will shut it off. Is the timer defective or is the control panel [an obsolete Ji500] at fault here. Is it time to replace the control panel?

Does anyone have a system similar to mine? If so, what have you done to understand this system? Do you know where I can download a manual for this box. I have no idea what manufacturer builds boxes for Blue Haven.