No user manual..?..Then GET ONE!!!.How the hell are you supposed to safeguard your equipment ,without the understanding of a basic system.... The YELLOW LED is the fault line indicator. The panel is WARNING you theres a fault with the monitoring devices linked to this panel. Hydrosense probes? Hydrowire continuous cables? Faulty two core leader cables Other WIRED monitoring devices. The installation manual will help yo with troubleshooting each zone.Or get someone in.
no name, January 2012