There are comercial timers that have "flashing" mode, just look at Omron timers. If you have more logic present in the panel, you are probably at price of material that justifies small PLC like AB µLogix 1000 for all your control functions. If just a small LED needs to flash, there are LEDs that have flasher circuits built in them. I presume based on your question that you are not electronic tech at all. For one it would be fairly simple to design electronic circuit that does all control functions with small micro controller integrated circuit. If you need someone to do that for you, just ask here with details and post contact info.