I have a Sweetwater Bahia that was winterized and not used for two seasons. I refilled last night and restored power to the unit. All electrical items, pumps, lights, display are working okay and the display flashes between FL1 and 63 (water temp). When I first powered the unit up I was getting a buzzing noise from circulation pump but it appears to be curculating fine now. Is there a erset for heater?

FL1 indicates a flow error while the pump is running, what this means is that either the pump is not pushing any water or you have some kind of restriction in the lines. What you need to do is remove the filter and then make sure you prime the system properly to get rid of any possible air pockets. Then cut the power and restart the system, if the FL1 still appears and the circulation pump is running then it may just be a bad pressure switch that needs to be replaced.