Our Raypak RP2100 (model P-R405B) heater started acting up today. The heater worked fine during the summer and was working when I turned it off a month ago. Today when I was checking the equipment I went to raise the water temp on the LCD panel and it wouldn't turn on. The LCD panel shows a water temp of 63 and the "OFF" symbol is on. When I press the Mode button nothing happens, it will not show pool or spa. I turned the power switch off and on and it still wouldn't turn on. For a brief moment the pool symbol went on and the temp setting started running up and down erratically and then it turned off. I'm thinking the circuit board is bad? We've had a lot of rain lately but when I checked the circuit board it didn't look wet, could moisture be causing the problem?