I have a SideShot SS1 installed on a Weil-McClain oil burner. The setup is about 2 1/2 years old. About a year ago the SS1 would run for extended periods of time (1-2hours) before shutting down. About a month ago, it would not stop running. After a full 24 hours I called our oil service company. They tinkered with it and eventually wanted to replace the universal control circuit board. However, it suddenly started working fine so we left it. After a month, it's starting to run for hours at a time again.
We get some rain coming into the vent from the outside but they tell me not to worry about that.
Should I try replacing the UC1 board? Does rain hurt the SS1? There does not seem to be any water damage to the UC1. I was thinking the prover switch might be affected by the water. Should I try replacing this first?