Hello all - hoping someone can give me some direction. I have a 5 year old Rheem Prestige 96V unit. I turned on the heat for the first time last night - everything worked fine and hot air was blowing until the house warmed up. Woke up this morning and the furnace wasn't working. Bumped up the thermostat and nothing. When I check the furnace - I could see when it tried kicking the heat on (lower case h) and then would eventually throw the error code of 45. Thanks in advance!