I recently aquired a Syncrowave 350 LX. Finishing rigging it and turned it on. about a minute after it's on the cooling fans run about a minute or so after that the HL.P 5 message appears. Looked up HL.P 5 and it's a rectifier overheat. I can't figure out why the unit would over heat just turned on. haven't welded yet or put the machine under a load. I cleaned the dust off of everything so there is sufficient air flow. Has anyone had this issue before or can anyone point me in the right direction?