Well as you all know I installed a HP on my oil furnace. had some issues with tripping on a low p or so I thought was going out on Hp
duh! I put in a 2" pleated filter (cause I had one) and the unit ran up to 410 head DUH!
took it out and the head settled at 225
doh! Thanks guys I learned something here reg filters other wise I would still be out side scratching my butt!
You know I learned something resid is not quite so easy as it looks