I am purchasing a new home that has a Heil heat pump unit (International Comfort Products Corp).
Inside Unit Model #: EF16J2200A2
Inside Unit Serial #: L0208 57612
Outside Unit Model #: HHP036AKA1
Outside Unit Serial #: L0207 96634
During the inspection phase, I had the unit inspected by a local HVAC company because I had concerns with the outside unit being frosted over during the entire 6 hour home inspection (it was about 30 degrees outside and the unit is on the East side of the house). The HVAC tech determined that the defrost board was shot and needed replaced. He tested the reversing valve by placing the system in AC mode and feeling the line set. The seller paid for the defrost board replacement and the HVAC tech said that defrost was now working. I went to check on the unit myself this morning (28 degrees with an overnight low of 26) and the unit was completely frosted. I have had heat pumps before (a 15 year old Bryant HP - replaced 2 years ago with a Gooodman HP) and did quite a bit of research on how heat pumps work, etc, so I understand about some frosting and that different units will have different amounts of frost build up. However, my gut just tells me that something isn't quite right. Both of my previous HP units never get more than a very thin coating of frost. Nothing even close to what I see on the Heil unit. Any thoughts on Heil and frost build up? I have attached pictures of the outside unit as it was this morning (hopefully they show up).