I have a 34 year old Amana heat pump package unit that unbelievably is still in fairly good shape, but recently it started to ice up in the heat mode when it's cold outside. It cools fine, and actually heats fine until the condensor ices up. It only ices up in heat mode.
I had a local tech come out and look at it, he didn't do any tests but said it was the defrost timer, but as my unit is so old he didn't have an original type timer which he said was an E-15. It's a box about 2 inches square with a long wire or thin tube that runs to a bulb that is soldered to the left lower edge of the condensor tubes and covered in a thick green putty.
My questions: should I replace the E-15 with an original mechanical type (they are still available) or should I retrofit the newer replacement which is a circuit board type??
A mechanic type E-15 costs around $, an E-15 circuit board replacement costs around [COLOR="Red"]$[/COLOR. Will the circuit board do a better job than the original type??
There isn't enough room where the current E-15 sits for the circuit board but in the panel to the right of that is a fairly open area with just some wires running through it, I think the board could be mounted there.