Interesting Heating Problem

[Gort]

Hi,

I have an interesting problem that no one seems to be able to figure out. I am hoping some one here has seen this problem or even heard of this problem before.

My automatic heat kicks on and off constantly, also when the heat is on manual the heat will blow hot and then cold constantly. I am getting all kinds of codes, which I clear, and then they reappear. Unfortunately I have not been able to pin point this problem down to anything specific. I appreciate any help.

thanks

Drew

[SKperformance]

expansion valve

vacum is low on the duct work