Ge ptac zoneline AZ52H07DABM1 cannot find any literature on this unit. Fan speed is constant low speed (regardless of setting) Guest complaints on this room are piling up, and I need some literature to properly t-shoot this unit. I did see a reversing valve, so it must be a heat pump model, but the compressor will not run in that mode. Outdoor air temp is 55 degrees. Can you steer me in the right direction? BIG THANX IN ADVANCE. Tom in Okemos, Mi.

I did replace both boards on ptac and blower motot but have no heat but have a/c I did replace both boards on ptac and blower motot but have no heat but have a/c

(I know this is almost a year old, and you've probably fixed it by now, but...)I work on hotel ptac's a lot, I don't know how yours compares in common problems, but when the heat isn't working, first thing you do (well after unplugging it) is with an ohm meter check the resistance across the heater coil wires (assuming electric) if it's infinite, one of your thermocouplers has popped.(there's usually one re-settable, and one that would need to be replaced) check the resistance across each thermocoupler. reset the re-settable one, or replace the non-rs-settable one. If neither of those was the problem, check your selector knob. these (again, on the unit's I work on, maybe quite different from yours) tend to break open from people pushing on them to hard to turn the knob. to check it, (without getting all technical with the ohm meter) push lightly on it, and turn it to several different positions, back and forth, see if the 'function' you get changes. (these are double pole switches, and if one plate in the switch comes loose, it may not move when you turn the knob) so, if you get the wrong function(heat when off or cool, high fan speed when off or low, cool when off or hot, etc.) then it's the switch and that little board should be replaced. (I know this is almost a year old, and you've probably fixed it by now, but...)I work on hotel ptac's a lot, I don't know how yours compares in common problems, but when the heat isn't working, first thing you do (well after unplugging it) is with an ohm meter check the resistance across the heater coil wires (assuming electric) if it's infinite, one of your thermocouplers has popped.(there's usually one re-settable, and one that would need to be replaced) check the resistance across each thermocoupler. reset the re-settable one, or replace the non-rs-settable one. If neither of those was the problem, check your selector knob. these (again, on the unit's I work on, maybe quite different from yours) tend to break open from people pushing on them to hard to turn the knob. to check it, (without getting all technical with the ohm meter) push lightly on it, and turn it to several different positions, back and forth, see if the 'function' you get changes. (these are double pole switches, and if one plate in the switch comes loose, it may not move when you turn the knob) so, if you get the wrong function(heat when off or cool, high fan speed when off or low, cool when off or hot, etc.) then it's the switch and that little board should be replaced.