MTC-IV HVac control

[captcrunch]

My salon ac control has always slightly had a mind of its own. Now it doesn’t want to let me lower temp and is only raising temp and blowing heat. Any suggestions on what to check or anyone have a spare controller to sell?

 

[Captain Ralph]

It is the operator panel.
Shop for a new one or send yours in for repair to Flight Systems.
While it's in the shop, use a panel from an un-used cabin.

 

[captcrunch]

Tried that and had same result with one from master

 

[finatic]

Reversing valve stuck maybe.....sometimes a wack with a hammer will "fix"

 

[captcrunch]

Where is the reversing valve located?

 

[finatic]

Where is the reversing valve located?

Good question! I witnessed a tech do it with a hammer but didn't pay much attention. I know it was in the compressor area and not near the evaporator. This was on an old Cruisair unit.