I have thru-wall PTAC Amana PTH093B35AM unit. I

Question edited for a lot more clarity.

The new improved energy efficient versions.

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Probably this one. Talk to your installer.

https://www.amana-ptac.com/products/ptac/hec154j

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Question edited for clarity and toss in some CAPS.

You can get wired or wireless.

https://www.amana-ptac.com/products/ptac

Fitting

https://www.google.com/search?q=amana+ptac+connect+to+wall+thermostat

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I would assume that there was a recent Power Failure (PF) or that it may still have a power failure. Find the double pole breaker and turn it off and back on

check that the reversing valve is working and wired properly

I don't see this error code in the manual. I do see nP as an error code for Window Switch lockout. I just had this happen to me and they had me reset the control board.

Remove case, flick master switch to OFF for 10 seconds. Press Heat/Cool same time turn switch back on HOLD until off light comes on.

You should be fixed. Just had to do this for my unit. I was playing around with the settings and turned on the window switch option by accident.

you must read your instr. manual how to reset to default setting
go to www. fitness.manualsonline.com

God bless you

Hi,
If you reset the GFCI button and then when you go to turn it on the button pops again, then you have a short inside the units probably in the fan motor or the compressor..

heatman101

If this is the serial number, it is a 1993 model.
Shastalaker7
A/C, & Heating Contractor

Fixed in the middle of evaporator coil.

Press and hold up and down arrow at same time -press off twice to get into program mode (should read C1) -press heat button to scroll to C2 the use up arrow to scroll through options. You want to set it to read-out "On" then press off to set. This should be the continuous fan mode.