My Amana PTAC PTC153B00AM has no power at all. It is wall plugged, but no lights come on on the board. It was working fine and showed no signs of going bad. Can this be a blown fuse or transformer?

Question edited for a lot more clarity.

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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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Maybe something here will help you....

https://ptac4less.com/blog/troubleshoot-reset-amana-ptac/

Does the power light come on?
If yes, then you can do a reset as below:
There is a master switch on the bottom left of the control board. Slide that to 'off' position.
Then press the hot and cold switch/key together and then slide the master switch back to 'on'.
Please put your response/observation here if that does not work or there is power light as asked on top.
Thanks

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.

did you check the reset switch on the power cord

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

Dear Friend! Er means Powerwas lost or voltage is low.
Do you believe if volt meter shows correct volts, it's perfect? No, even loose contact of neutral,burnt wire, it shows correct volts in that point.
Simple way to check the power is alright or not, just remove the a/c plug and connect any other device like electric racer, table fan, blower or iron box which work same volts as a/c. If other devices work, your power is o.k Or check for loose contact in your electrical wiring. Thanks.

see if you can find a new board the power failure fried it

sound like a thermister problem, however this may also be a circuit board problem, the system is controled by the outdoor board, check to see if you have a blown inline fuse in the outdoor unit, it will be under a red case in one of the wires.