Amana PTH153B50AM PTAC where the heat runs intermittently.

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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yes it is fixable does the blower run? I would pull it out take it outside and wash with hose the outside coil and inside coil make sure you clean the outside coil real good on both sides. this may solve your problem.

This means there is a fault in relay section in PCB or might be loose connection in connector. Pls reconnect the connector again and tight that connector with cable tie and any tape then see , if it works then fine if not means problem in contractor. Just clean that

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.

EBay often has the control boards for Amana heat pumps, and installing them is fairly straightforward, provided you have some experience with electronics, a soldering iron, etc. Amanapartsonline.com may also be able to sell you the part, which should run between $50 and $150.

Given, however, that the thermostat is also showing problems, as well as what parts are going for these days, I'd seriously consider upgrading to a new unit and selling the old one on Craigslist to offset the cost a bit. If you can find an HVAC technician, someone who's learning HVAC, someone who just wants it for a guestroom where it need not work perfectly or a landlord who can afford to have a secondhand unit fixed and put it in one of their properties for their tenants to buy your fixable old one for a few hundred dollars and a new one only runs about $700, your upgrade will cost less than having the 7-year-old unit repaired, plus you'll be recycling.

Jane, what you really need is the Owners Manual for you discontinued model AC/Heat Pump.
Call Amana Customer Support 1-800-843-0304 and they can furnish you one. Either by email attachment or by snail mail.

Hope this helps you. Please let me know.

First unplug the unit......Take the front cover off, take the wire screen off where the front fan is there is 4 or 5 screws that hold the plate that was under the screen. The electric heating elements are under that plate between the evaporator coil and the front blower wheel. It will lift straight up and give you access to the elements. In the electric heating element area there is a limit switch with a red or black button in the center of it push it to reset the limit it is on the right hand side by the controls. I wish I could find a picture to show you but I couldn't find one. It is not easy to get to... Hope this helps.

there might be a reset button on the heat protector / you just might have a bad heat protector or the sensor on the board could be burnt out

Reset the unit to factory setting by take the master switch off of 10 sec.
Then press and hold the cool and heat button down while turning the master switch back on.