What does HP5 mean on my heat pump? - Aquacal HEAT PUMP 120,000 BTU H135 -

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If it's a heat pump, it means you either bumped the heat up to a temp that the heat pump cannot reach quickly OR it's so cold out that there is no heat for the heat exchanger to pull from the air outside.
Both conditions turn on the heat strips in the air handler. The heat strips are your 'auxiliary heat.'

In defrosting mode, The LED displays “dF” or alternative displays between running frequency and “dF” (each displays 0.5s)
This means the outdoor unit is in defrost mode, heat pumps will initiate defrost upon demand. Its a normal operation code

If it is a heat pump if the ambient I door temp is not than 3 degree s lower than 66 it utilizes the aux heat ( heat strips) to help the unit achieve your desired temperature set point faster. Also the heat pump does need help if trying to overcome really cold temperatures. Once set point is achieved the heat pump should be able to keep the home at the set point without aux heat. But the flashing may just be to let you know that the heat strips are in use at the current time. See if when the temperature gets close to your set temp if it goes away. If not a heat pump it may always flash to just tell you heat strips are in use. Some homes mostly trailers only have heat strips but on heat pumps heat strips are there to help heat pump get to your desired temp. But when your heat pump can maintain the temp without the strips is where it saves power. Also heat pump thermostat hVe emergency heat settings. This scares alot of people but if your heat pump isn't working and you have to switch it to emergency heat until you can get it fixed,. That means that the system is only using heat strips and not utilizing heat pump at all. Power bill may be a little higher but remember, most trailer homes only have heat strips and if you do not use emergency heat in this situation your heat strips will only heat home 3 degrees below set point on thermostat to allow heat pump to bring it up the other 3 degrees. If heat pump isn't working correctly you will always be 3 degrees colder than what you set you thermostat at. Maybe too much info but it's prolly just your aux heat on helping system achieve the desired temp you set thermostat too.

There is a sticker on the back of the stove, it should have the manufacture date.

It means the power is off or went off to unit . Check for power then power cycle unit to try and restart .

Error FS?
Unit has started defrost cycle and will reverse operation in 5 minutes.
If coolant has nor res=ached desired temp, unit will shut down and display FS

Other models:
FS can mean not enough water flow in cooling mode.

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

Have you tried the Vista drivers from OKI? This link has the Vista drivers. Windows7 is an extension of Vista although this statement may generate a lot flack....

Economy Mode = EM
Auxelary Mode = AUX
in em mode heat pump does most of the work in aux either an electric heating element is used or gas depending on if it is gas or all electric