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Next step would be to check the charge and see if perhaps it is low on refrigerant.
The LP message is an indication of low refrigerant pressure
You will need a manifold gauge set to connect to the heat pump. Do you have these?
You are most likely going to have to pay a tech to charge the system as you need an epa certification to purchase refrigerant. The gauges are about a hundred bucks.
If you want to get the gauges and check charge I am happy to guide you, but as noted unless you have the certification, you would still need to pay a tech to come and repair leak then recharge.
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