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Sounds like a thermostat issue rather than an issue with the heat pump if raising and lowering numbers makes it work.
If thermostat has batteries, start by replacing batteries. If you want to do some troubleshooting. Remove thermostat wires and touch the red to G and see if blower runs. Then red to Y and see if compressor comes on.If they do, then issue is in thermostat.Let me know model and I will see if there is any calibration or reset for the thermostat.