The current weather is certainly not ideal for the solar to be contributing much. Add to that the major heat loss for almost 12 of the 24 hours due to low temperature.
It is unclear whether you know if the heat pump is running.
It will depend upon what temp the heat pump is set for.
If it is 80 and the pool is at 70 something, the heat pump should be running. You can certainly tell if it is running by just listening to it.
If it is running and set at 80 and pool below 80 the heat pump will run continuously.
If the heat pump is not raising the pool temp at least a very few degrees and it is still running, then it is not working.
Make sure in these cold temp nights forecasted to be near freezing that your solar control is in freeze protection mode.
Hopefully some of the above is helpful.
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