2 Q:
Question 1:
Servicing Carrier Heat Pump 25HNA624 0030020.
Infinity thermostat displayed system "malfunction" needs service.
Trouble Codes: (all specific to 25HNA6) 75, 76, 77, 78 -- all related to "start voltage not achieved"
Not all together. Typically showing 75, 76 one day and 77, 78...