1 system spring PM. Checked blower motor amps. Checked temperature differential. Air filter is clean. Evaporator is clean. Checked condensing unit. Checked refrigerant pressures. Checked electrical components. No issues found at this time. System is working as designed. Customer says nest thermostat has gone blank in the past. If it happens again customer will call us out so we can see whatâ€™s going on and replace thermostat if necessary.