Arrived on site per customer request to run a KCM inspection on their electric furnace. Furnace is a carrier electric and is about 15 years old. The filter is a 20x20x1 located to the right of the furnace, on the intake air side. Removed existing filter and with a new one. Customer also wanted me to look into a potential issue with their Nest thermostat giving them error codes. Gave the unit a call for heat and inspected the furnace. Took amp reading from the blower motor and got a reading of 2.64 A. Took amp reading on all strip heats and read about 20.3 A on all strips. Measured my Temperature differential and got about 30 degrees. Based on these readings, was unable to determine the cause of the error codes. Presented pricing for furnace diagnostic with and without membership pricing. Customer declined membership pricing but agreed to diagnostic. Removed nest thermostat from wall and inspected for any loose wiring. All wires were secure. Reset thermostat on wall and gave unit