I found the furnace coding out on an error code 35–1. That is for modulating gas valve fault. Spoke with tech-support and they still do not have a solution for this. After some troubleshooting, I came to the conclusion that with the communicating thermostat, the furnace will code out 35-1. However, I installed a ecobee thermostat temporarily which has shown no issues with operation. Let the customer know that once we hear back from carrier, we will return to install the previously installed infinity communicating thermostat. As well as any additional fixes that carrier has for the modulating gas fault. Also completed startup for the air conditioner at this time, using a charging jacket. Followed the correct procedures using the charging jacket in lower than ideal ambient weather. Did not make any adjustments to refrigerant however, I would like to return once the weather has picked up to verify that the charge is correct on the system.