I completed diagnostics and spoke to the customer and she stated tstat will not shut ac off once it reaches set point. I found that the contactor is not sticking. I found pressures that indicate the system is over charged. I explained to customers mom who sounded very confused about what’s going on. I explained there is nothing happing at this moment so issue must be intermittent. I offered to replaced tstat for $99 plus call fee and the customer approved. The system is operational in heating and cooling at departure.