My guy went on a call yesterday. the customer says it was not cooling.
asked customer to turn unit on and he immediatly saw frost on suction line.
He had customer shut unit off. He checked for leaks and found that the access valve on the suction was leaking. He checked the indoor filter and it was clean.
He asked the customer if the airflow in the house was OK and the customer responded by saying the she hears the indoor fan going, but there is no cool air.
After turning the system on again he proceeded to charge the unit, the pressures went nuts,
350 and 60. He shut outdoor unit down, went into house and found that the G wire was disconnected from the air Handler (no fan, no air flow).
He reconnected the G wire and found that he now had overcharged the unit.
He then reclaimed the refrigerant he added and had to start charging unit over again.
What was Learned.
NEVER TAKE A CUSTOMER'S WORD FOR ANYTHING.
Check things out for yourself.
THERE CAN BE MORE THAN ONE PROBLEM WITH A SYSTEM.
A 20 minute service call shouldn't take 2 hours...