(4) AC Maintenance - 410A - PTAC - Upon arrival client showed me to living room system that is not cooling. Checked interior of unit, checked capacitor ok, checked incoming voltage, checked filter, noticed when compressor turns on circuit board goes into Standby, checked blower amps. Checked fan relays ok Checked fan motor voltage ok. Noticed after resetting Breaker System turns on, compressor kicks in runs for a few minutes then goes off on Error. Must contact Tech Support to properly diagnose circuit Board. Board goes off on Error when Compressor & Fan kicks in. Removed all covers for units, tested each condensation line with water multiple times, noticed living room system also had a blocked drain, blew out with nitrogen, cleaned all air filters, tested all capacitors ,checked delta T ok, noticed dining room unit(Right) has oil residue from compressor, checked temp split system is currently cooling but may lose pressure over time. Sprayed and cleaned exterior of all units, units are