The air conditioner in question is a split system Daikin Inverter, vintage 2003 upon closer inspection. The store owner, Stanley, hands me the remote and I switch the unit on. We wait a few minutes and it still just blows air at room temperature. The settings on the remote say it should be cooling to 20 degrees. At the moment it’s working more like a heater!
At the back of the store we strip the cover off the unit and take a look. Might be leak around the service ports by the look of some oil stains on the concrete pad. Best to be sure.
CPS Refrigeration Vacuum Pump