Upon my arrival I spoke to the customer about their concerns with error code P5 on the Mitsubishi cassette unit. Performing my diagnostics I found that the condensate pump has failed causing the drain pan to back up and trip the float switch. I disassembled the system today to verify access to the condensate pump and left it disassembled upon the customer's request so heat can clean the indoor coil. Customer did approve a repair while on site today and parts are on order.