Daikin E203

Alarm Logic	E203 If supply sensor is 3°C lower than set point for 3 minutes in chilled mode If supply sensor is 0.5°C lower than set point for 30 minutes in chilled mode
Possible Causes	Cooling load is reduced rapidly Faulty low pressure transducer (LPT) Faulty discharge gas temperature sensor (DCHS) Faulty suction modulation valve (SMV) Faulty discharge gas bypass solenoid valve (BSV) Fuse circuit disconnected (Fuse 2) Evaporator fan motor abnormality
Trouble Shooting	Replace LPT if pressure difference between pressure gauge and sensor reading is greater than 30kPa Check installation of DCHS Reset SMV opening if SMV opening is fixed at around 79pLs (24%) Check wiring and connector CN12 on I/O board for BSV if SMV opening is except 79pls Replace Fuse Fu2 if it is open Check evaporator fan motor magnetic contacts bave failed Check SMV wiring and connector CN9 on I/O board
Controller Action	E203 Restart after 3 minutes