Daikin Altherma Troubling Shooting Outlet thermistor failure Code

Daikin Altherma™ Troubling Shooting

Outlet thermistor failure • • • Code: 81 Part: Outlet water thermistor Location: Activation failure: Possible action to resolve the problem: – Check connector – Check resitance value – Replace thermistor R 3 T 2

Freeze up problem • • • Code: 89 Part: Heat exchanger freez-up Activation failure: Outlet water temp. too low Location: Possible action to resolve the problem: – Check water flow in the system. Minimum water flow system 9 liter / min. R 3 T 3

Flow failure • • • Code: 7 H Part: Flow failure Location: Activation failure: Flow switch open during operation (no signal) Possible action to resolve the problem: – Check water flow in the system. (Minimum water flow system 20 liter / min. ) – Check water pressure in the installation. (Minimum 0. 3 bar) – Check shutt OFF valves – Is water system purged – Check pressure drop and speed of the waterpump – Check pump operation R 3 T 5

Outlet water temperture too high • • • Code: 8 H Part: Outlet water thermistor Location: Outlet back up heater Activation failure: If outlet water > 65°C Possible action to resolve the problem: – Check if contactor(s) back up heater is not welded – Check if thermistor is not damaged – Check if correct resistor value of thermistor • Procedure : Refer to service manual R 3 T 6

Indoor PCB failure • • • Code: A 1 Part: Indoor PCB Location: Switchbox Activation failure: Possible action to resolve the problem: – Replace PCB 7

Insufficient cooling or heating • • Code: A 5 Part: Liquid sensor hydrobox Location: Possible action to resolve the problem: – Check water flow in the system. (Minimum water flow system 9 liter / min. ) – Check water pressure in the installation. (Minimum 0. 3 bar) – Check shutt OFF valves – Is water system purged – Check pressure drop and speed of the waterpump – Check refrigerant charge – Check thermistor • Procedure: refer to service manual R 3 T 8

Booster heater thermal protector • Code: AA • Part: Thermal protector booster heater or back up heater * • Location: • Possible action to resolve the problem: – Check if thermal protection is not damaged. – Check contactor of the electric BUH / BSH 9

Stucked flow switch • • • Code: CO Part: Flow switch failure Activation failure: Flow swith remains closed when pump is not operating Location: Possible action to resolve the problem: – Check for dirt in flow switch – Replace part is required R 3 T 10

Heat exchanger thermistor failure • • • Code: C 4 Part: Liquid sensor Activation failure: Sensor broken or out of range Location: Possible action to resolve the problem: – Check connector – Check resistance of the sensor – Procedure: refer to servicemanual for procedure – If damaged replace part R 3 T 11

Outdoor PCB failure • • • Code: E 1 Part: Outdoor PCB failure Activation failure: Location: Possible action to resolve the problem: – Out of control of CPU • Voltage drop • Power loss • Noise on power supply – Defect outdoor PCB 12

Overload activation of compressor • • • Code: E 5 Part: Overload protector compressor Activation failure: Failure If overload protector ( >130°C) is activated twice in one hour Location: Outdoor unit Possible action to resolve the problem: – – Refrigerant shortage. Malfunction four way valve. Outdoor PCB failure. Electronic expansion valve defective. 13

Compressor start up failure • • • Code: E 6 Part: Compressor locked Activation failure: : Failure, if error occurs 16 times, counter reset if compressor runs normal for 5 minutes Location: Outdoor unit Possible action to resolve the problem: – Replace outdoor PCB – Replace compressor 14

Fan motor failure • • • Code: E 7 Part: Outdoor fan motor Activation failure: Failure, if error occurs 16 times, counter reset if compressor runs normal for 5 minutes Location: Outdoor unit Possible action to resolve the problem: – Fan motor breakdown – Bad contact between PCB and fan motor – Blockage of the fan blades 15

Sanitary water too high • Code: EC • Part: Sanitary tank temperature • Activation failure: If temperature sanitary water > 89°C • Location: Sensor inside sanitary tank • Possible action to resolve the problem: – Check position of sensor in socket – Check if contactor(s) booster heater is not welded – Check if thermistor is not damaged – Check if correct resistor value of thermistor 18

Discharge temperature too high • • • Code: F 3 Part: Discharge sensor Activation failure: Failure if discharge temperature > 120°C for 6 times Location: Sensor located on the discharge pipe of compressor Possible action to resolve the problem: – – Refrigerant shortage. Malfunction four way valve. Defective discharge sensor. Defective EEV driver. 19

Voltage and current sensor failure • • Code: H 0 Part: Voltage / Current sensor Activation failure: No measurement of current during compressor operation. Possible action to resolve the problem: – – Reactor disconnected Compressor disconnection Outdoor PCB failure Compressor defective 22

Outdoor ambient thermistor • • • Code: H 9 Part: Thermistor Location Activation failure: Resistance value out of range Possible action to resolve the problem: – – Check connector Check resistance value Replace thermistor. Outdoor PCB 25

Discharge pipe thermistor • • • Code: J 3 Part: Discharge pipe thermistor Location Activation failure: Resistance value out of range Possible action to resolve the problem: – – Check connector Check resistance value Replace thermistor. Outdoor PCB 26

Outdoor heat exchanger • • • Code: J 6 Part: Thermistor Location Activation failure: Resistance value out of range Possible action to resolve the problem: – – Check connector Check resistance value Replace thermistor. Outdoor PCB 27

Electrical box temperature rise • • • Code: L 3 Part: Radiation fin thermistor Location: Outdoor PCB Activation failure: failure if temperature > 85°C and compressor OFF Possible action to resolve the problem: – – Defective outdoor fan Defective Fin thermistor Defective Outdoor PCB Heat conductive paste 29

Radiation fin temperature rise • • • Code: L 4 Part: Radiation fin temperature rise Location: Outdoor PCB Activation failure: failure if temperature > 105°C and compressor ON for 4 times Possible action to resolve the problem: – – Defective outdoor fan Defective Fin thermistor Defective Outdoor PCB Heat conductive paste 30

Thank you for your attention! 36