Daikin Altherma™ Troubling Shooting

2

• Code: 81

• Part: Outlet water thermistor

• Location:

• Activation failure:

• Possible action to resolve the problem:

– Check connector– Check resitance value– Replace thermistor

Outlet thermistor failure

R3T

3

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 9liter / min.

R3T

5

Flow failure

• Code: 7H• 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 20liter / 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

R3T

6

Outlet water temperture too high

• Code: 8H

• 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

R3T

7

Indoor PCB failure

• Code: A1

• Part: Indoor PCB

• Location: Switchbox

• Activation failure:

• Possible action to resolve the problem:

– Replace PCB

8

Insufficient cooling or heating

• Code: A5• Part: Liquid sensor hydrobox• Location: • Possible action to resolve the problem:

– Check water flow in the system. (Minimum water flow system

9liter / 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 R3T

9

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

10

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

R3T

11

Heat exchanger thermistor failure

• Code: C4

• 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

R3T

12

Outdoor PCB failure

• Code: E1

• 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

13

Overload activation of compressor

• Code: E5

• 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.

14

Compressor start up failure

• Code: E6

• 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

15

Fan motor failure

• Code: E7

• 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

18

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

19

Discharge temperature too high

• Code: F3

• 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.

22

Voltage and current sensor failure

• Code: H0

• 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

25

Outdoor ambient thermistor

• Code: H9

• 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

26

Discharge pipe thermistor

• Code: J3

• 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

27

Outdoor heat exchanger

• Code: J6

• 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

29

Electrical box temperature rise

• Code: L3

• 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

30

Radiation fin temperature rise

• Code: L4

• 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

36

Thank you for your attention!