Daikin Altherma

1
Daikin Altherma Troubling Shooting
2
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

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.

4
Freeze up problem

• Code
• Part Refrigerant liquid sensor
• LocationLiquid pipe hydrobox
• Activation failure Temperature liquid sensor too
  low.
• Possible action to resolve the problem
• Check refrigerant charge of the installation

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

6
Outlet water temperture too high

• Code 8H
• Part Outlet water thermistor
• Location Outlet back up heater
• Activation failure If outlet water gt 65C
• 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

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

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

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

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
  ( gt130C) 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

16
Overcurrent failure

• Code E8
• Part Compressor overcurrent
• Activation failure Failure, if current (gt30
  Amp) occurs 16 times. Counter reset if compressor
  runs normal for 5 minutes
• Location Outdoor unit
• Possible action to resolve the problem
• Compressor breakdown.
• Short-circuit
• Defective power transistor.
• Defective capacitor on inverter board.
• Defective outdoor PCB.

17
Cool / Heating switching failure

• Code EA
• Part four way valve
• Activation failure
• Cooling if (room temp liquid temperature) lt
  -10C
• Heating if (
• Location
• Possible action to resolve the problem

18
Sanitary water too high

• Code EC
• Part Sanitary tank temperature
• Activation failure If temperature sanitary water
  gt 89C
• 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 gt 120C 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.

20
Too high condensing pressure

• Code F6
• PartSensor outdoor heat exchanger
• Activation failure Failure if temperature heat
  exchanger gt 60C
• Possible action to resolve the problem
• Faulty outdoor fan
• Faulty EEV
• Dirty heat exchanger
• Faulty thermistor

21
Too high condensing pressure

• Code FA
• Part
• Activation failure
• Possible action to resolve the problem

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

23
Compressor start up failure

• Code H6
• Part Compressor / Outdoor PCB
• Activation failure Failure when compressor fails
  to start 8 times.
• Possible action to resolve the problem
• Compressor cable disconnected
• Compressor
• Outdoor PCB
• Supply voltage out of voltage specifications

24
CT failure

• Code H8
• Part Current transformer on outdoor PCB
• Activation failure Failure if compressor running
  freq lt 55Hz and CT input lt then 0.1V for 4 times
• Possible action to resolve the problem
• Power transistor defective
• Bad or poor electrical contact
• Reactor defective
• Outdoor PCB

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

28
Fin thermistor switchbox

• Code P4
• Part resitance located on the outdoor PCB
• Location
• Activation failure Resistance value out of range
• Possible action to resolve the problem
• Outdoor PCB

29
Electrical box temperature rise

• Code L3
• Part Radiation fin thermistor
• Location Outdoor PCB
• Activation failure failure if temperature gt 85C
  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 gt
  105C and compressor ON for 4 times
• Possible action to resolve the problem
• Defective outdoor fan
• Defective Fin thermistor
• Defective Outdoor PCB
• Heat conductive paste

31
Output overcurrent detection

• Code L5
• Part
• Location Outdoor PCB
• Activation failure failure if running current is
  gt then preset value
• Possible action to resolve the problem
• Defective power transistor
• Defective outdoor PCB
• Defective compressor
• Poor installation condition

32
Insufficient gas

• Code U0
• Part
• Location Outdoor
• Activation failure see next slide
• Possible action to resolve the problem
• Refrigerant shortage
• Poor performance of the compressor
• Defective electronic expansion valve

33
Insufficient gas
When discharge pipe temperature is 45C higher
than target value and the electronic expansion
value opening is 480 pulse (max.), the adjustment
is made for insufficient gas.
When an output frequency is exceeds 40 Hz and the
input current is less than specified value, the
adjustment is made for insufficient gas.
34
Low or High volttage detection

• Code U2
• Part DC detection circuit
• Location Outdoor PCB
• Activation failure Low / Over voltage. Failure
  when low or overvoltage occurs 16 times
• Possible action to resolve the problem
• Supply voltage not within the specifications
• Detection circuit defect
• PAM control defective

35
Signal transmission error on outdoor PCB

• Code U7
• Part CPU PM1
• Location Outdoor PCB
• Activation failure Failure when communication
  error between outdoor PCB and power module
• Possible action to resolve the problem
• Replace outdoor PCB

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Thank you for your attention!