Daikin Altherma™ Troubling Shooting
Outlet thermistor failure
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Code: 81
Part: Outlet water
thermistor
Location:
Activation failure:
Possible action to resolve
the problem:
– Check connector
– Check resitance value
– Replace thermistor
R3T
2
Freeze up problem
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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
3
Flow failure
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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
5
Outlet water temperture too high
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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
6
Indoor PCB failure
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Code: A1
Part: Indoor PCB
Location: Switchbox
Activation failure:
Possible action to resolve the
problem:
– Replace PCB
7
Insufficient cooling or heating
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Code: A5
Part: Liquid sensor hydrobox
Location:
Possible action to resolve the
problem:
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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
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Procedure: refer to service
manual
R3T
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
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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
10
Heat exchanger thermistor failure
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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
11
Outdoor PCB failure
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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
12
Overload activation of compressor
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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:
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Refrigerant shortage.
Malfunction four way valve.
Outdoor PCB failure.
Electronic expansion valve
defective.
13
Compressor start up failure
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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
14
Fan motor failure
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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
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
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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:
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Refrigerant shortage.
Malfunction four way valve.
Defective discharge sensor.
Defective EEV driver.
19
Voltage and current sensor failure
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Code: H0
Part: Voltage / Current sensor
Activation failure:
No measurement of current during
compressor operation.
Possible action to resolve the
problem:
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Reactor disconnected
Compressor disconnection
Outdoor PCB failure
Compressor defective
22
Outdoor ambient thermistor
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Code: H9
Part: Thermistor
Location
Activation failure: Resistance
value out of range
Possible action to resolve the
problem:
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Check connector
Check resistance value
Replace thermistor.
Outdoor PCB
25
Discharge pipe thermistor
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Code: J3
Part: Discharge pipe thermistor
Location
Activation failure: Resistance
value out of range
Possible action to resolve the
problem:
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Check connector
Check resistance value
Replace thermistor.
Outdoor PCB
26
Outdoor heat exchanger
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Code: J6
Part: Thermistor
Location
Activation failure: Resistance
value out of range
Possible action to resolve the
problem:
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Check connector
Check resistance value
Replace thermistor.
Outdoor PCB
27
Electrical box temperature rise
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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:
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Defective outdoor fan
Defective Fin thermistor
Defective Outdoor PCB
Heat conductive paste
29
Radiation fin temperature rise
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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:
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Defective outdoor fan
Defective Fin thermistor
Defective Outdoor PCB
Heat conductive paste
30
Thank you for your attention!
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