8 Faults and malfunctions
Installation and maintenance instructions
47
Daikin Altherma EHS(X/H)(B)-D
Heat pump (indoor unit) with integrated heat accumulator
008.1444099_01 – 11/2018 – EN
Code Component/Designation Error Possible fault rectification
E9021 High-pressure switch S1PH
in the heat pump outdoor
unit
HPS system
▪ High-pressure switch S1PH defective.
▪ Main circuit board in the heat pump outdoor unit
defective.
▪ Wiring, poor contact.
▪ Check, replace.
E9022 Outside temperature sensor
R1T in the heat pump out-
door unit
AT sensor error Sensor or connecting cable defective.
▪ Check, replace.
E9023 Storage tank temperature
sensor t
DHW1
or t
DHW2
Hot water sensor error
E9024 Pressure sensor S1NPH in
the heat pump outdoor unit
Pressure sensor
E9025 Outlet temperature sensor
R2T in the heat pump out-
door unit
Return flow temperature sensor error
E9026 Intake temperature sensor
R3T in the heat pump out-
door unit
Intake pipe sensor error
E9027 Temperature sensor of fin
heat exchanger R5T in the
heat pump outdoor unit
Aircoil sensor, defrost
E9028 Temperature sensor of fin
heat exchanger R4T in the
heat pump outdoor unit
(only in 11-16kW system)
Aircoil sensor, temp
E9029 Fluid side temperature
sensor R6T in the heat
pump outdoor unit
AG cold sensor error
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