Ariston · A niche brand in the UK. 96 codes across 2 product families, each taken from the manufacturer’s manuals. Ariston technical support ↗
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96 codes
| Code | Meaning | Stops? | Homeowner check? |
|---|---|---|---|
| 2P2 | Thermal cleanse not complete - sanitisation temperature not reached in 6 h | No | Yes |
| 2P3 | DHW setpoint not reached in boost | No | Yes |
| 2P4 | Electric heater thermostat (manual reset) | Partly | Yes |
| 2P5 | Electric heater thermostat (automatic reset) | Partly | Yes |
| 2P7 | Precirculation error | Not stated | Yes |
| 2P8 | Low pressure warning | No | Yes |
| 2P9 | SG ready input configuration error | Not stated | Yes |
| 9E5 | High-pressure pressure switch intervention | Yes | Yes |
| 9E8 | Low-pressure pressure switch error with compressor OFF | Yes | Yes |
| 9E9 | Klixon error with compressor OFF | Yes | Yes |
| 9E18 | ST1 safety thermostat error | Yes | Yes |
| 9E21 | Low refrigerant charge error | Not stated | Yes |
| 9E22 | Machine empty error | Yes | Yes |
| 9E24 | EXV seized up error | Not stated | Yes |
| 9E28 | High pressure protection | Not stated | Yes |
| 9E29 | High pressure protection | Yes | Yes |
| 9E31 | Compressor thermostat protection | Not stated | Yes |
| 9E32 | Compressor thermostat protection | Yes | Yes |
| 9E34 | Low-pressure protection | Not stated | Yes |
| 9E35 | Low-pressure protection | Yes | Yes |
| 9E36 | Compressor phases current imbalance | Not stated | Yes |
| 9E37 | Compressor phases current imbalance | Yes | Yes |
| 9E38 | Excessively steep compressor current variation | Not stated | Yes |
| 9E39 | Excessively steep compressor current variation | Yes | Yes |
| 114 | Outside temperature not available - temperature control activation based on the external sensor | Partly | Yes |
| 730 | Buffer high probe error - buffer filling inhibited | Partly | Yes |
| 731 | Buffer overtemperature - buffer filling inhibited | Partly | Yes |
| 732 | Buffer low probe error - buffer filling inhibited | Partly | Yes |
| 902 | System flow sensor damaged | Not stated | Yes |
| 905 | HP compressor mismatch error | Not stated | Yes |
| 906 | HP fan mismatch error | Not stated | Yes |
| 907 | HP 4-way valve mismatch error | Not stated | Yes |
| 908 | Expansion valve mismatch error | Not stated | Yes |
| 909 | Fan off and heat pump on | Not stated | Yes |
| 910 | Inverter-TDM communication error | Yes | Yes |
| 912 | 4-way valve error | Yes | Yes |
| 913 | LWT sensor error | Yes | Yes |
| 914 | TR sensor error | Yes | Yes |
| 917 | Freeze error | Yes | Yes |
| 918 | Pump down error | Yes | Yes |
| 921 | Error electricity/gas cost ratio | Not stated | Yes |
| 922 | Freeze error | Not stated | Yes |
| 923 | Heating circuit pressure error | Yes | Yes |
| 924 | Communication error (TDM board - Energy Manager); 'HP communication error' in the user manual | Yes | Yes |
| 925 | Boiler not present | Not stated | Yes |
| 927 | AUX inputs correspondence error | Not stated | Yes |
| 928 | Energy supply shutdown configuration error (hybrid manual: 'External lockout configuration mismatch') | Not stated | Yes |
| 931 | Inverter error (see inverter sub-codes 1-28) | Yes | Yes |
| 931-1 | Inverter error sub-code 1: Inverter output current sensor error | Yes | Yes |
| 931-2 | Inverter error sub-code 2: DC bus capacitors pre-charge error | Yes | Yes |
| 931-3 | Inverter error sub-code 3: Inverter input voltage sensor error | Yes | Yes |
| 931-4 | Inverter error sub-code 4: Inverter heat sink temperature sensor error | Yes | Yes |
| 931-5 | Inverter error sub-code 5: DSP&MCU communication error | Yes | Yes |
| 931-6 | Inverter error sub-code 6: Inverter input AC overcurrent | Yes | Yes |
| 931-7 | Inverter error sub-code 7: Inverter PFC current sensor error | Yes | Yes |
| 931-8 | Inverter error sub-code 8: Inverter PFC temperature sensor error | Yes | Yes |
| 931-9 | Inverter error sub-code 9: Corrupt EPROM | Yes | Yes |
| 931-10 | Inverter error sub-code 10: PFC HW overcurrent | Yes | Yes |
| 931-11 | Inverter error sub-code 11: PFC SW overcurrent | Yes | Yes |
| 931-12 | Inverter error sub-code 12: Inverter PFC overvoltage | Yes | Yes |
| 931-13 | Inverter error sub-code 13: A/D error | Yes | Yes |
| 931-14 | Inverter error sub-code 14: Addressing error | Yes | Yes |
| 931-15 | Inverter error sub-code 15: Compressor inverse rotation | Yes | Yes |
| 931-16 | Inverter error sub-code 16: No current variation on compressor phase | Yes | Yes |
| 931-17 | Inverter error sub-code 17: Misalignment between real and calculated speed | Yes | Yes |
| 931-18 | Inverter error sub-code 18: Vaux inverter error | Yes | Yes |
| 931-19 | Inverter error sub-code 19: Vstep Inverter/Control Board error | Yes | Yes |
| 931-20 | Inverter error sub-code 20: Inrush circuit error | Yes | Yes |
| 931-21 | Inverter error sub-code 21: PFC inverter error | Yes | Yes |
| 931-22 | Inverter error sub-code 22: DC bus overcurrent | Yes | Yes |
| 931-23 | Inverter error sub-code 23: Inverter module error | Yes | Yes |
| 931-24 | Inverter error sub-code 24: Compressor loss of synchronism | Yes | Yes |
| 931-25 | Inverter error sub-code 25: PCB overheating | Yes | Yes |
| 931-26 | Inverter error sub-code 26: HW interruption | Yes | Yes |
| 931-27 | Inverter error sub-code 27: Absence of configuration | Yes | Yes |
| 931-28 | Inverter error sub-code 28: SW error | Yes | Yes |
| 933 | Flow sensor overtemperature | Not stated | Yes |
| 934 | DHW tank sensor damaged | Partly | Yes |
| 935 | Tank overtemperature | Partly | Yes |
| 936 | Floor thermostat 1 error | Partly | Yes |
| 937 | No circulation error | Not stated | Yes |
| 938 | Anode fault | Not stated | Yes |
| 940 | Hydraulic scheme not defined | Yes | Yes |
| 947 | 4-way valve error | Not stated | Yes |
| 950 | Compressor delivery sensor error | Yes | Yes |
| 951 | TD sensor error | Not stated | Yes |
| 955 | Water flow check error | Not stated | Yes |
| 956 | HP compressor model mismatch | Not stated | Yes |
| 957 | HP fan model mismatch | Not stated | Yes |
| 960 | HP EWT sensor error | Yes | Yes |
| 962 | Defrost energy | Yes | Yes |
| 968 | ATGBUS TDM-EM communication error | Yes | Yes |
| 970 | Aux. pump configuration mismatch | Not stated | Yes |
| 994 | Low refrigerant charge error | Not stated | Yes |
| 997 | Compressor overcurrent | Not stated | Yes |
| 998 | Compressor overcurrent | Yes | Yes |