Daikin
The Daikin Altherma 3 M (EBLA/EDLA) is a monobloc air-source heat pump with capacities from 9 to 16 kW, using R32 refrigerant, and capable of a 60°C max flow temperature.
The Daikin Altherma 3 M (EBLA/EDLA) is a monobloc air-source heat pump designed for domestic heating and cooling in the UK. This range utilises R32 refrigerant and offers models with heating capacities from 9 kW to 16 kW. It is engineered to operate effectively in low ambient temperatures, down to -25°C, providing a maximum flow temperature of 60°C. This page provides technical specifications, fault codes, and installation guidance for heating engineers and homeowners researching this appliance.
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Full technical specifications extracted from the manufacturer brochure. Empty sections are hidden.
The Daikin Altherma 3 M (EBLA/EDLA) series comprises monobloc air-source heat pumps, featuring an inverter-driven compressor and R32 refrigerant. Available in heating-only (EDLA) and reversible heating/cooling (EBLA) variants, models range from 9 kW to 16 kW. The units are capable of delivering a maximum flow temperature of 60°C and maintain operation down to an outdoor ambient temperature of -25°C. Water circuit specifications include a maximum operating pressure of 4 bar, a minimum of 1 bar, and a minimum water flow rate of 28 litres per minute. The outdoor unit weighs 150 kg and includes an automatic reverse-cycle defrost function. Quiet mode is available, contributing to reduced sound emissions. Compatible controls include various thermostats and a multi-zoning base unit, with smart grid readiness and weather compensation also supported. The Daikin Residential Controller app provides remote management capabilities.
Every fault code listed in the manufacturer brochure, with likely causes and engineer actions. Each code has a permalink — paste a URL like https://www.boilertag.com/heat-pumps/daikin/altherma-3-m-ebla-edla#fault-7h-01 to jump straight to the entry.
| Code | Meaning | Details |
|---|---|---|
| 7H-01 | Water flow problem | — |
| 7H-04 | Water flow problem during domestic hot water production | — |
| 7H-05 | Water flow problem during heating/sampling | — |
| 7H-06 | Water flow problem during cooling/defrost | — |
| 80-01 | Returning water temperature sensor problem | — |
| 81-00 | Leaving water temperature sensor problem | — |
| 81-01 | Mixed water thermistor abnormality. | — |
| 81-06 | Entering water temperature thermistor abnormality (indoor unit) | — |
| 89-01 | Heat exchanger frozen (during defrost) | — |
| 89-02 | Heat exchanger frozen (not during defrost) | — |
| 89-03 | Heat exchanger frozen (during defrost) | — |
| 89-05 | Water Heat Exchange Freezing Abnormality during cooling (confirmed) | — |
| 89-06 | Water Heat Exchange Freezing Abnormality during cooling (during counting) | — |
| 8F-00 | Abnormal increase outlet water temperature (DHW) | — |
| 8H-00 | Abnormal increase outlet water temperature | — |
| 8H-01 | Overheating mixed water circuit | — |
| 8H-02 | Overheating mixed water circuit (thermostat) | — |
| 8H-03 | Overheating water circuit (thermostat) | — |
| A1-00 | Zero cross detection problem | — |
| A5-00 | OU: High pressure peak cut / freeze protection problem | — |
| AA-01 | Backup heater overheated | — |
| AC-00 | Booster heater overheated | — |
| AH-00 | Tank disinfection function not completed correctly | — |
| AJ-03 | Too long DHW heat-up time required | — |
| C0-00 | Flow sensor malfunction | — |
| C4-00 | Heat exchanger temperature sensor problem | — |
| C5-00 | Heat exchanger thermistor abnormality | — |
| CJ-02 | Room temperature sensor problem | — |
| E1-00 | OU: PCB defect | — |
| E2-00 | Leakage current detection error | — |
| E3-00 | OU: Actuation of high pressure switch (HPS) | — |
| E3-24 | High pressure switch abnormality | — |
| E4-00 | Abnormal suction pressure | — |
| E5-00 | OU: Overheat of inverter compressor motor | — |
| E6-00 | OU: Compressor startup defect | — |
| E7-00 | OU: Malfunction of outdoor unit fan motor | — |
| E8-00 | OU: Power input overvoltage | — |
| E9-00 | Malfunction of electronic expansion valve | — |
| EA-00 | OU: Cool/heat switchover problem | — |
| EC-00 | Abnormal increase tank temperature | — |
| EC-04 | Tank preheating | — |
| F3-00 | OU: Malfunction of discharge pipe temperature | — |
| F6-00 | OU: Abnormal high pressure in cooling | — |
| FA-00 | OU: Abnormal high pressure, actuation of HPS | — |
| H0-00 | OU: Voltage/current sensor problem | — |
| H1-00 | External temperature sensor problem | — |
| H3-00 | OU: Malfunction of high pressure switch (HPS) | — |
| H4-00 | Malfunction of low pressure switch | — |
| H5-00 | Malfunction of compressor overload protection | — |
| H6-00 | OU: Malfunction of position detection sensor | — |
| H8-00 | OU: Malfunction of compressor input (CT) system | — |
| H9-00 | OU: Malfunction of outdoor air thermistor | — |
| HC-00 | Tank temperature sensor problem | — |
| HC-01 | Second tank temperature sensor problem | — |
| HJ-10 | Water pressure sensor abnormality | — |
| J3-00 | OU: Malfunction of discharge pipe thermistor | — |
| J3-10 | Compressor port thermistor abnormality | — |
| J5-00 | Malfunction of suction pipe thermistor | — |
| J6-00 | OU: Malfunction of heat exchanger thermistor | — |
| J6-07 | OU: Malfunction of heat exchanger thermistor | — |
| J6-32 | Leaving water temperature thermistor Abnormality (outdoor unit) | — |
| J6-33 | Sensor communication error | — |
| J8-00 | Malfunction of refrigerant liquid thermistor | — |
| JA-00 | OU: Malfunction of high pressure sensor | — |
| JC-00 | Low pressure sensor abnormality | — |
| JC-01 | Evaporator pressure abnormality | — |
| L1-00 | Malfunction of INV PCB | — |
| L3-00 | Electrical box temperature rise problem | — |
| L4-00 | OU: Malfunction of inverter radiating fin temperature rise | — |
| L5-00 | OU: Inverter instantaneous overcurrent (DC) | — |
| L8-00 | Malfunction triggered by a thermal protection in the inverter PCB | — |
| L9-00 | Prevention of compressor lock | — |
| LC-00 | Malfunction in communication system of outdoor unit | — |
| P1-00 | Open-phase power supply imbalance | — |
| P3-00 | Abnormal direct current | — |
| P4-00 | OU: Malfunction of radiating fin temperature sensor | — |
| PJ-00 | Capacity setting mismatch | — |
| U0-00 | OU: Shortage of refrigerant | — |
| U1-00 | Malfunction by reverse phase/open-phase | — |
| U2-00 | OU: Defect of power supply voltage | — |
| U3-00 | Underfloor heating screed dryout function not completed correctly | — |
| U4-00 | Indoor/outdoor unit communication problem | — |
| U5-00 | User interface communication problem | — |
| U7-00 | OU: Transmission malfunction between main CPU-INV CPU | — |
| U8-01 | Connection with LAN adapter lost | — |
| U8-02 | Connection with room thermostat lost | — |
| U8-03 | No connection with room thermostat | — |
| U8-04 | Unknown USB device | — |
| U8-05 | File malfunction | — |
| U8-07 | P1P2 communication error | — |
| U8-11 | Connection with the Wireless gateway lost | — |
| UA-00 | Indoor unit, outdoor unit matching problem | — |
| UA-16 | Extension/hydro communication problem | — |
| UA-17 | Tank type problem | — |
| UA-21 | Extension/hydro mismatch problem | — |
| UF-00 | Reversed piping or bad communication wiring detection | — |
Patterns that group across the manufacturer's fault-code table. Each entry links to the full code listing further down the page.
Triggered by fault code 7H-01.
Triggered by fault code 7H-04.
Triggered by fault code 7H-05.
Triggered by fault code 7H-06.
Triggered by fault code 80-01.
Common questions from engineers and homeowners about the Daikin Altherma 3 M.
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Specifications on this page are extracted from the manufacturer brochure. Always cross-check against the latest datasheet before commissioning or quoting. Last updated 28 June 2026.