Knowledge base
Atlantic fault codes
Alféa • Extensa
Complete guide to Atlantic heat pump and Alféa faults: air-to-water PAC, wall AC and gas boilers. Error codes 356, 369, 370, communication faults and manufacturer-backed procedures for certified installers.
Common Atlantic issues
Atlantic Alféa heat-pump faults
Atlantic Alféa and Excellia heat pumps show numeric codes on the interface or Cozytouch app. The most common field faults concern water flow (error 356, flow below 10 l/min according to Atlantic) and refrigerant circuit pressure (error 369, gas sensor). On an air-to-water PAC in heating mode, code 356 signals, according to Atlantic, insufficient water flow: the installer checks valves, settings, flow meter wiring, circulation and bleeding of the circuit. Error 369 points to the high/low pressure sensor or a refrigerant leak.
Atlantic air-conditioning faults
On Atlantic split and multi-split systems, indoor display codes often relate to sensors, fans or communication with the outdoor unit. Use the hub sheets to separate a simple dirty-filter trip from a genuine PCB or sensor failure, and follow the sourced diagnostic sequence before ordering spare parts.
When to call a certified engineer
Any intervention on the refrigerant circuit requires an F-Gas / certified refrigeration engineer. Electrical and hydraulic checks (filters, valves, flow meters, bus wiring) can be done by a qualified installer; if the fault returns after those checks, escalate with the AskMarcel procedure for the specific code.
Atlantic fault codes by product family
A code can mean different things depending on the range: open the sheet for the exact model.
356 • Air-to-water heat pump
Fault Code 356 Atlantic: insufficient water flow
According to the Atlantic FAQ, code 356 means the heat pump's water flow is below 10 litres per minute: the flow is insufficient.
369 • Alféa
Fault Code 369 Atlantic: Circuit Pressure — Resolution
Fault code 369 indicates an anomaly in the refrigerant pressure reading by the electronic control board.
01 • Takao / Zenkeo (Mural)
Fault Code 01 Atlantic Air Conditioning: Communication Problem (Serial Link)
On Atlantic wall-mounted air conditioners (Fujitsu-based), fault code 01 (often indicated by flashing: 1 Timer flash) indicates a break in the serial link.