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. Common codes concern water flow (error 356, flow below 10 l/min according to Atlantic) and the underfloor heating safety device (error 369, according to Atlantic). On an air-to-water heat pump 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 means, according to Atlantic, that the underfloor heating safety device fitted on the underfloor flow pipe has tripped; it resets with its button.
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 • Air-to-water heat pump with underfloor heating
Atlantic 369: underfloor heating safety tripped
According to Atlantic, error 369 means the underfloor heating safety device has tripped. It is a unit fitted by the installer on the flow pipe of the underfloor heating.
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.