369 • Atlantic • Air-to-water heat pump with underfloor heating
Atlantic 369: underfloor heating safety tripped
Proof status : Manufacturer reference listed — check model coverage
Source: Atlantic — FAQ on error 369 (French, updated 03/03/2023) · Last verified 22 October 2026
Founder, AskMarcel.app
Founder of AskMarcel.app. Sheets are written from manufacturer documentation; the reference is shown when it has been verified.
In brief
Error 369 on an Atlantic heat pump means the underfloor heating safety device has tripped. Fitted by the installer on the underfloor flow pipe, it resets with its button. If the fault stays or returns, Atlantic refers you to an engineer or an approved service centre.
According to Atlantic's FAQ (updated 03/03/2023), error 369 means the underfloor heating safety device has tripped.
Continue this diagnosis in Marcel
Atlantic code 369: Marcel picks this code up for Air-to-water heat pump with underfloor heating and guides you, with the manufacturer reference when one exists.
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What does fault code 369 on Atlantic mean?
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.
The underfloor heating safety device has tripped. Atlantic's FAQ does not say what triggers it.
Differences between product ranges
| Range | Meaning | Exclusion |
|---|---|---|
| Atlantic air-to-water heat pump with underfloor heating | Underfloor heating safety device tripped | — |
Symptoms
- Error 369 shown on the heat pump
Safety notice
Ask Marcel recommendation (not in Atlantic's FAQ): do not bypass the underfloor safety device to restart the heat pump.
Diagnosis
1. Reset the underfloor safety device (Atlantic procedure)
- Locate the safety device fitted on the underfloor heating flow pipe.
- Press its reset button.
2. If the fault persists or returns
- Contact the installer or an Atlantic-approved service engineer.
How to reset fault code 369 on Atlantic?
Press the reset button of the underfloor heating safety device, fitted on the underfloor flow pipe.
Repair and return to service — Atlantic fault 369
If the fault returns after a reset, the engineer looks for the cause of the trip; Atlantic's FAQ does not name it.
When should you call an F-Gas engineer?
If the fault is still present after the reset, or if it comes back later (Atlantic FAQ).
Field context
Error 369 assumes underfloor heating with a safety device on the flow pipe. Without underfloor heating, check the model's manual.
Technical source data
Atlantic links 369 to the underfloor heating safety device. First step: reset it. If it returns, it is a repair job; the FAQ names no cause.
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Exact match
369 — Atlantic
Air-to-water heat pump with underfloor heating
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.
Source : Atlantic — FAQ on error 369 (French, updated 03/03/2023)
Frequently asked questions
What does error 369 mean on an Atlantic heat pump?
According to Atlantic, the underfloor heating safety device has tripped.
Is error 369 a refrigerant pressure fault?
No. Atlantic's FAQ links error 369 to the underfloor heating safety device, not to refrigerant pressure.
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