Heat pumps · Error codes · Atlantic
444Atlantic
444 on an Atlantic heat pump: BX34 no function
Short answer
On an Atlantic heat pump, 444 means: BX34 no function. The heat pump keeps running. An engineer is needed to fix the cause.
Reviewed 23 September 2026 · 2 sources
What it means
The manual says: BX34 no function.
Likely causes:
- Short-circuit.
- Unplugged or disconnected sensor.
- Faulty sensor.
- Sensor input BX3x not configured or sensor fault (e.g. 2nd zone sensor with 2nd circuit kit).
Is it safe?
| Does the heat pump stop? | No |
|---|---|
| Severity | Warning |
| Engineer needed? | Yes |
The heat pump keeps running.
What you can check
- Note the error number/LED pattern shown and give it to your installer.
What the engineer will check
- Check the sensor's wiring.
- Replace the sensor.
Who to ask for: heat pump controls.
What you might notice
Sources
- Alféa Excellia A.I. Installation manual (U0611757_1876_EN_14) ↗ · U0611757_1876_EN_14 · page 76 · Reviewed 23 September 2026
- Alfea Extensa A.I. R32 Installation manual (U0671217_2114_EN_11) ↗ · U0671217_2114_EN_11 · page 70 · Reviewed 23 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 23 September 2026