Heat pumps · Error codes · Atlantic
212Atlantic
212 on an Atlantic heat pump: Internal comm failure
Short answer
On an Atlantic heat pump, 212 means: Internal comm failure. The heat pump stops until the fault clears or is reset. An engineer is needed to fix the cause.
Reviewed 23 September 2026 · 2 sources
What it means
The manual says: Internal comm failure.
Likely causes:
- Unplugged or disconnected sensor (as printed).
- Communication/connection fault between hydraulic unit and outdoor unit (or between boards), or incompatible combination.
Is it safe?
| Does the heat pump stop? | Yes |
|---|---|
| Severity | Fault — clears by itself when the condition goes |
| Engineer needed? | Yes |
The heat pump stops until the fault clears or is reset.
What you can check
- Check the heat pump isolator and consumer-unit breakers are on (do not open any casing).
- Note the error number/LED pattern shown and give it to your installer.
What the engineer will check
- Check the sensor's wiring.
Who to ask for: heat pump / electrical.
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