Heat pumps · Error codes · Carrier
11Carrier · AquaSnap / AquaSnap Plus 30AWH (R410A inverter monobloc, 2010-2018 generations)
11 on a Carrier AquaSnap / AquaSnap Plus 30AWH: User interface setting mismatch
Short answer
On a Carrier heat pump, 11 means: User interface setting mismatch. The heat pump keeps running with some functions stopped. An engineer is needed to fix the cause.
Reviewed 23 September 2026 · 1 source
What it means
The manual says: User interface setting mismatch.
Likely causes:
- Configuration/communication fault.
Is it safe?
| Does the heat pump stop? | Partly |
|---|---|
| Engineer needed? | Yes |
The heat pump keeps running with some functions stopped.
What you can check
- Note the code/LED pattern and the model from the rating plate, then contact a heat pump/refrigeration engineer.
- Check the heat pump's breaker/isolator at the consumer unit is on.
What the engineer will check
- Check NUI/GMC wiring, parameters and board.
Who to ask for: refrigeration / heat pump engineer.
Certification: Electrical competence for work inside the unit.
What you might notice
Sources
- Carrier 30AW AquaSnap Plus Reversible Inverter - Installation, Operation and Maintenance Instructions (air/water cycle heat pump), Order No. L010130H42 01.2017 (supersedes 12.2015) ↗ · L010130H42 01.2017 · page 26 · Reviewed 23 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 23 September 2026