Heat pumps · Error codes · Carrier
8Carrier · AquaSnap / AquaSnap Plus 30AWH (R410A inverter monobloc, 2010-2018 generations)
8 on a Carrier AquaSnap / AquaSnap Plus 30AWH: Unit capacity mismatch
Short answer
On a Carrier heat pump, 8 means: Unit capacity mismatch. The heat pump stops until the fault clears or is reset. An engineer is needed to fix the cause.
Reviewed 23 September 2026 · 1 source
What it means
The manual says: Unit capacity mismatch.
Likely causes:
- Capacity setting mismatch between boards/controller.
Is it safe?
| Does the heat pump stop? | Yes |
|---|---|
| Engineer needed? | Yes |
The heat pump stops until the fault clears or is reset.
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 capacity/configuration parameters.
Who to ask for: refrigeration / heat pump engineer.
Certification: Electrical competence for work inside the unit.
What you might notice
Sources
- Carrier User Interface Comfort Series (NUI 33AW-CS1) Installation Manual, February 2010 ↗ · February 2010 · page 17 · Reviewed 23 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 23 September 2026