14 on a Carrier heat pump: Loss of signal from inverter board or high temperature release
Short answer
On a Carrier heat pump, 14 means: Loss of signal from inverter board or high temperature release. The heat pump stops until the fault clears or is reset. An engineer is needed to fix the cause. The wording differs by model range — each is shown below.
Reviewed 23 September 2026 · 2 sources
What it means
On the AquaSnap / AquaSnap Plus 30AWH (R410A inverter monobloc, 2010-2018 generations)
The manual says: Loss of signal from inverter board or high temperature release.
Likely causes:
- Inverter board or compressor fault.
On the AquaSnap Plus 30AWH (R410A monobloc)
The manual says: Loss of Signal From inverter board or High Temperature Release.
Likely causes:
- Check cables.
- check inverter board.
Is it safe?
On the AquaSnap / AquaSnap Plus 30AWH (R410A inverter monobloc, 2010-2018 generations)
| Does the heat pump stop? | Yes |
|---|---|
| Engineer needed? | Yes |
The heat pump stops until the fault clears or is reset.
On the AquaSnap Plus 30AWH (R410A monobloc)
Switch the heat pump off at its isolator and call an engineer.
| 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
On the AquaSnap / AquaSnap Plus 30AWH (R410A inverter monobloc, 2010-2018 generations)
- 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.
On the AquaSnap Plus 30AWH (R410A monobloc)
- Read and note the exact code shown on the controller display.
- Check the heat pump's breaker/isolator at the consumer unit is on.
- If the breaker has tripped or trips again, leave the unit off and call an engineer; do not keep resetting it.
What the engineer will check
On the AquaSnap / AquaSnap Plus 30AWH (R410A inverter monobloc, 2010-2018 generations)
- Read inverter board LED codes (manual §9.1/9.2) and check compressor/inverter.
Who to ask for: refrigeration / heat pump engineer.
Certification: F-gas certification (refrigerant circuit work) and electrical competence.
On the AquaSnap Plus 30AWH (R410A monobloc)
- Check cables.
- check inverter board.
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
- Carrier 30AWH AquaSnap Plus Service Manual, Engineering Department of Italy, November 2010 (SM_30AW) ↗ · November 2010 · page 74 · Reviewed 23 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 23 September 2026