A123 on a Climaveneta / De Longhi Professional De'Longhi Professional / Climaveneta i-KI MTD / i-KIR MTD DC-inverter air/water heat pump: i-KI/i-KIR general alarm - problems relating to the heat pump (see heat pump PCB display codes)
Short answer
On a Climaveneta / De Longhi Professional heat pump, A123 means: i-KI/i-KIR general alarm - problems relating to the heat pump (see heat pump PCB display codes). 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: i-KI/i-KIR general alarm - problems relating to the heat pump (see heat pump PCB display codes).
Likely causes:
- Heat pump outdoor unit fault.
Is it safe?
| Does the heat pump stop? | Yes |
|---|---|
| Engineer needed? | Yes |
The heat pump stops until the fault clears or is reset.
Resetting itself: Reset from room controller: press the two indicated buttons 3 s, select and confirm reset (p57).
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
- Read heat pump PCB display code (table p59-60).
Who to ask for: refrigeration / heat pump engineer.
Certification: Electrical competence for work inside the unit.
What you might notice
Sources
- Climaveneta i-KI MTD / i-KIR MTD (i-EM2 / i-EMR2) 0011m-0061m Installation - User - Maintenance Manual (EN 10/2010) ↗ · EN 10/2010 · page 58 · Reviewed 23 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 23 September 2026