A019 on a Climaveneta / De Longhi Professional De'Longhi Professional / Climaveneta i-KI MTD / i-KIR MTD DC-inverter air/water heat pump: Difference between low and high pressure in refrigerant circuit too low
Short answer
On a Climaveneta / De Longhi Professional heat pump, A019 means: Difference between low and high pressure in refrigerant circuit too low. 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: Difference between low and high pressure in refrigerant circuit too low.
Likely causes:
- Refrigerant pressure/charge problem.
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
- Check refrigerant circuit pressure and charge.
Who to ask for: refrigeration / heat pump engineer.
Certification: F-gas certification (refrigerant circuit work) and electrical competence.
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