Heat pumps · Error codes · Climaveneta / De Longhi Professional
Er45Climaveneta / De Longhi Professional · De'Longhi Professional / Climaveneta BWR MTD and MTD2 brine-to-water heat pump
Er45 on a Climaveneta / De Longhi Professional De'Longhi Professional / Climaveneta BWR MTD and MTD2 brine-to-water heat pump: Clock fault error (automatic reset) - replace controller
Short answer
On a Climaveneta / De Longhi Professional heat pump, Er45 means: Clock fault error (automatic reset) - replace controller. The heat pump keeps running. An engineer is needed to fix the cause.
Reviewed 23 September 2026 · 1 source
What it means
The manual says: Clock fault error (automatic reset) - replace controller.
Likely causes:
- Controller/maintenance condition.
Is it safe?
| Does the heat pump stop? | No |
|---|---|
| Severity | Warning |
| Engineer needed? | Yes |
The heat pump keeps running.
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
- See manual p49 solution column.
Who to ask for: refrigeration / heat pump engineer.
Certification: Electrical competence for work inside the unit.
What you might notice
Sources
- Climaveneta WWR MTD - MTD/S, BWR MTD - MTD/S Installation and User Manual (GB 03/2010) ↗ · GB 03/2010 · page 49 · Reviewed 23 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 23 September 2026