Heat pumps · Error codes · iDM Energiesysteme
506iDM Energiesysteme · TERRA SW (2013)
506 on an iDM Energiesysteme TERRA SW: Outdoor unit low pressure: Outdoor unit low pressure fault
Short answer
On an iDM Energiesysteme heat pump, 506 means: Outdoor unit low pressure: Outdoor unit low pressure fault. 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: Outdoor unit low pressure: Outdoor unit low pressure fault.
Part involved: Outdoor unit low pressure.
When it shows: Outdoor unit low pressure fault.
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 fault number and text shown after tapping the fault symbol on the Navigator display. Check the outdoor unit is not blocked by snow, ice, leaves or debris and that airflow around it is clear. If the fault recurs several times, contact iDM customer service/your installer.
What the engineer will check
- Diagnose per iDM service documentation for the unit (not obtained): check the monitored circuit/component named in the fault.
Who to ask for: heat pump engineer.
Certification: F-Gas category I certificate (refrigerant circuit work).
What you might notice
Sources
- IDM Wärmepumpen mit Navigatorregelung 2.0 - Bedienungsanleitung (812152 Rev.3) ↗ · 812152 Rev.3 · page p.73 · Reviewed 23 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 23 September 2026