Heat pumps · Error codes · iDM Energiesysteme
500iDM Energiesysteme · TERRA SW (2013)
500 on an iDM Energiesysteme TERRA SW: Outdoor unit intake sensor defective: Intake (air) sensor in the outdoor unit defective
Short answer
On an iDM Energiesysteme heat pump, 500 means: Outdoor unit intake sensor defective: Intake (air) sensor in the outdoor unit defective. The manual does not say whether the heat pump stops. An engineer is needed to fix the cause.
Reviewed 23 September 2026 · 1 source
What it means
The manual says: Outdoor unit intake sensor defective: Intake (air) sensor in the outdoor unit defective.
Part involved: Outdoor unit intake sensor defective.
When it shows: Intake (air) sensor in the outdoor unit defective.
Is it safe?
| Does the heat pump stop? | Not stated |
|---|---|
| Engineer needed? | Yes |
The manual does not say whether the heat pump stops.
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.
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