Heat pumps · Error codes · iDM Energiesysteme
236iDM Energiesysteme · TERRA SW (2013)
236 on an iDM Energiesysteme TERRA SW: Safety defrost interval 0.1-0.5 set: The safety defrost interval is set to 0.1-0.5 h
Short answer
On an iDM Energiesysteme heat pump, 236 means: Safety defrost interval 0.1-0.5 set: The safety defrost interval is set to 0.1-0.5 h. 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: Safety defrost interval 0.1-0.5 set: The safety defrost interval is set to 0.1-0.5 h.
Part involved: Safety defrost interval 0.1-0.5 set.
When it shows: The safety defrost interval is set to 0.1-0.5 h.
Is it safe?
| Does the heat pump stop? | No |
|---|---|
| Severity | Information only |
| Engineer needed? | Yes |
The heat pump keeps running.
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.72 · Reviewed 23 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 23 September 2026