061 on an iDM Energiesysteme TERRA SW: Heat source temperature approaching critical value: Heat source outlet temperature reaches a critical value (min. heat source temperature + 2 K)
Short answer
On an iDM Energiesysteme heat pump, 061 means: Heat source temperature approaching critical value: Heat source outlet temperature reaches a critical value (min. heat source temperature + 2 K). 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: Heat source temperature approaching critical value: Heat source outlet temperature reaches a critical value (min. heat source temperature + 2 K).
Part involved: Heat source temperature approaching critical value.
When it shows: Heat source outlet temperature reaches a critical value (min. heat source temperature + 2 K).
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 fault number and text shown after tapping the fault symbol on the Navigator display. Look at the brine/heat-source expansion vessel or pressure gauge: the fluid level should be visible (user guide check). Do not refill or open the ground-loop circuit yourself - call the installer. 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.71 · Reviewed 23 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 23 September 2026