034 on an iDM Energiesysteme TERRA SW: Fan fault: Fault contact of the fan electronics has responded (< 3 times in 24 h)
Short answer
On an iDM Energiesysteme heat pump, 034 means: Fan fault: Fault contact of the fan electronics has responded (< 3 times in 24 h). 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: Fan fault: Fault contact of the fan electronics has responded (< 3 times in 24 h).
Part involved: Fan fault.
When it shows: Fault contact of the fan electronics has responded (< 3 times in 24 h).
Is it safe?
| Does the heat pump stop? | Yes |
|---|---|
| Severity | Fault — clears by itself when the condition goes |
| Engineer needed? | Yes |
The heat pump stops until the fault clears or is reset.
Resetting itself: Counts towards 24 h lockout thresholds.
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: Qualified electrician / heat pump engineer (electrical fault-finding).
What you might notice
Sources
- IDM Wärmepumpen mit Navigatorregelung 2.0 - Bedienungsanleitung (812152 Rev.3) ↗ · 812152 Rev.3 · page p.70 · Reviewed 23 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 23 September 2026