244 on an iDM Energiesysteme TERRA SW: Flow monitoring heating side in bivalent operation: Works like fault 44 but acts on the bivalent generator when the charging pump is configured "YES"; heating-side flow monitor responded
Short answer
On an iDM Energiesysteme heat pump, 244 means: Flow monitoring heating side in bivalent operation: Works like fault 44 but acts on the bivalent generator when the charging pump is configured "YES"; heating-side flow monitor responded. The heat pump keeps running with some functions stopped. An engineer is needed to fix the cause.
Reviewed 23 September 2026 · 1 source
What it means
The manual says: Flow monitoring heating side in bivalent operation: Works like fault 44 but acts on the bivalent generator when the charging pump is configured "YES"; heating-side flow monitor responded.
Part involved: Flow monitoring heating side in bivalent operation.
When it shows: Works like fault 44 but acts on the bivalent generator when the charging pump is configured "YES"; heating-side flow monitor responded.
Is it safe?
| Does the heat pump stop? | Partly |
|---|---|
| Engineer needed? | Yes |
The heat pump keeps running with some functions stopped.
What you can check
- Note the fault number and text shown after tapping the fault symbol on the Navigator display. Check the heating-system pressure gauge is in the range given in the user guide - do not top up yourself unless you have been shown how; check radiator/underfloor valves and room thermostats are open. 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