Heat pumps · Error codes · Technibel S.A.S.
FLTechnibel S.A.S. · Technibel PHRIE / PHIE inverter monobloc air-to-water (medium temperature)
FL on a Technibel S.A.S. Technibel PHRIE / PHIE inverter monobloc air-to-water: Water flow fault in heat pump (see hydraulic alarms)
Short answer
On a Technibel S.A.S. heat pump, FL means: Water flow fault in heat pump (see hydraulic alarms). 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: Water flow fault in heat pump (see hydraulic alarms).
Likely causes:
- No water flow.
Is it safe?
| Does the heat pump stop? | Yes |
|---|---|
| Engineer needed? | Yes |
The heat pump stops until the fault clears or is reset.
Resetting itself: Manual reset.
What you can check
- Note the code/LED pattern and the model from the rating plate, then contact a heat pump/refrigeration engineer.
- Check the heat pump's breaker/isolator at the consumer unit is on.
- Check the heating system pressure gauge reads in the normal range stated by the installer (usually about 1-1.5 bar cold) and that the filling loop is closed.
What the engineer will check
- See §5.2.
Who to ask for: refrigeration / heat pump engineer.
Certification: Electrical competence for work inside the unit.
What you might notice
Sources
- Technibel PHRIE / PHIE inverter monoblock air to water heat pump, medium temperature, R410A - Service Manual (Jun. 2015, 10 12 211 - GB - 06) ↗ · 10 12 211 - GB - 06 · page 118 · Reviewed 23 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 23 September 2026