HE on a Technibel S.A.S. Technibel PHRIE / PHIE inverter monobloc air-to-water: Electric support heater fault: heat pump circuit water pressure too low or heater safety thermostat tripped (80 C auto / 115 C manual)
Short answer
On a Technibel S.A.S. heat pump, HE means: Electric support heater fault: heat pump circuit water pressure too low or heater safety thermostat tripped (80 C auto / 115 C manual). 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: Electric support heater fault: heat pump circuit water pressure too low or heater safety thermostat tripped (80 C auto / 115 C manual).
Likely causes:
- Low water pressure.
- Heater overheat.
Is it safe?
Switch the heat pump off at its isolator and call an engineer.
| Does the heat pump stop? | Yes |
|---|---|
| Engineer needed? | Yes |
The heat pump stops until the fault clears or is reset.
Resetting itself: Automatic recovery.
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
- Check water pressure and flow.
- Check thermostats; if manual thermostat tripped inspect heater/insulation for damage.
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