Heat pumps · Error codes · Hisense
F3Hisense · Hi-Therma Monobloc (R32)
F3 on a Hisense Hi-Therma Monobloc: Alarm sent by Outdoor unit (Outdoor unit alarm EE)
Short answer
On a Hisense heat pump, F3 means: Alarm sent by Outdoor unit (Outdoor unit alarm EE). 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: Alarm sent by Outdoor unit (Outdoor unit alarm EE).
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: unknown.
What you can check
- Note the code shown on the controller and the unit model numbers (on the rating plate label) before contacting your installer.
- Check the heat pump's breaker/isolator at the consumer unit is on; do not open any casing.
What the engineer will check
- Read the outdoor unit 7-segment display for the originating alarm code and follow its flowchart.
Who to ask for: Heat pump engineer.
Certification: Heat pump installer competence; F-gas / flammable-refrigerant (R290/R32) handling competence for any refrigerant-circuit work.
What you might notice
Sources
- Air-to-Water Heat Pump Technical, Installation and Service Handbook - Hi-Therma Series (TCY12021017E) ↗ · TCY12021017E · page p.334 (printed; ManualsLib viewer p.355) · Reviewed 23 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 23 September 2026