Ed on a Gree Versati II: outlet temperature High-temp protection (This error code will not displayed on wired controller but only on mainboard of outdoor unit)
Short answer
On a Gree heat pump, Ed means: outlet temperature High-temp protection (This error code will not displayed on wired controller but only on mainboard of outdoor unit). The manual does not say whether the heat pump stops. An engineer is needed to fix the cause.
Reviewed 23 September 2026 · 1 source
What it means
The manual says: outlet temperature High-temp protection (This error code will not displayed on wired controller but only on mainboard of outdoor unit).
Part involved: water flow switch, circulation pump, water temperature.
Likely causes:
- The resistance of temperature sensor is not correct.
- The plug on temperature sensor is not correctly connected to the socket on mainboard.
- Mainboard of outdoor unit is damaged.
Is it safe?
| Does the heat pump stop? | Not stated |
|---|---|
| Severity | Fault — needs a manual reset once the cause is fixed |
| Engineer needed? | Yes |
The manual does not say whether the heat pump stops.
Resetting itself: no.
Manual reset: Press ON/OFF key to clear.
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.
- Check the heating system pressure gauge shows the pressure your installer set (typically about 1-2 bar); if it is low, report it rather than refilling unless you have been shown how. Check any filling loop is closed.
- Check radiator valves / underfloor zones are open and thermostats are calling for heat.
- In freezing weather keep the heat pump powered on (its frost protection relies on power) and check the outdoor unit is clear of snow/ice.
What the engineer will check
- Follow the Gree troubleshooting flowchart for this code in the service manual.
- Follow the manufacturer's troubleshooting flowchart for this code.
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 Service Manual Versati II (T1/R410A/50Hz, GC201308-) ↗ · GC201308 · page p.62 (printed; PDF p.65) · Reviewed 23 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 23 September 2026