Ec on a Gree heat pump: Water flow switch protection
Short answer
On a Gree heat pump, Ec means: Water flow switch protection. The manual does not say whether the heat pump stops. An engineer is needed to fix the cause. The wording differs by model range — each is shown below.
Reviewed 23 September 2026 · 6 sources
What it means
On the Versati II (R410A)
The manual says: Water flow switch protection.
Part involved: water flow switch, circulation pump, water temperature.
Likely causes:
- The switch is damaged.
- The wire of the switch is loose.
- The position of the switch is wrong.
On the Versati III Monobloc (R32)
The manual says: Heat pump-water flow switch.
Part involved: water flow switch, circulation pump, water temperature.
On the Versati III Split / All-in-one (R32)
The manual says: Protection for the flow switch of the heat pump.
Part involved: water flow switch, circulation pump, water temperature.
On the Versati IV Monobloc (R32)
The manual says: Water switch error.
Part involved: water flow switch, circulation pump, water temperature.
Likely causes:
- The switch is damaged.
- The wire of the switch is loose.
- The position of the switch is wrong.
On the Versati IV Split / All-in-one (R32)
The manual says: Protection for the flow switch of the heat pump.
Part involved: water flow switch, circulation pump, water temperature.
On the Versati V R290 Monobloc
The manual says: Protection for the flow switch of the heat pump.
Part involved: water flow switch, circulation pump, water temperature.
Is it safe?
On the Versati II (R410A)
| 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: It will be cleared after the unit is energized again.
On the Versati III Monobloc (R32)
| Does the heat pump stop? | Not stated |
|---|---|
| Engineer needed? | Yes |
The manual does not say whether the heat pump stops.
Resetting itself: unknown.
On the Versati III Split / All-in-one (R32)
| Does the heat pump stop? | Not stated |
|---|---|
| Engineer needed? | Yes |
The manual does not say whether the heat pump stops.
Resetting itself: unknown.
On the Versati IV Monobloc (R32)
| 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: It will be cleared after the unit is turned off.
On the Versati IV Split / All-in-one (R32)
| Does the heat pump stop? | Not stated |
|---|---|
| Engineer needed? | Yes |
The manual does not say whether the heat pump stops.
Resetting itself: unknown.
On the Versati V R290 Monobloc
| Does the heat pump stop? | Not stated |
|---|---|
| Engineer needed? | Yes |
The manual does not say whether the heat pump stops.
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.
- 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.
- Check water pressure, strainer/filter and air in the system.
- Check circulation pump operation and flow sensor/switch.
- Check heater safety thermostats and wiring.
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
- VERSATI III Air To Water Heat Pump (Monobloc) Service Manual ↗ · page p.121 (printed; PDF p.121) · Reviewed 23 September 2026
- Service Manual for VERSATI R32 SPLIT (VERSATI III Split Type Air To Water Heat Pump) ↗ · page p.108 (printed; PDF p.112) · Reviewed 23 September 2026
- Air-to-water Heat Pump Owner's Manual (Versati IV Monobloc, SG version) ↗ · page p.55 (printed; PDF p.59) · Reviewed 23 September 2026
- VERSATI IV Split Type Air To Water Heat Pump Service Manual ↗ · page p.66 (printed; PDF p.76) · Reviewed 23 September 2026
- VERSATI V Monobloc Type Air-to-water Heat Pump Service Manual (R290) ↗ · page p.30 (printed; PDF p.33) · Reviewed 23 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 23 September 2026