E35 on a Haier Super Aqua R290 Hydro Split / Hydro All-in-One: Four Way Valve Reversing Abnormality
Short answer
On a Haier heat pump, E35 means: Four Way Valve Reversing Abnormality. 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: Four Way Valve Reversing Abnormality.
Part involved: compressor, pressure switch/sensor, expansion valve, refrigerant charge.
When it shows: 1. After the compressor is started, the continuous operation for 10 minutes does not meet the commutation pressure difference 6.0bar. 2. When the cooling 4WV OFF is running, the Two-Twi ≥ 1°C and the Tho-Two>5°C will report the fault for 5 consecutive minutes. When the heating 4WV ON is running, the Two-Twi ≤ -1°C and the Thi-Twi<0°C report the fault for 5 consecutive minutes. The fault is cleared after 3 minutes. If it occurs 3 times in an hour, confirm the failure.
Is it safe?
| Does the heat pump stop? | Yes |
|---|---|
| Severity | Safety lockout |
| Engineer needed? | Yes |
The heat pump stops until the fault clears or is reset.
Resetting itself: yes (until locked).
Manual reset: Locks out after repeated occurrences (see manual remark); engineer reset after the cause is fixed.
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 outdoor unit is not blocked by leaves, debris, snow or ice and that nothing is stored against the grilles.
What the engineer will check
- Follow the manufacturer's troubleshooting flowchart for this code.
- Check refrigerant pressures and charge (F-gas / flammable refrigerant competent person only).
- Check expansion valve, pressure switches/sensors and discharge temperature.
- Check outdoor coil airflow and blockages.
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
- R290 Super Aqua Hydro Split & Hydro All in One Service Manual - Service Diagnosis (SYJS-03-2024 REV.A) ↗ · SYJS-03-2024 REV.A · page p.45 (printed; PDF p.3) · Reviewed 23 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 23 September 2026