Trianco High Temperature Air Source Heat Pump R290 fault E03
Water flow switch protection
Heat pumpWhat it means
Water flow switch protection indicating insufficient or absent water flow detected.
Likely causes
- Water pump failure
- The water circuit filter is dirty and blocked
- The water flow switch is false connected or damaged
Where to start
- Check Water Flow reading to confirm flow rate is present
- Check Coil Temp reading for refrigerant coil condition
- Check Low Pressure reading against expected refrigerant circuit pressure
The full answer, free
- The readings and component tests from the manual
- How to put it right, step by step
- The manual page for this fault (page 34), right under the answer
Safety: Isolate the outdoor unit and any backup heater, and give the inverter capacitors time to discharge before you open the electrics. Anything on the refrigerant circuit needs F-gas certification.
From the Trianco manual for the High Temperature Air Source Heat Pump R290. Check the model on the data plate before you order parts.
Other Trianco High Temperature Air Source Heat Pump R290 fault codes
- E08Communication fault
- E103Fan motor overload protection
- E29Secondary antifreezing protection (water inlet≤A04-2°C)
- F03PFC fault
- F05DC bus over voltage
- F06DC bus under voltage
- F07AC input under voltage
- F09Input voltage sampling fault
- F13IPM overheat stop
- F15Input voltage lacking phase
- F16Compressor weak magnetic protection alarm
- F20IGBT power device overheat alarm
- F26IGBT power device overheat fault
- P01Water inlet temp. sensor fault
- P02Water outlet temp. sensor fault
- P032Hot water tank temp. sensor fault
- P04Ambient temp. sensor fault
- P101EVI inlet temp. sensor fault
- P102EVI outlet temp. sensor fault
- P153Coil temp. sensor fault
- P17Water outlet temp. sensor fault
- P181Exhaust temp. sensor fault
- P182Exhaust over temp
- P191Antifreeze temp. sensor fault