Trianco High Temperature Air Source Heat Pump R290 fault P191
Antifreeze temp. sensor fault
Heat pumpWhat it means
Fault indicating an issue with the antifreeze temperature sensor circuit, likely open or short circuit condition detected outside valid resistance range.
Likely causes
- Faulty or loose connection
- Sensor resistance out of range (open or shorted sensor)
Where to start
- Check the connection
- Measure the resistance of sensor
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 37), 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
- E03Water flow switch protection
- 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