Joule Modul Air fault 71
Over-temperature flow protection triggered
Heat pumpWhat it means
If the water temperature in the system exceeds the pre-set value (75°C), the over-temperature reset button may need to be reset. Error code 71 on the Modul-AIR signals this condition.
Likely causes
- Water temperature in the system exceeded the pre-set value of 75°C
- Central heating system not properly vented (air present in system)
Where to start
- Check whether the central heating system is properly vented by operating the manual air vent on top of the Modul-AIR and starting the venting cycle
- Confirm if only water comes out of the deaerator (properly vented) or if air also comes out (needs re-venting)
- After reset, check if sensor error 71 has been resolved - this can only occur when the water temperature has reduced by a minimum of 10K
The full answer, free
- 5 more checks in order
- The readings and component tests from the manual
- How to put it right, step by step
- The manual page for this fault (page 100), 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 Joule manual for the Modul Air. Check the model on the data plate before you order parts.
Other Joule Modul Air fault codes
- 12No communication with the room thermostat
- 13No communication with the boiler
- 20Filter reached end of lifespan
- 30Top tank temperature sensor error
- 31Bottom tank temperature sensor error
- 32Back up heater water heater temperature sensor error
- 35Airflow sensor error - green comfort module
- 80No temperature difference across the condenser
- 95Water pressure is critically low (< 0.3 bar)