Vokera Vibe fault A80
Return probe fault / return probe overtemperature / return-flow sensor differential
Gas boilerWhat it means
Combined code covering three alarm conditions: return probe fault (transitional), return probe overtemperature (definitive), and return-flow sensor differential fault (definitive).
Likely causes
- Return probe fault
- Overtemperature condition at return probe
- Excessive differential between return and flow sensor readings - possible poor circulation
- Faulty return probe
Where to start
- Check return probe wiring and resistance
- Check for overtemperature condition at return probe
- Compare return and flow sensor readings for abnormal differential
The full answer, free
- How to put it right, step by step
- The manual page for this fault (page 28), right under the answer
Safety: Isolate gas and power before you open the case. If you have been into the gas side, do a tightness test, and a combustion and flue check before you hand back. Gas Safe (UK) or RGI (Ireland) work only.
From the Vokera manual for the Vibe. Check the model on the data plate before you order parts.
Other Vokera Vibe fault codes
- A10Flame lockout / condensate drain obstructed / flue gas exhaust/air suction obstructed
- A30Fan fault
- A40Fill the system
- A41Fill the system (transitional)
- A59High power supply voltage
- A60DHW probe fault
- A70Flow sensor fault / flow sensor overtemperature / flow/return sensor differential
- A90Flue gas probe fault
- A91Reset operating hours counter (related to fault A91)
- AF1Heating anti-freeze protection active
- AF2DHW anti-freeze protection active
- CFSService call signal / periodic boiler control
- E091Heat exchanger cleaning required (unusual usage threshold)
- SFSSTOP FOR SERVICE (permanent inhibition)