Vaillant gas boiler F.01: what it means and when to call a pro · Czechia
Severity: Stop nowVaillant gas boiler error F.01. The return temperature sensor is disconnected or broken.
Smell gas? Leave the building and call the gas emergency number: 1239
Meaning
The return temperature sensor is disconnected or broken.
Severity
Stop now
Stop. Switch it off and call a pro
Steps are not shown for this code because no qualified person has reviewed them yet. What is safe: switch it off and call a pro.
Source
Installation and maintenance instructions ecoTEC plus VU ..6/6-5 OVZ (H-GB), Vaillant
The repair: Boiler temperature sensor replacement
Prices for repairs in Czechia are in CZK.
Other Vaillant codes
- Vaillant F.10 The flow (outgoing) temperature sensor has a short circuit.
- Vaillant F.11 The return temperature sensor has a short circuit.
- Vaillant F.20 The boiler overheated and the safety temperature limiter cut it out.
- Vaillant F.22 The water pressure in the heating system is too low.
- Vaillant F.23 The temperature difference between flow and return is too large, usually because water is not circulating well.
Brands in our catalog for gas boiler: Ariston, Baxi, Bosch, Ferroli, Ideal, Potterton, Vaillant, Viessmann, Worcester Bosch. The same code on another brand is not in the catalog yet, and we do not guess what it means.