BoilerFaultCodesViessmann E3 Fault Code
The Viessmann E3 fault code means: your boiler has detected that it is getting too hot inside because the heat isn't moving away properly, so it has safely shut down to prevent damage.. It appears on 13 Viessmann models in our database.
Technical description: Ensure adequate heat transfer. Press reset button R.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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Viessmann models that show the E3 fault code
Click a model for the full fault code list and model-specific repair notes.
- Vitodens 050-W Repair: £150-300
- Vitodens 050-W BPJD 35kW Combi Boiler Repair: £150-350
- Vitodens 100-W B1HA-19
- Vitodens 100-W B1HA-26
- Vitodens 100-W B1HA-30
- Vitodens 100-W B1HA-35
- Vitodens 100-W B1KA-26
- Vitodens 100-W B1KA-30
- Vitodens 100-W B1KA-35
- Vitodens 111-W B1LB 26kW Repair: £150-350
- Vitodens 111-W B1LB 35kW Repair: £150-350
- Vitodens 242-F B2UA
- Vitodens 242-F FB2B Repair: £150-350
Source
Viessmann E3 fault code information on this page is sourced and cross-checked against the official Viessmann service / installation manuals for each affected model.
- Viessmann Vitodens 050-W BPJD 35kW Combi Boiler manual (PDF)
- Viessmann Vitodens 100-W B1KA-35 manual (PDF)
- Viessmann Vitodens 111-W B1LB 35kW manual (PDF)
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 31 August 2026