Viessmann
The Viessmann Vitodens 050-W 29KW is a wall-hung condensing combi boiler, offering a 29 kW central heating output and a 16.7 lpm domestic hot water flow rate. It supports both natural gas and LPG fuels.
The Viessmann Vitodens 050-W 29KW Condensing Boiler is a wall-hung combi appliance designed for domestic heating and hot water in UK properties. Operating on natural gas or LPG, this model offers a maximum central heating output of 29 kW and a domestic hot water flow rate of 16.7 litres per minute at a 30°C temperature rise. It is engineered for efficiency and integrates with modern control systems.
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Full technical specifications extracted from the manufacturer brochure. Empty sections are hidden.
Bottom connections for heating flow/return, DHW, gas, and condensate drain.
Fill water with a hardness above 300 ppm must be softened.
The Vitodens 050-W 29KW is a gas-fired condensing combi boiler, introduced in 2015. It provides a central heating output ranging from 6.5 kW to 33 kW, with a domestic hot water output up to 35 kW, delivering 16.7 litres per minute at a 30°C temperature rise. This wall-hung unit measures 707 mm high, 400 mm wide, and 350 mm deep. It is compatible with natural gas and LPG, requiring a 22 mm gas pipe connection. Electrical supply is 230V, 50Hz, with a maximum power consumption of 142W. The appliance features bottom connections for heating flow/return, DHW, gas, and condensate drain. Flue options include concentric systems, with a 60/100 mm diameter and a maximum horizontal length of 20 metres. OpenTherm compatibility and weather compensation are integrated, allowing for advanced system control. Safety features include a safety valve and frost protection.
Every fault code listed in the manufacturer brochure, with likely causes and engineer actions. Each code has a permalink — paste a URL like https://www.boilertag.com/boilers/viessmann/vitodens-050-w-type-bpjd-35kw#fault-10 to jump straight to the entry.
| Code | Meaning | Details |
|---|---|---|
| 10 | Constant mode Show causes & actionsShort circuit, outside temperature sensor Engineer action Check the outside temperature sensor and lead (see page 54). | Details |
| 18 | Constant mode Show causes & actionsLead break, outside temperature sensor Engineer action Check the outside temperature sensor and lead (see page 54). | Details |
| 30Lockout | Burner blocked Show causes & actionsShort circuit, boiler water temperature sensor Engineer action Check boiler water temperature sensor (see page 55). | Details |
| 38Lockout | Burner blocked Show causes & actionsLead break, boiler water temperature sensor Engineer action Check boiler water temperature sensor (see page 55). | Details |
| 51 | No DHW heating Show causes & actionsShort circuit, outlet temperature sensor Engineer action Check sensor (see page 57). | Details |
| 52 | Burner blocked Show causes & actionsShort circuit, flow sensor Engineer action Check connections and lead; replace sensor if required. | Details |
| 59 | No DHW heating Show causes & actionsLead break, outlet temperature sensor Engineer action Check sensor (see page 57). | Details |
| 5A | Burner blocked Show causes & actionsLead break, flow sensor Engineer action Check connections and lead; replace sensor if required. | Details |
| A9 | Control mode without OpenTherm influence Show causes & actionsCommunication error, OpenTherm device Engineer action Check connections and lead; replace OpenTherm if required. | Details |
| b0Lockout | Burner blocked Show causes & actionsShort circuit, flue gas temperature sensor Engineer action Check sensor (see page 58). | Details |
| b8Lockout | Burner blocked Show causes & actionsLead break, flue gas temperature sensor Engineer action Check sensor (see page 58). | Details |
| E3Lockout | Burner in a fault state Show causes & actionsFault in safety chain Engineer action Check the temperature limiter and connecting cables (see page 56). | Details |
| E5Lockout | Burner blocked Show causes & actionsInternal fault Engineer action Check the ionisation electrode and connecting cables. | Details |
| F0Lockout | Burner blocked Show causes & actionsInternal fault Engineer action Replace control unit. | Details |
| F1Lockout | Burner in a fault state Show causes & actionsMax. flue gas temperature exceeded Engineer action Check heating system fill level. Check circulation pump. Vent the system. | Details |
| F2Lockout | Burner in a fault state Show causes & actionsTemperature limiter has responded Engineer action Check heating system fill level. Check circulation pump. Vent the system. Check the temperature limiter and connecting cables (see page 56). Reset procedure Press "Reset" (see page 51). | Details |
| F3Lockout | Burner in a fault state Show causes & actionsFlame signal is already present at burner start Engineer action Check ionisation electrode and connecting cable. Reset procedure Press "Reset" (see page 51). | Details |
| F4Lockout | Burner in a fault state Show causes & actionsNo flame signal detected Engineer action Check the ignition/ionisation electrode and connecting cables, check the gas pressure, check the gas train, ignition, ignition module and condensate drain. Reset procedure Press "Reset" (see page 51). | Details |
| F8Lockout | Burner in a fault state Show causes & actionsFuel valve closes too late Engineer action Check gas train. Check both control paths. Reset procedure Press "Reset" (see page 51). | Details |
| F9Lockout | Burner in a fault state Show causes & actionsFan speed too low during burner start Engineer action Check fan, fan connecting cables and power supply; check fan control. Reset procedure Press "Reset" (see page 51). | Details |
| FALockout | Burner in a fault state Show causes & actionsFan idle state not reached Engineer action Check fan, fan connecting cables and power supply; check fan control. Reset procedure Press "Reset" (see page 51). | Details |
| FCLockout | Burner blocked Show causes & actionsElectrical fan control (control unit) faulty Engineer action Check fan connecting cable; replace if required, or replace control unit. | Details |
| FdLockout | Burner blocked Show causes & actionsFault, burner control unit Engineer action Check ignition electrodes and connecting cables. Check whether a strong interference (EMC) field exists near the appliance. Reset procedure Press "Reset" (see page 51). Replace control unit if fault persists. | Details |
| FFLockout | Burner blocked Show causes & actionsFault, burner control unit Engineer action Check ignition electrodes and connecting cables. Check whether a strong interference (EMC) field exists near the appliance. Reset procedure Press "Reset" (see page 51). Replace control unit if fault persists. | Details |
| —ALockout | Burner blocked Show causes & actionsCommunication error between burner control unit and programming unit Engineer action Check connecting cable. Reset procedure Press "Reset" (see page 51). Replace burner control unit or programming unit if the fault persists. | Details |
Patterns that group across the manufacturer's fault-code table. Each entry links to the full code listing further down the page.
Engineer: Check boiler water temperature sensor (see page 55).
Triggered by fault code 30.
Engineer: Check the temperature limiter and connecting cables (see page 56).
Triggered by fault code E3.
Engineer: Check the outside temperature sensor and lead (see page 54).
Triggered by fault code 10.
Engineer: Check sensor (see page 57).
Triggered by fault code 51.
Engineer: Check connections and lead; replace OpenTherm if required.
Triggered by fault code A9.
Common questions from engineers and homeowners about the Viessmann Vitodens 050-W Type BPJD 35kW.
Parts referenced in the manufacturer brochure for routine service and repair.
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Specifications on this page are extracted from the manufacturer brochure. Always cross-check against the latest datasheet before commissioning or quoting. Last updated 28 June 2026.