Vaillant ECOTEC-PLUS-VHR-20-24-5-5 user manual

The correct settings for a Vaillant Ecotec Plus VHR 20-24/5-5 boiler may vary depending on your specific requirements and preferences. However, here are some common settings that you may need to adjust:
1. Temperature: You can set the desired temperature for heating and hot water using the temperature control buttons on the boiler or the thermostat connected to it. The recommended temperature for domestic hot water is typically around 55-60 degrees Celsius (131-140 degrees Fahrenheit), while the heating temperature should be adjusted based on your comfort preferences.
2. Heating mode: You can select different heating modes such as "On" or "Automatic" on the boiler's control panel. In "On" mode, the heating will remain on continuously, while "Auto" mode allows the system to automatically turn the heating on and off based on the programmed schedule.
3. Timer/programmer settings: If your boiler is equipped with a built-in timer or programmer, you can set the desired heating and hot water schedules. This allows you to customize the operating times to fit your daily routine, ensuring comfort when needed and saving energy when not required.
4. Heating curves: Some Vaillant boilers offer the option to adjust the heating curve settings. The heating curve determines how quickly the radiators heat up and how they react to changes in the outside temperature. This can be fine-tuned to achieve optimal heating comfort and efficiency.
5. System pressure: Regularly check the system pressure gauge on the boiler and maintain the recommended pressure range (usually between 1 and 2 bar). If the pressure is too low, you may need to top up the system by opening the filling loop. If the pressure is too high, you may need to bleed some water from the radiators.
It is recommended to consult the user manual for your specific model of Vaillant Ecotec Plus boiler for detailed instructions on adjusting the settings. Additionally, if you are unsure or unfamiliar with the settings, it's always best to contact a qualified heating engineer or the manufacturer's customer support for assistance.

There could be several reasons why your Vaillant Ecotec Plus system isn't producing hot enough water:
1. Incorrect Thermostat Setting: Your thermostat might not be set to a high enough temperature. Check to see if it's set to at least 60°C (140°F).
2. Faulty Diverter Valve: A diverter valve directs the hot water to either your radiators or your hot water outlets. If it's malfunctioning, it may not be sending the hot water to the right place.
3. Blocked Plate Heat Exchanger: It's a device that transfers heat from one medium to another. So if it's blocked, its heat transfer capability will be decreased and your tap water may become less hot.
4. Defective Gas Valve: If the gas valve isn't opening properly, it won't be supplying enough gas to your boiler to heat up the water.
5. Restricted Airflow- The heating system requires good airflow to operate properly. A blocked flue or air restrictor could make the burner less efficient, hence, reducing the heat it is able to produce.
Please consult a professional engineer to diagnose and repair the issue properly.

The recommended pressure range for a Vaillant Ecotec Plus boiler is typically between 1 to 1.5 bar. It is important to note that this may vary slightly depending on the specific model of the boiler, so it is always best to consult the manufacturer's manual for the correct pressure range for your particular boiler.