How do you set a timer on a Vaillant boiler?
Table of Contents
To set a mechanical boiler timer, follow these steps:
- Make sure the dial arrow is pointed to the current time. As we progress through the seasons, hours move forward and backwards.
- Push the pins in at the times you want the boiler to turn on.
- Set the mechanical timer to timer mode.
What is the timer symbol on a Vaillant boiler?

Dotty. This function is used to prevent frequent on/off operations, and therefore contributes to prolonging the life of your boiler. The symbol also appears if the boiler is in a waiting period.
Do Vaillant boilers have timers?
The timer uses a mechanical clock face control with the ability to turn the boiler on/off in 15 minute intervals over a 24 hour period. The Vaillant ecoTEC 150 Analogue time clock is the most simple, yet affordable timer in the Vaillant ecoTEC range.
Why won’t my Vaillant boiler turn off?
The only way of being able to resolve this yourslf is to turn the mains power off to the heating system. After leaving if off for a few seconds turn it back on and this may have reset the issue. If it hasn’t stopped being a new build I would contact the boiler manufacture as the boiler will be under warranty.

What temperature should my Vaillant boiler be set at?
Meanwhile, we recommend the water heating temperature to be set at around 60 degrees celsius. Setting this any higher can increase the risk of scaling within your system, so is ill advised. This setting should again provide an ideal balance of heating performance and efficiency for the majority of homes..
Why is the timer on my boiler not working?
Often an interruption to the power supply can cause the boiler timer to reset, especially on some older models. Be sure to check the time is accurate. If there is no problem, it could be a simple as checking the fuses.
Why is my boiler on when the timer is off?
Your boiler being on when the timer is off can be due to several issues, including malfunctioning thermostats, valve issues, electrical wiring issues, or other glitches. This can result in massive energy consumption and higher utility costs.
What is time switch on Vaillant boiler?
Flexible heating control – the device let’s you set the time you’d like your heating to switch on and off each day, with up to 48 on/off times. *timeSWITCH 150 needs to be bought with a Vaillant VRT 50 digital room thermostat so you can control the boiler temperature from elsewhere in your home.
Why choose Vaillant for your boiler control?
At Vaillant we manufacture our own controls and thermostats specifically designed to operate our boilers and heat pumps in the most efficient way – helping meet Boiler Plus. You can choose from simple analogue heating timers to smartphone App based thermostat controls that allow homeowners to manage their heating wherever they are.
Where can I get the best Vaillant advance control?
Your local Vaillant Advance installer will be able to recommend the best control to suit your needs.
Why do I need a Vaillant VRT 50 Digital room thermostat?
*timeSWITCH 150 needs to be bought with a Vaillant VRT 50 digital room thermostat so you can control the boiler temperature from elsewhere in your home. To get in touch with an installer for a free no obligation quotation, simply enter your postcode. You will be provided with a list of both regional and local installers who cover your area.