How can we help?

Having trouble? Click here to access our troubleshooting guide.

Your Question:

vSMART Engineer Support


Welcome to the vSMART Engineer Technical Support section. Please use the different sections below to find answers to your technical questions. If you require further assistance type your question in the questions bar above and click "ASK". You can also find a range of useful contact numbers, including Technical support, here.  


Engineer FAQs


What kind of appliance is it?

The vSMART is an internet connected Smart control that can be installed on eBUS enabled combi boilers as well as EBUS enabled system boilers that have a relevant Vaillant wiring centre.

How do I install it?

Disconnect the wall bracket from the gateway and remove the e-bus connector cap. Wire the e-bus cable (no polarity) and connect the 230V supply adaptor. Close the gateway and connect the e-bus cable to boiler e-bus connection.

Where can I download the software?

Please check the downloads section below

How do I pair the vSMART?

>The pairing process is split in two steps. >1). Bluetooth connection has to be set between your mobile device and vSMART; 2). The vSMART is able to collect all necessary data to establish the WLAN connection to the router. To perform those operations, download the vSMART App, install it on your mobile device and simply follow the installation assistant:

What is the advanced menu?

What is delayed start/ optimum start?

Optimum start or delayed start is a feature for the programmer. Normally you set the program times for when you want the heating to come on and turn off. With this feature you set the program times for when you want to be warm and the system decides when it needs to turn on. When the house is cold it turns on early but in mild weather it will switch the boiler on later because it doesn't take very long to warm the house up.

What is a load compensator/ weather compensator?

A load compensator adjusts the radiator circulating temperature to be hotter when the house is cold. The weather compensator does the same depending on the weather (measured using an outside thermometer). This means you can run the radiators cooler when less heating is needed. This is a good thing because condensing boilers are more efficient at lower temperatures: ideally the water returning to the boiler should be no warmer than 55C.

What is the setback temperature?

Some programmable thermostats have a setback temperature which is like a default or standby temperature - when the heating isn't 'on', for example overnight, it will still maintain the house at this temperature.

What is a boiler interlock?

This is the system which allows your thermostat and programmer to tell the boiler when to turn on and off.

Why would I want a presence sensor?

A presence sensor connected to your radiator valves can turn them down by 1 or 2 degrees when you aren't in the room - enough to save some energy but not enough that it can't warm up quickly when needed. If your house has a high thermal capacity it may take too long to warm up for this to be useful.


Available Literature


Installation Manual Brochure User Guide



Fault Finding Sections

Use the sections below for any detailed technical help you may need.



Technical Information


Height (mm)



Width (mm)



Depth (mm)



Power supply

3 x 1,5 V (AAA)


Battery life

Approx. 2 years




50/60 Hz

Current consumption


< 2W

Level of protection



Adjustable temperature range

7 to 30°C


Ambient temperature

< 50°C

< 50°C

Communication frequency

868 MHz

868 MHz

868 MHz transmission power

+10 dBm

+10 dBm

Receiver category



Relative activation duration


< 0.1%

WLAN type


802.11 b/g/n (2.4 GHz)

WLAN transmission power


< +16 dBm

WLAN supported network encryption



Bluetooth type



Bluetooth transmission power


+10 dBm

Maximum communication range, outdoor

100 m


Maximum communication range, indoors

25 m



Fault Finding

Click here for Advanced Fault Finding.

Were we able to answer your question(s)?