Honeywell Evohome Frequently Asked Questions

'COMMS FAULT' means that the Evohome control unit is not receiving any signal from another device. This can be caused by several reasons. However, the main reason is usually that the Evohome control unit has not been correctly paired with another Evohome device or the signal transmission is being interfered with by another RF device and too large an obstacle. The first step should be an RF signal test. You can start this on the Evohome control unit by selecting the 'System test' function. The test is described on page 29 of the installation manual. If the RF signal is weak, then you need to relocate the device to a less disturbed position. If the test shows a strong signal, then try to find another cause that might be affecting the transmission. As a last resort, choose to re-pair the device, or at least the part with the 'COMMS FAULT' error. This must be done by completely unpairing and carefully re-pairing.

The Evohome system uses TPI (Time Proportional & Integral) control. The system will not wait for your room to cool down before heating it again. Instead, it learns all about your zones and will control them as needed to keep them in a comfortable setting. To achieve this function, Evohome uses an advanced control system that anticipates the load and heat demand before the room cools down and adds the required amount of energy directly to the selected room. When setting values in the proportional band, the BDR91 relay unit may frequently switch on and off. This is completely normal and is the way TPI thermostats ensure room temperature.

The Evohome control system allows you to control up to 12 independent zones, including a domestic hot water (DHW) tank. Each zone has its own weekly time schedule. The temperature can be quickly and efficiently adjusted with a single touch on the EvoTouch, digital head, or mobile app.

One of the main advantages of the Evohome set is that its elements communicate wirelessly at a frequency of 868 MHz. During installation, there is no need to cut into the wall, which saves money and time. The usual communication range in building conditions is around 30 meters, which is a sufficient distance even for a family house. The range of Honeywell Evohome can be verified with a simple test. Try installing a Wi-Fi modem to the boiler unit, then in the upper floor or the furthest room, check if the signal strength is sufficient - for example, by loading a page on your mobile.

If the Wi-Fi reaches, everything should work. The radio signal for controlling the heads is typically "somewhat" stronger than the mentioned Wi-Fi.

The HR92EE heads are among the quietest on the market, which you will surely appreciate in the bedroom, where they will not disturb your sleep. The heads are powered by two AA batteries, which last about 2 years. The heads will alert you to battery depletion by flashing and displaying a battery symbol.

You do not need it. The EvoTouch control unit has an integrated Wi-Fi adapter, which you can use to connect it to your home WiFi network.

Yes, it will. Multiple underfloor heating circuits and a radiator can be paired to one heating zone, which you can conveniently control via the Honeywell app on your smartphone.

Installing multiple Wi-Fi thermostatic heads in one room is not a problem, but it is necessary to designate one that will measure the temperature. The other Wi-Fi thermostatic heads will only control the flow to the radiator. If you have not used all 12 heating zones, you can divide the room into more zones and control each radiator separately.

There is no need to buy the entire Honeywell Evohome. The solution is to purchase a set for single-zone regulation Y87RFC2074 + 1 x Honeywell Round T87RF2025.

The Y87RFC2074 set consists of a wireless Honeywell Round thermostat (one Honeywell Round thermostat for each apartment), a BDR 91 relay unit designed to switch the heat source. It also includes an RFG 100 internet gateway, which allows you to control the heating via an app on your smartphone.

More about the Y87RFC2074 set can be found here.

You do not need to. If you do not want to control the heating via phone, it is sufficient to purchase the intelligent digital head Honeywell TheraPro HR90EE. If you are considering purchasing Evohome in the future, we recommend buying the digital head HR92EE.

More about the thermostatic head HR90EE and HR92EE can be found here

Yes, the Honeywell Evohome system works for most boilers regardless of fuel. The exception is boilers with their own communication, such as Opentherm or Modus brands. The boiler relay, which is connected to the boiler's power terminals, is used for boiler sensing.

You do not need it. Honeywell Evohome synchronizes with the Honeywell cloud according to the internal identification number of each Evohome unit. This means you can connect to your device from anywhere in the world using the app on your smartphone.