Your Thermostat comes with the following default schedule. Follow the next steps to adjust heating schedule. Your Thermostat has optimization functions that aim to save energy while maintaining suitable comfort levels. The Thermostat displays during the optimization period if set. By default optimization is disabled, see instructions on the installation guide on how to activate it. The T3 provides a whole host of energy efficiency measures. A full suite of Optimisation features (Optimum start, Stop and Delayed Start) plus adaptive ‘fuzzy logic’ protocols provide full control of the boiler.

Repeat these steps to make adjustments to the remaining periods and days – or press to save changes and return to the home screen. Replace with 2 new 1.5V LR6 AA Alkaline batteries only – which should last approximately 2 years depending on Thermostat use will flash on the Thermostat when the wireless signal is lost – The Receiver Box LED will flash RED. Other features of benefit to property owners are Automatic Summer & Winter time change, battery low indicators, service timers, fail safe mode and one model covering 5/2 and 7day programming with 4 time periods a day. Press the + or- set the new desired temperature. The programmed schedule will resume at the next programmed setpoint.

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is displayed when battery power has reached approximately 10% – you should be prepared to change them soon. The T3R Thermostat communicates wirelessly to the Receiver Box which is wired to the boiler. If the Thermostat loses wireless communication or becomes faulty, the boiler can be switched on or off manually using the button on the Receiver Box. A thermostat and programmer controlling your home's heating can help reduce your home's energy consumption. will flash when battery power has become critically low – you should change them immediately to make sure there is no disruption to your heating system.

Honeywell Home T3 wired programmable thermostat is providing intuitive time and temperature control, the Honeywell T3 wired programmable thermostat is suitable for use in domestic heating systems, in social housing, new construction and mass installation situations. Compatible with a wide range of boilers and systems including 24 V to 230 V on or off, such as gas and oil boilers, combi-boilers and heat pumps, T3 offers OpenTherm control but are not suitable to control electric heating. For users, the T3 is the ideal choice for homes that require high levels of automatic control that provide significant energy efficiency for a wide range of boilers and systems. The thermostats in the T3 range are compatible with a wide range of boilers and systems including 24–230V on/off such as gas & oil boilers, combi-boilers and heat pumps.T3 thermostats cannot control electric heating. The Thermostat is powered by 2 x AA batteries, although a battery icon is not shown on the display during normal use.

Delayed Start saves energy by slightly delaying the start of heating depending on the difference between the set temperature and the room temperature. is displayed on the Thermostat when the wireless signal is good – The receiver box LED will be solid GREEN.

Users can temporarily override the temperature set point and the current date and time are displayed on the screen Save energy by switching the heating off when not required – e.g. during warmer summer months, or when doors and windows are open for extended periods of time. If the temperature drops to 5°C the heating will come on to prevent the heating pipes freezing. Optimum Stop saves energy by switching off a little bit earlier than the programmed time. If your home is up to temperature, you will not notice the effect on the temperature, but you should see a difference in your fuel bill.The thermostats in the T3 range are compatible with a wide range of boilers and systems including 24–230V on/off such as gas & oil boilers, combi-boilers and heat pumps. OpenTherm control is available. T3 thermostats cannot control electric heating. The T3 Series of programmable thermostats provide sophisticated automatic control of domestic heating systems. They have been developed to provide intuitive heating time and temperature control with a wealth of features that will make the T3 the first choice in a wide variety of installations, including social housing, new construction and mass installation situations. Heat Demand: Room temperature is below setpoint – indicating there is a demand for heating (boiler activity might occur). OFF position has an integral frost protection setting at minimum 5 C so that pipes in the house will never freeze

Optimum Start learns how long it takes your home to reach a set temperature and then turns the heating on a bit earlier to achieve that temperature at the programmed time.

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For specifiers, installers and users, the T3 series offers additional functionality that ensures that users of the controls can be restricted from using the controls incorrectly Press and hold the Left & Right buttons for 5 seconds. The display will show the icon and (depending on the installer setting) the Thermostat will have limited or no keypad functionality. Wireless technology makes upgrading easier and the installation time shorter with less wiring involved. The boiler cycles on and off as it controls the temperature, and sometimes the icon will be displayed when the boiler has cycled off. The installation sequence is intuitive and provides the installer with pre-programmed schedules; cycle rate option for different boiler types. All models have a maintenance alert.