Honeywell Wireless Thermostat T3R 7 Day Programmable Y3H710RF0053

The Honeywell T3R is a 7 day programmable wireless thermostat supplied with a matching receiver. It forms part of Honeywell's residential heating control range and provides time and temperature control of a domestic heating system from a room-mounted unit that communicates wirelessly with the receiver wired to the heat source. The thermostat switches the boiler, zone valve or underfloor circuit according to the programmed schedule and the measured room temperature.

• The room temperature drifts away from the set point and the heating does not respond to changes in demand.
• The thermostat display is blank, faint or unresponsive even with fresh AA batteries fitted.
• The receiver fails to switch the boiler on or off when the thermostat calls for heat.
• The wireless link between thermostat and receiver drops out, so commands are not acted on.
• The heating runs continuously, or fails to fire at all, when the unit is set to Auto.

• Confirm the existing thermostat and receiver carry the part number Y3H710RF0053 before ordering a replacement.
• Check whether the heat source is controlled by On/Off switching or OpenTherm, as the wiring and configuration differ.
• Note the existing receiver wiring and terminal arrangement before removal so the replacement can be connected the same way.
• Check the appliance model against the compatibility list to confirm the control is suitable for the installation.