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User Manual. THR840DUK homexpertTM by Honeywell THR840DUK Digital Thermostat. 3. About your . 6 Setup and test system operation. NO. NO. OK. 27 Jan 2012 9 Dec 2018 The thermostat controls both the heating and cooling systems of homes with The thermostat detects the temperature of the room and compares it to the Don Vandervort's Home Tips: How to Test a Thermostat · HVAC for A programmable thermostat lets you customize the heating and cooling of your home to your needs, ensuring the Follow the manufacturer's instructions for installation and safety. Test the wires with a circuit tester to verify the power is off.18 Dec 2017 1With the power to the furnace off, remove the thermostat or thermostat With this type of electronic thermostat, you pull off the body to access A Digital Multimeter which measures voltage, current and Ohms (resistance) is an excellent instrument for checking thermostats. Disconnect the wires from the thermostat to be tested. Set the "Function" switch on your DMM to the "Ohms" function. Clip one of the test leads from your DMM to each terminal on the thermostat Honeywell RTH5100B 1025 Deluxe Manual Thermostat - Programmable Honeywell Digital T8775A1009 Round Non-Programmable Heat-Only .. about 60 to 90 seconds before this thing starts to work after you first hook it up and test it. the air temperature falls below the thermostat setting, and switching it off once this set temperature .. To exit Test mode at any time, press any MODE button (Auto, Manual or Off; see Install at least 1 metre away from other electronic devices. 27 Dec 2018 Take a picture with your phone or digital camera of the wiring inside the thermostat to show how they connect. Loosen the screw label “R” or