Remove any dust from the thermostat and base plate with a soft artist's brush.4. Probation for broken, frayed or corroded wires and loose wire connections.
Turn off the force to heating and/or cooling systems at the leading avail panel or transaction shutoff switch.
2. Remove the thermostat. On some models, remove the embrace plate and then unscrew the thermostat thing from a wired replica plate secured to the wall. Other models plug into the model plate without screws.
3.While low-voltage thermostats are actual dependable and seldom deficient, thermostat-related problems, such as defective wires or loose connections, may antecedent a failure in your heating or cooling manner. The problems are inconsiderable to catalog, and aloof as clear to establish by manufacture the capture repair or by replacing a defective thermostat.
Instructions
1.
Tighten any loose connections. Applicability wire cutters/strippers to chop damaged wires and strip off approximately 1/2 inch (12 mm) of insulation, then reconnect the wires.
5. Restore the capacity to examination the thermostat. Consult the handbook for your thermostat and disconnect the influence wire (normally blood), then touch it to the terminal for the heat (the terminal decided as W with caucasian wire from heater's transformer).
6. Similarly bypass the thermostat to analysis its cooling avail by touching the disconnected force wire (cardinal) to the terminal for the cooling method (typically treacherous).
7. Whether one or both systems fail to begin, turn off their energy, then describe (peep action 8) and convert any defective wires between the thermostat and the low-voltage transformer(s) at the heating or air-conditioning units.
8. One habit to evaluation thermostat wires--on your heating method, for example--is to disconnect the wires from the thermostat and transformer, wire them stable at one head, and test for continuity at the other end by clipping a continuity tester to one wire and probing the other wire. If the tester fails to light, replace the wires.
9. Check for loose low-voltage wire connections at the transformer or loose line-voltage connections to the transformer (see Fix a Doorbell).
10. If both systems activate, replace the faulty thermostat (see below).
Replace a thermostat
11. Choose a thermostat suitable for your particular system. Read the thermostat labeling and/or consult with a knowledgeable salesperson or HVAC (heating, ventilating and air-conditioning) service professional.
12. Shut off the power to your heating and/or cooling systems at the main service panel or system shutoff switch.
13. Remove the old thermostat as described above.
14. Disconnect all wires from the base plate one at a time and tape a label on each that identifies its terminal connections (R, Y, W and so forth).
15. If the new thermostat base does not cover the old mounting holes, either patch them and touch up the paint (see Repair Minor Drywall Damage) or install the cover ring that the new unit may provide.
16. Mount the new thermostat to the wall, leveling it according to the manufacturer's instructions. Typically, you can align notches with a level or plumb line on the wall, or place a small level on leveling posts at the base or its edge.
17.Use the wiring chart provided in the installation instructions to associate the labeled wires to the appropriate terminals, removing the tape as you make the connections.
18. If applicable, install batteries and program the thermostat.
19. Attach the thermostat to the base and restore power.
