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AW000873-G 38
Avoid problem with the thermostat, do not use a floating or incorrect common wire.
If a common wire is run and power is not available at the thermostat, one of the wires may be faulty. This is
more likely in older houses. In that case, it is recommended to test for continuity on the wires. If no continuity
is detected, the wiring likely needs to be replaced.
To test for continuity, replace the original wire with a spare wire (if available) and retest. If the new wire works,
the old wire is likely faulty, and should be replaced.
It is also possible that the wiring has been modified over time. Twist-on wire connectors (such as Marrette or
Marr connectors) or couplers may have been used to couple the wires, and it is likely that the wiring at one end
is a different color than the wiring at the other. In this case, to determine where the problem lies, record the
colors and trace them from the HVAC equipment to the backplate.
To help isolate faults, disconnect the thermostat, jumper R, and the output that you are testing. To avoid
damaging the thermostat, remove the jumper before connecting the thermostat.
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