Correct the ECM Controll Wiring Problem

Correct the 24 volt Control Wiring Problem

Before replacing any thermostat, be sure enough time has elapsed to account for built in time delays. If there is 24 volts between Common and (R) at the air handler but not between common and the (G) or (Y) terminals the be sure to check for any control safety switches (condensate overflow switches) before tracing for broken wires, bad wire connections or replacing the thermostat. NOTE: Some ECM modules use DC, or Serial communications … consult the Mfg. instructions on type of communications and communication pin locations.

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2 ECM Low Voltage