I have replaced thermostat with a new one, changed the circuit board out twice due to wasn't getting power to thermostat. when I power up after wiring in connections. fan comes on for a moment along with thermostat and then i lose power to thermostat again. fuse is not blown on circuit board, 24 volts going in but not out.

  • What model is the air handler? – ThreePhaseEel Apr 2 at 22:35

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