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Checked no heat complaint, found furnace trying to cycle, it gets to powering the ignitor but no 120 volts to the ignitor, the inducer runs, the pressure switches closed, and the gas valve gets 24 volts Returned to replace furnace control board. Removed failed control board. Installed new board. Set up new furnace control board, cycled and checked operation. Performed heating maintenance , cleaned burners and flame sensor, inspected heat exchanger. Checked voltage, amperage and electrical conditioners. Tested limit and safety switches. Measured fuel pressures. Performed combustion test. Checked operation and temperature rise.