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When I arrived found American standard gas furnace locked out on a code 3 pressure switch lockout code. Check each spade terminal to ground off of pressure switch and had 27 volts going thru switch . Unplugged molex conection at control board and pushed back in and it made connection and came on. Control board has a loose conection on the board suggested replacing board and switch in cas conections inside switch are wearing out. Furnace is working for now but told them it won’t probably stay working.11-7-19 luis installed new control board for furnace and also new pressure switch calibrated switch to close at 1.15 WC test and cycle furnace ok performed combustion test cycle ok,