Why wont my maytag washer model HAV6000AWW fill with hot water?

Several Reasons. Make sure that the hot water is turned on and flowing. remove and clean or replace any cone filters. try swapping the hot and cold lines and see if water will flow. Try giggling the selector switch. If it does not flow still, there could be a problem with the wiring inside the washer, the selector or timer switch may be malfunctioning or the valve assembly (the part where you hook the hoses up on the washer) may be broken or frozen. Have someone familiar with working with electricity check it out.