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Very likely the air pressure switch, which is a normally closed switch, has either shorted or gone bad and is not sensing the air pressure to it, and leaving the alarm on. They are usually firewall mounted to a block of others as well. Check there first.
Are you draining water from the air tanks. There should be small taps on the bottom of all air tanks. Locate these and open slowly when system is under pressure. Make sure you close them when finished.
It is probable that the switch involved in inside the door. In that case, it will be a _big_ job to disconnect it. If that is the case, you could try locating the buzzer itself (somewhere under the dashboard) and disconnecting it, with the hope that the buzzer itself is causing most of the battery drain. The switch in the door will also cause drain, but perhaps not a lot, and perhaps not at all once the buzzer is disconnected.
I understand you want to know where the buzzer switch is located on your Frigidaire dryer, model# CRER5700AS1. If your particular model dryer is equipped to turn off the buzzer, the switch will be located between the temperature knob and the start button, and named "Cycle Signal". If your dryer is not equipped with this feature, then there will not be an extra knob. Hope this is helpful.
The problem is most likely the over heating sensor thermostat located directly under the heating elements - The reason the over-heat safety thermostat sensor is tripping the warning buzzer is because either the cool air fan intake is obstructed with dust / dirt, or the fan motor stopped rotating, or the over-heating condition thermostat is defective, or over sensitive - Usually when the cool air intake is obstructed for any reason, the heating elements will glow brighter, and hotter without good air flow, and the elements may start to bow downwards closer to the over-heating safety thermostat - However, if the safety thermostat is defective, it can trigger the warning buzzer even though there may not be an over-heating condition / event present - The buzzer warning going off prematurely also occurred with my Holmes space heater - I checked the air flow first, and then the appliance tip-over switch second - Both were found functioning properly - It wasn't until I replaced the safety over-heating thermostat, did the buzzer stop going off moments after I plugged the space heater in an outlet.
The buzzer is inside the control switch area.Its about the size of 4 stacked 50 cent coins.Kill the power to the drier and then open the control panel and locate the buzzer.Remove the two wires; using electrical tape, you can tape up each wire end and then secure it out of the way. :?) DRRXR