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Re: I have an older unit need to know what the top knob...
One of the knobs controls fan speeds, cooling speeds and an off position. Center knob controls temperature and bottom knob more than likely controls air exchange. As for the front cover it would depend on the units age as to if it would be available.
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Without the Model Number, it's hard to know what knob fits your model. However, the link below, may provide some help. But, having the Model Number would be a bulls eye. Remove the front of the AC unit. There may be a manufacturer's data plate inside, which would provide the model number.
The unit needs to be tilted down 1/4/" to 1/2" on the outside of the window. Also check the drain pan's drain hole, under the unit (outside the window) for clogs. Doing all of this should solve the problem.
If this unit has the old style control with the knob instead of the digital control panel then I would suspect this first. This is the first component to fail on these units. I have replaced two already and the kit has good instructions and all components. Takes approximately an hour to do and mount the new sensors. (The transformer is hidden beneath the sheetmetal just below the control board). You should be able to order this kit through any appliance parts store for around 175 dollars versus almost 800 dollars for a new PTAC. Hope this is helpful.
for using FixYa. The cause of not cooling can be Drain, Sensor or Electric
Control might have gone bad. First of all you’ll need to check that the condensation
drain is not clogged and is working fine. Also check that the thermostat sensor
behind the control panel has not gone bad. The sensor should not be touching
the coil but instead it should be near to it. Please check and adjust it. The
thermostat sensor measures the temperature of incoming air into the evaporative
coil. Due to malfunction of the sensor the AC will not cool normally. As the
ACs are turned on and off frequently the fan controls and compressor may also
go bad. Please also check that there is no corroded wire. Please do accept the
solution if the issue is resolved or post a comment for further assistance. Thanks Rylee
The adjustment knob on the unit does not turn down how do you get the knobs off? Can we replace the control unit with one that is touch control? Could the problem of it not turning down be the thermostat? It is an Amana PTC153A35AD wall unit.