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Compressor on window A/C unit runs continuously regardless of mode, temp setting

Compressor on window A/C unit runs continuously regardless of mode, temp setting

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  #1  
Old 06-17-15, 06:16 AM
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Compressor on window A/C unit runs continuously regardless of mode, temp setting

Have a large (24K BTU) window (actually thru-the-wall) A/C unit which has worked great past several years. Few days ago the condensor coil was frozen over. Unlpugged unit and let thaw dry out overnight. Next day same problem. Thought cond coil might be "dirty" so pulled unit and thoroughly cleaned both the cond and evap coils. Reinstalled, but same problem. What did notice is that when plugged unit back in the compressor immediately came on and never shut off. Compressor continued to run even when set temp to max 85 degrees or changed mode from cool to fan or even hit the power button; only way to stop compressor (and fan) from running was to physically pull the plug.
 
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Old 06-17-15, 07:52 AM
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Low freon can cause coil frozen (low fan speed or dirty coil also) . you may have a small leak. Not sure the unit has a recharge valve or not. Most window units don't have one. The 'non-stop' is a different problem. It is not worth to fix it, time to get a new one.
 
  #3  
Old 06-17-15, 06:33 PM
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Welcome to forums.

It sounds like the compressor control relay is burned/stuck on. If the compressor doesn't shut off then the coil will ice over.

Since this is a 24k thru the wall unit it may be cost effective to repair due to the high replacement cost.

A make and model would be required for more information.
 
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