Have HVAC Questions? Ask an HVAC Expert for Answers
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What pattern is the light blinking?
OK does the outside fan come on then for the 3 minutes?
Yes if the unit is low on gas or out the unit will not allow it to start, for this issue you will need a tech to check it out as this is likely not a push button fix for what you have going on.
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The freon should never leak out, but often a slow leak develops on a system and can leak out over a year especially on units not used much. Now other things can cause this issue as well such as a bad control board on the outside unit too, so there are multiple issues that could cause your error.