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On my honeywell thermostat cool on keeps on flashing but ac dosent come on

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On a Honeywell thermostat the flashing means that the system is in a delay to turn on the compressor. This is used to protect the compressor from coming on and off too often. The normal delay is about 5 minutes. After that the system should come on. If not there is s problem.

In order to help us help you we will need a little more information. What happens either at the inside unit or at the outside unit after the thermostat stops flashing "Cool"? Any fans come on? Do you hear a "KLUNK"? Any sparks? Please let us know so we can help.

Posted on Nov 20, 2011

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  • Darrell Smith Aug 04, 2013

    I am not seeing any fans come on on the outside unit, and the thermostat stops blinking "cool on" and displays a constant "cool on".

  • LeRoy Heasley Dec 13, 2013

    Sounds like the outside contactor is bad may need to carfully push in contacts manually with a screwdriver - if fan & compressor starts you may have a bad coil on the contactor - replace it .

  • barry
    barry Aug 22, 2019

    Same issue here.. AC always started up immediately upon lowering temp. Now suddenly, a delay of 3-5 min. happens before the ac starts up. Then it cools normally. What changed ?? Clues ??

  • barry
    barry Aug 22, 2019

    Does the Honeywell thermostat have a delay setting in it's software ???

  • Akilah Augustus Oct 30, 2019

    fans on changed battery but cool on still blinking

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Still nothing happening can hear a buzzing see flashing 75 cool on help

Posted on Mar 01, 2016

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No sparks. Just not coming on

Posted on Aug 27, 2015

  • LeRoy Heasley Mar 05, 2016

    Shut off the Breaker inside the house replace fuses or have them tested at the Hardware, and check and see if the contactor on the outside condensing unit has pulled in when calling for cooling...

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