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Honeywell st9400a screen keeps flashing on and off when in use

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


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.

Nov 20, 2011 | Honeywell Heating & Cooling

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My Honeywell Ademco 6160 Alpha Keypad Vista 10E low battery light keeps flashing even after I've change out????


The low battery light will stop flashing when the new battery you just installed become fully charged. It will take some time for the new battery to become fully charged.

Jun 06, 2011 | Honeywell Ademco 6160 Alpha Keypad Vista...

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Flashing snowflake on display


That is a Time delay normal to keep the condensing unit from turning of and on to fast really save the life of the equipment

Jun 16, 2009 | Honeywell Programmable Thermostat Heater

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