Question about Honeywell Electronic Programmable Heat/Cool Thermostat - CT3300A100 Heater

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Air conditioning will not turn on

The air conditioning unit outside is <2 years old. The thermostat on the wall has power, as does the entire house. All circuit breakers are on. The light for energy saver comes on, but will not turn on the air conditioning.

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Look for a leak in the system, this is because, if you have a leak there is a low pressure switch that prevents the compressor to turn on when there is low or no refrigerant pressure.
Also, perform a pressure check, this is about 68.5 psi and 70 psi with the system and compressor running.

Posted on Aug 15, 2008

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I am not understanding exactly what is happening with your unit. You say it only runs for 4 hours a day and then say that after 4 hours the outside unit shut off. But you don't describe the condition of the outside unit! Is there ice on your outside unit after it runs for four hours or is it so hot that the housing would fry an egg? Since it works for four hours and then stops working, I would guess that ice forms on the condenser grill which tells the thermostat that your air is much colder than it actually is. Then it takes time for the ice to melt off again. Am I close? If so this condition is usually caused by your unit being low on freon making everything work harder. But it could also mean that you have a leak in the system somewhere. But it shouldn't be much of a leak or it wouldn't run for the 4 hours.
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