Heating, Air Conditioning, Fridge, HVAC/air conditioning unit

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Question
I can only get the air to come on by pressing the
Contactor in the unit is just air its in a mobile home
It has a seperate furnace and there is a thermostat
For each one

Answer
Jeremy,

If you have to press the contactor in manually and the compressor along with the outdoor fan come on, chances a safety control tripped, such as a high pressure switch ( some high pressure refrigerant controls are manual resettable, if your system has a manual resettable high pressure ) or possible is your low pressure refrigerant control opened due to a lack of refrigerant in your system. The low pressure switch typically are automatic resettable. Again if your system has a LPC. You can bypass the thermostat by jumping the R terminal at the t-stat to Y to G , when you tie these three wire together your blower fan and the compressor and outdoor fan should come on, if they do and it cools your house ,chances are you have a bad t-stat ,if the outdoor unit does not come on ( talking a two piece system ) the chances it's the LPC or possible the HPC. Look at the wiring diagram to see what control is in series with the contractor. When was the last time you had a Preventive Maintaince check on your A/C ?  

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Joe

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40+ years diversified experience.An HVAC/Refrigeration Self Employed Contractor since 1986. NATE Certifield. Answer questions pertaining to Residential and Commercial Air Conditioning , Warm Air Heating, Heat Pump systems.Mechanical and Electrical troubleshooting of these systems.Be as detailed as possible when describing problem.Packaged unit or split systems.No appliance questions.

Experience

Installation and Troubleshooting, Mechanical and Electrical, in following areas, Refrigeration ( Walk In and Reach In Coolers and Freezers ) Commercial Roof Top and Packaged Heating/Cooling ( Natural Gas,Propane, Electric, and Heat Pumps ) Computer Room Air Conditoning Systems,Commercial Residential Packaged and Split Systems Air Conditoning and Heat Pumps.Warm Air Oil , Natural and Propane Gas Heating systems.

Education/Credentials
Graduated from Private Technical School in 1975. An HVAC/Refrigeration Contractor . Have Unlimited Heating/Piping and Cooling Contractor License.Limited Sheetmetal Contractors License.NATE Certifield. York Certifield Master Heat Pump Technician 1986. Served 33 years combination Active Duty Air Force , Air Force Reserves and Air National Guard in the HVAC/Refrigeration Shop/Mechanical Shop. Troubleshooting/Installing HVAC/Refrigeration Equiptment Worldwide. Retiring in 2003 as a Senior NCO ,and a Mechanical Superintendent.

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