Question about Heating & Cooling

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About to weeks ago my outside compessor and fan were not kicking on and the indoon furnace fan was running constantly i figured out were the voltage stoped and i reset the high pressure switch. the copressor kicked on right away. for about four or five days now the inside fan in the furnace runs consantly and the copressor keeps kicking on randomly as well as the copressor fan but it only stays on for 2 to 3 minutes then kicks off my thermostat never kicks off and the temp. inside my home never drops below 75. with some research i have a elimated some things. it's not the defrost cycle there is no heat from vents when it stops. theres one refrigerant line that does frost up quickly but it could be nothing. please help!!

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  • gturner5 May 03, 2010

    i just went outside and and trigered the contactor and it is a 1/4 in. or little smaller copper line that runs between the expansion valve and the expansion valve sensing bulb. its warmer today than yesterday outside so it did'nt frost imediatly but got very cold and after i released the contactor it continued to frost up the entire length or the copper line.

  • gturner5 May 03, 2010

    no and no to your questions.

    it frosted right away starting at the expansion vavle extending about 4 inches.

    if you dont mind what is flashing.

  • gturner5 May 03, 2010

    just to be completely clear all i need to have done is to recharge the freon by a qualifyed service tech.

    is this correct or is ther anything that could happen when it is charged that would identify the low freon as a secondary problem and not the primary and only problem

  • gturner5 May 03, 2010

    is there any chance that the refrigerant is leaking inside my house.

    i have recently ben in my basement alot trying to fix my dryer and i figured i would have smelled something.

  • gturner5 May 03, 2010

    this oil your talking about when it leaks is the oil noticable and does it leave a residue that does'nt go away after the oil dry's up?

  • gturner5 May 03, 2010



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Sorry you are having trouble, with summer coming on we will need the cooling.

Thank you for the details it helps a lot. I think we can safely eliminate the thermostat, the fuses, the controls from the furnace (air handler) and power to the condenser.

It sounds like we may have a problem with either high pressure or low pressure that is causing the entire condenser to turn off. Since you only had to reset the high pressure the one time I am suspecting our problem is on the low side. That is usually an indication that we are low on refrigerant. Can you tell me which line is the one that freezes up?

Posted on May 03, 2010

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  • Philip May 03, 2010

    If we are frosting that close to the thermal expansion valve it would most likely indicate a low charge. Without enough refrigerant in the system we are flashing too soon.

    Do you have refrigerant gauges and are you EPA certified?

  • Philip May 03, 2010


    Flashing is where liquid refrigerant (freon) turns to a gas. During this evaporation the maximum cooling takes place, the valve opening should be letting liquid flow down that small tube, but from what you are describing the liquid is 'flashing' or turning into a gas way too soon, meaning there is not enough liquid in the system.

    I hope that makes sense.

    The reason I am asking about gauges and certification is to cover myself. In the US you have to be certified to use refrigerant (freon).

    To check the amount of charge in the system you will need a set of gauges.

    Not sure how much further we can go here without them.

  • Philip May 03, 2010

    The signs point to a low charge, this can be easily verified with gauges on the unit.

    If it is low (which I am pretty confident it is), it may not be as simple as recharging or filling it up. To have a low system means the refrigerant has gone somewhere (leaked out).

    If the amount that is gone is small then they will most likely just recharge it and you are good to go without other repairs.

    If the amount that is gone is large they will have to find where it is leaking from and repair that leak then recharge it. If this is the case, it all depends on where the leaks is.

  • Philip May 03, 2010

    Yes, it could be leaking anywhere in the system. Refrigerant typically does not have a noticeable odor. The oil that accompanies the refrigerant usually has an odor that you will notice.

    If you have small leak that has leaked while the unit was off it would most likely not be detected by smell. If it were a larger leak that comes out when running you would be more likely to have oil with it.

  • Philip May 03, 2010

    Depending on the size of the leak it could leave a small amount of oil. If you find a joint in the tubing and it feels oily that could be an indication that the leak is there.


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