Question about Carrier 38CKC036 Air Conditioner

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Curious to know about high pressure switches

I was once told that a high pressure overload can be caused by low charge to a unit. I have never heard of such thing, can you please elaborate the details of a high pressure switch for me? Please email me at Timmmmy1978@yahoo.com.

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High pressure switch use to detect the high pressure in the system. It is use to protect the unit from high pressure during operation.

Posted on Aug 29, 2008

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Compressor after 10minutes stop but outdoor fan still working. Only 30psi and 8.2 ampere.what is cause of this problem for LG gold


It looks like you are low on refrigerant and low pressure switch is shutting the compressor down or it's shutting down on the thermal overload in the compressor. You need to have the unit charged.

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Is there a reset switch on Carrier airconditioner


No turn you termalsate to the off pos. Then to fan on. Them see if it goes off and then switch to cooling on the coldest sting if the fan in air handler shuts off before. The stat tells it to it might be kicking out on thermal overload bad motor. Check the condnsor fan for this to fans don't turn on unless they are told to by power going to a board or a relay low voltage control wires may be damaged clean the units pay a tension

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After turning the AC unit on roughly 10-15mins. outdoor unit turns off head unit still on


It sound like you have problem with compressor overheated. Make sure your is clean and correct amount of freon

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I have to push the red reset button about once a day on my outside unit. What can cause this?


Depends on what the reset button is for.

If it is a low pressure cut off then you are probably low on refrigerant or have a dirty inside evaporator coil or bad airflow across the evaporator coil.

If it is a high pressure cutoff then you have a bad condenser fan motor, dirty condenser coil or it is over charged with refrigerant.

If it is an electrical overload reset button then the unit is pulling too many amps or over heating due to refrigerant loss and/or dirty condenser coil.

I'd wash out the condenser coil, ensure that the condenser fan is running, make sure you have a clean filter inside and that the blower is operating properly. If those things are OK and it still pops that reset then call a service tech to look it over for you.

Jun 18, 2011 | Ruud Air Conditioners

1 Answer

I have a Rudd furnace and air conditioner. The air conditioner is not working. The external air conditioning unit will start and run for 15-30 seconds and then shut-off. It tries to do this about every...


Hi, and no they are not related, but act like they are. If the outdoor unit starts, fan and all, we call this short cycling on its pressure switch. You have 2 pressure switch's, one for low pressure as its low on freon, or high pressure where its overheating and shutting off on its head pressure switch. Unplug it at the box near the unit. Take a garden hose and wash your coil out real good, but not to flatten the aluminum fins on the coil. You can also use a solution of detergent and water to spray the coil down before washing if you can, but you don't have to to find out if it is the high pressure switch. If it continues to short cycle, then you have developed a small leak and lost enough freon to cause this problem. You will need to have it charged and leak checked if they determine how large of a leak it is. I am pretty sure from the amount of time it starts and stops, its low on gas. When the unit starts, the compressor will start to pump causing it to go into a vac on the low side gauge. When running on a full charge, it will be on about 64 p.s.i. at 95 degrees outdoors. If is low on gas/freon, it will pull down to around 20 p.s.i. which is the factory set point for the low pressure switch to kick off. The gauge will then start to rise and in seconds start up and repeat this again. This is what yours is doing now. Try washing the coil first, and turn it on. If it continues to short cycle, you will have to get it charged. If its 10 or more years old, it will take the R-22 freon. If newer, it may be the 410-A. Either way you cant buy it. I hope I have been of help to you. Please let me know.
Sincerely,
Shastalaker7, a/c Contractor

Jun 06, 2011 | Ruud Air Conditioners

1 Answer

We cleaned the coils outside. Now the compressor only stays on about 30 seconds and shuts off. It will come again in approximately 4 minutes. The fan outside and the blower inside stays on. We have a...


sounds like it's cycling on the high pressure cut-out switch. Note: it could be a low-pressure switch that is causing the cycling but most units (today) don't have low pressure switches. If your unit has either of these two switches it will (usually) be the high pressure switch, although it's possible it has the low pressure switch too. My guess is it only has a 'high pressure cut-out.'
I would seriously look at the coil again and make sure you've cleaned it real good.
Many Carrier Air Conditioners have what is called a SPLIT coil. If this is what you have you will need to (WITH ALL POWER OFF) disassemble the outside unit enough to where you can manually pull these coils apart (be careful - you just need to get a small gap between them) and wash IN BETWEEN the two coils.
Pretty difficult to do - but doable.
It's possible you have an overcharged unit - but unless you've recently had it charged I would not suspect this.
If it is not the high pressure switch - and 'you do have' a low pressure switch - chances are you're out of refrigerant and you will need a serviceperson to (a) fix the leak and (b) re-charge the unit

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1 Answer

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ok, on these units, if by high side line you mean the small tube going from outside to inside, that tube is actually on the low side, the metering device is in the outdoor unit. If you shut the unit down, let everything thaw then restart and find that small tube is freezing up right at the outdoor unit right away, my guess is its low on charge. I see that you put some in, make sure it is the right knid of refrigerant. they do not hold alot. Where is your suction pressure running. If you put 2 to 3 pounds with no change, you may have overcharged but that is telling you that there is a restriction in the line inside the outdoor unit, probably the filter if it has one, or the metering device itself. Let me know what you find.

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Unit will not come on at all has voltage to unit and to contactor?


Sounds like you lost the refrigerant charge. Low pressure switch will not let compressor run. Look for oil around the condenser tubes. If you find it, this is probably the leak source.

Jun 01, 2009 | Air Conditioners

1 Answer

5 ton goodman ac unit


You MUST WEIGH IN THE NEW CHARGE OF R-22. There should be a label on the side of the a/c unit that states what the factory charge was. This is only a starting point. Once you have the factory charge in the system, then turn on the unit and allow it to stabilize (5 min) . Check pressure on low side and check teperature on low side pipe. Temperature of pipe should be 8 to 15 degrees above what the boiling point of the refrigerant is for the current pressure you are reading. If the temperature is more than 15 degrees, add R-22 in 4oz increments allowing 5min in between each time you add until you are in the "zone". When you do this, your head pressure needs to be 225-250. if you need to cover the coil or block the outdoor fan to do this then do it. Hook up the vacuum pump and start over

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