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High head pressure, normal suction pressure? what r some things i can check for?

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Dirty condenser or slow or not running condenser fan. What are the pressures?

Posted on Jun 28, 2009

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Get out there and shut off the power to the Condenser. Pull the shroud off (or all the sheet metal) and clean the fins of the condenser coil inside and out, do this once a year. Use normal water hose pressure, watch that you do not get to close so as to not bent the fins, and be careful of the electrical parts, let it dry before restart.Watch out when you cut grass around it, its best to cut grass with the a/c off, the fan sucks air through the coils, from outside to inside, up out the top. If you call me to do it I will bill you $92.50. Save your money, take your time. Be careful!!!!

Posted on Jun 28, 2009


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Noma a/c cq120 makes noise in compressor area and casing is hot to touch. Is compressor going? Is it worth to repair or buy new. I'm guessing this unit is 4 years old or more

Possible Causes There are several reasons for a compressor to run too hot, including high compression ratio, high return gas temperatures, and lack of external cooling.High compression ratios are the result of either lower than normal suction pressures or higher than normal discharge pressures. Changes in suction pressure will affect the compression ratio more rapidly than changes in the discharge pressure. For this reason, it is important to keep the suction pressure at its highest possible value.
Causes of low suction pressure can include incorrect sizing of components, misadjusted or defective metering devices (TXVs), loss of refrigerant charge, plugged driers or strainers, and excessive suction line pressure drop.
Although not as sensitive to change as the suction pressure, the discharge pressure can still greatly affect the compression ratio. Keeping the discharge pressure within normal operating conditions is still important.
Causes of high discharge pressure can include dirty condensing coils, undersized discharge line, a blockage or recirculation of condenser air, erratic condenser fan operation, refrigerant overcharge, noncondensibles in the system, and an undersized condenser.
Many larger refrigeration systems with electronic controllers will automatically monitor the temperature of the discharge line and will send out an alarm to alert the owner or service contractor of a potential problem. Regardless of how the discharge line temperature is monitored, it should always be checked as part of any service to a refrigeration system.
A technician should also check the discharge line temperature within 6 inches from the outlet of the compressor. Any temperature above 225 degrees should be investigated and the cause found and repaired.

Jul 26, 2017 | Refrigerators

1 Answer

Safe switch shuts unit off at 425psi. what could be the problem?

Most 410-a Units will work at a vapor pressure of 125-140 suction, the normal head pressures range from 300-425, First thing i would do is get a water hose and make sure the condenser coils are clean, which affects your head pressure. Also make sure the condenser fan motor is spinning at a speed that seems normal and that your feeling good heat come out of it. And of course the normal clean filter check and make sure your evaporator coils are clean as well.
Hope this helps.

I’m happy to help further over the phone at

Oct 28, 2014 | Heating & Cooling

1 Answer

Above 78F no longer works gives heat head pressure is 300 and slightly above while low side varies bet 45 and 55 psi,noise in the return. i have about 85 feet of coil run 3/8 high side and 3/4 return from...

Your head pressure is a little high, depending on the ambient temp and your suction pressure is a little low. The suction pressure should be around 68 psig, the equivalent of a 40 degree coil. You can try adding a little refrigerant, check your compressor amp draw. If head pressure keeps going up and suction doesn't come up you may have a restricted metering device or filter dryer

Jul 17, 2011 | Goodman Heating & Cooling

2 Answers

High suction press (98psi), normal head press (140psi); full sight glass;low super heat (10 degrees);normal subcooling (13 degrees) new txv, new evaporator, new condensing unit 70 degree air from vents ...

lower fan speed.....and double check head pressure, sounds very low!!! should be around 250-275.....also make sure the return air grill is large enough.

Aug 09, 2010 | Goodman CLQ36AR49 Air Conditioner

1 Answer

How do you check to see if the high side is leaking back into the low side on a scroll compressor suction pressure is 90psi R-22 suction line is warm but not hot

90 psi is very high for R22....low for R410 refrigerant. If leaking by the head pressure and suction pressure will be close to to the same reading

May 10, 2010 | Heating & Cooling

1 Answer

A/c high head pressure low suction

Hi, High head and a low suction pressure can indicate a couple of different things. One, condenser coil very dirty and needs to be washed very well. This will bring your head pressure down but let it run back up to normal engine temperatures. If the head is ok after you clean it, and suction is even lower, you may still be low on charge. If the system is over charged will cause this problem. You may want to clean coil, evacuate unit, and weight in your charge. Charge is critical on a auto a/c. You may also have a restriction in the filter drier or site glass. Go through the basics first. Suction should run about 18 p.s.i. Head will run about 27*F over ambient.If you are running R-12 or 134-A, the pressures will be close on your gauges. Go by your scale on the inner part of your gauge which is temperature. So, for R-12 with an outdoor temp of 90 degrees, your head will be about 150 p. s. i. Remember, the charge is critical. Good luck,

Feb 07, 2010 | 1994 Jeep Wrangler

1 Answer

How to tell if you have a bad suction valve for ac compressor?

Hey there. First question I have is if you have a heat pump or straight ac. Straight ac is easy to diagnose. Your suction pressure will be high, your head pressure will be lower, not sure how clean your condenser coils are so its hard to say how high. Your amp draw on your compressor will be lower than normal. Also, when looking at the suction pressures, you have to keep in mind what temp the air hitting the evap coil is. If it is warm, that will make your suction pressure go up. Another way to check the vavles is to hold the suction line at the compressor when you shut it off. If the temp goes up the second you shut it off, this tells you the hot gas is leaking through your suction valves. You can also try to pump the system down, then shut it off and see how fast the pressure builds back up, this will give you and idea how fast it is leaking through. Let me know if you need any thing else, I'll be here.

Jun 26, 2009 | Hussmann Freezer 12 Facing Straight Glass...

1 Answer

A/c low pressure is to high

The reason you have high suction is probaly due to contamination in you a/c system. To clarify contamination, I mean water, other gases, or anything else, there only two things that should be in your a/c system, refrigerant and oil, anything else is a problem and will change your suction pressure.

If you can prove these items are true, then you need to examine that your condensor is cooling and condensing the high pressure gas, the tev is working correctly, and your high pressure is normal, and cooling is excellant.

Jun 24, 2009 | 2002 Oldsmobile Intrigue

1 Answer

Possible restricted drier

Before you start checking pressures, you need to make sure that the unit is clean inside and out. You also need to know what the ambient temp is outside so you know what the pressures should read. Without this information, your info is useless to me. You need to know what your saturation temp is to determine if the head pressure is too high or too low. If the outside unit is dirty, you will have a high head pressure and low suction pressure. If the inside is dirty, you will have a high suction and a normal to low head. My advice to you is to clean first and then start checking temps and pressures. Otherwise you are spinning your wheels.

Mar 31, 2009 | Heating & Cooling

1 Answer

Extremely high head and suction pressures

disconnect the blower and turn on the ac.see if the coil frosts evenly.when you had the system open,you should have changed the liquid line drier.

Jul 29, 2008 | Heating & Cooling

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