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The compressor cuts off at a low pressure level automatically? but switches of and on without problems

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  • Robert Sabino May 11, 2010

    tank pressure or regulated pressure?

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Try adjusting your regulator

Posted on Jul 19, 2009

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1999 national surfside motorhome no power to lock the compressor so it turns


have an accredited ac specialist shop check the gas pressures as if there is a leak in the system the low pressure switch will turn of the power to the compressor clutch and similarly, if the head pressure of the compressor is too high the power will be cut off
most problems with ac systems is leaking gas or excessive gas levels introduced by DIY persons

Jul 29, 2015 | Cars & Trucks

1 Answer

WHY DOES A SM75 INGERSOLL RAND COMPRESSOR CUT OUT ON LOW PRESSURE OIL


Low oil pressure. Are you adding a lot of oil. Have you check the oil level. Switch could also be bad.

Dec 08, 2014 | Ingersoll Rand Air Tools & Compressors

1 Answer

My ac is blowing hot air. I've checked the gas and it's full. The compressor seems to cut on and off about every 10-15 sec. Do I need a new compressor or do I have some sort of fault switch? Any...


Hello, You need to check how much Low end pressure you have. The Low pressure cutoff switch will disconnect the compressor if the pressure is too low. The high end pressure switch will do the same thing for extreme pressure.

Sometimes the Low pressure switch will get weak and cut off the system too early. Just change this switch which will come out with only a slight puff of Freon being lost. You can jump the connector with a U shaped wire and bypass the Low pressure cutoff switch. If the compressor works better and does not cut out, it can still be low on Freon or have a bad Low pressure switch.

However, if the compressor cuts out a Second time with the Low pressure switch bypassed, the system is probably overcharged and the HIGH pressure switch is cutting off the compressor. You need to purge some Freon out of the system if High pressure is indicated.

Where it gets tricky is the Compressor will compress both Freon and Atmospheric air. Your efficency drops when the Freon is displaced by Atmospheric air. You will need to find the leak in the system which is allowing Freon to leak and outside air to enter the system. You will get a pressure reading with any gas in the lines.

There are Leak detectors and sealers for the system. I hope you just have a bad low pressure switch which is the easiest solution.

Jun 25, 2011 | Ford F-150 Cars & Trucks

1 Answer

Ac compressor goes off and on


You either have a faulty Low Pressure Cut-Off Switch, or you are low on Freon. Have you freon checked, if the freon level is fine replace the Low Pressure Cut-Off Switch.

Mar 27, 2011 | 2001 Mazda Tribute

1 Answer

1997 jetta ac works for one minute then warm air blows


check the refrigerant level. The compressor is running until the low pressure or high pressure switch switch cuts it off.

Running the unit without enough refrigerant will damage the compressor because the lubricating oil is dissolved in the refrigerant. This is the reason for the low pressure switch cut off--to protect the compressor from damage.

If pressure gets too high, the compressor seals will blow. Thus the reason for the high pressure switch. Too much refrigerant or too much air in the system (due to a leak) will cause high pressures.

If refrigerant level appears to be correct, then suspect trapped air from a leak causing a high pressure cut-off. If refrigerant is low, suspect a leak causing a low pressure cut-off.

Mar 02, 2011 | Volkswagen Jetta Cars & Trucks

1 Answer

Need to set low level on my compressor


That would depend on the type of pressure control switch it had on it, but all of the ones I've ever seen have it near the high pressure adjuster under the pressure switch cover- VERY HIGH VOLTAGES- RISK OF INJURY OR DEATH- UNDER PRESSURE SWITCH COVER WITH UNIT STILL CONNECTED TO POWER-

On the common switch used (A condore mdr 5) the differential is adjusted by DEPRESSING the nob & turning it.

On MDR 4 the adjuster is directly behind the high pressure adjuster. it is a flat bladed screw attached to a spring-screw in to increase cut in pressure.

You can also get pressure switches with a higher cut in pressure.
In Australia from a company called Ross Brown Sales in N.S.W

Hope this helps
Regards Andrew

Jul 17, 2010 | Ingersoll Rand Type 30 Fully Packaged Ir...

1 Answer

24ABR348A0031010 compressor starts then stops. Carrier 4 ton R22 unit. Worked great, then fan runs all the time. Compressor will start for less than a minute, then stop. Basically compressor will not stay...


Hello RR Hard start can't hurt BUT dosen't sound like the problem.Do you have a scroll compressor?They don't need a kit.Does it start every time?It could be short cycling on LOW PRESSURE SWITCH.If the unit is (pumping down) during the run time you have a restriction in the system.Make sure the service valves are open ,do you have a filter dryer colgging up or a bad TXV valve also could cause short run times.20-30 PSI the switch cuts out.

Jul 15, 2010 | Carrier 38BRC036 Air Conditioner

2 Answers

Why does my compreeor switch release the air after reaching the required pressure instead of holding the air at the required pressure??? I've just purchased and fitted a new automatic cut off switch to my...


There are two valves in play here. There is a relief valve that opens when the motor kicks off to release the pressure in the compressor itself. That is normal, and is required so that the motor can restart next time without having to overcome that pressure. The other valve is the problem. It is a reed valve between the compressor and the tank. This valve's job is to prevent the air in the tank from returning to the compressor. Think of it as a ratchet for the air. It is this reed valve that has failed.

May 27, 2010 | Northern Industrial 2 Hp Twin Tank...

2 Answers

I have a 1996 geo tracker I cant get the compressor to run I have relpaced the compressor relay which dosent help. freon is ok compressor cluch kicks in when direct wired.


does the compressor run when bypass the compressor thermal cutout switch on the compressor? here is the part number and a picture.
also does it run when u bypass/jump the compressor cycling switch? it is located in the low side of the sytem, thios is the line that is the larger of the two, hwere is the part # and picture.

1. compressure cutout switch (3 diff ones used)
FOUR SEASONS Part # 35756
Compressor Mounted Cut-Out Switch; 1 Term White
type two
FOUR SEASONS Part # 35973
Compressor Mounted Cut-Out Switch; 2 Term; Blue or Green; Low Pressure
type 3
FOUR SEASONS Part # 35970
Compressor Mounted Cut-Out Switch; 2 Term; Yellow

d2d2a20.jpgthis is type one and two, two wires.

next is type 3 one wire.
06d325f.jpg Next is the low side compressor cycling switch, most common problem.

ACDELCO Part # 155606 {#96069320}
SWITCH,A/C CYCLING

2c15c22.jpg

Nov 02, 2009 | 1996 Geo Tracker 2 Door

2 Answers

Compressor seems to cycle on and off 2005 nissan maxima


For protection of your compressor the system has a low pressure cut-out switch that turns the compressor off when pressure is too low (normally due to insufficient charge). This cycling on/off indicates low freon level. Charge the system and you'll be OK.

Jun 29, 2009 | 2005 Nissan Maxima

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