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Pressure switch does not come on sometimes. - Plumbing

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What pressure switch are you talking about that does not come on all of the time. I need more information to help you.

Posted on Jun 07, 2014


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Posted on Jan 02, 2017


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Well Pump Problems The Well Pressure Switch

If you have a water well pump then you also have a well pump pressure switch that controls the well pump. This little device can be very confusing. It also is known by many names. These may include pressure switch, well pressure switch, well pump pressure switch, water well pressure switch, well tank pressure switch, and many other variations. All of them refer to the same part that controls the on and off function of the water well pump whether it is a submersible well pump, a deep well jet pump, or a shallow well jet pump.

Some the problems that are most common with the well pump pressure switch.

  1. The contacts burn out and fail to conduct the current through them to the well pump. If you see the contacts are very black or even not there then you definitely have to replace the pressure switch.
  2. The contacts weld together and keep the pump on continuously. Sometimes after getting worn and dirty the contacts on the well pressure switch will just stick right together and not release when the pressure builds and then the pump will not shut off. Even if you can release them with a screw driver, after turning the power off of coarse, they will just do it again, replace the pump switch.
  3. Dirt will sometimes plug up the little pipe nipple that goes down from the bottom of the well tank pressure switch and delay the action of the well pump. This can happen even on shallow or deep well pump that have the pressure switch mounted right on them or sense pressure through a small plastic tube. Take everything apart and clean out so that the water pressure to the pressure switch is accurate.

This should give you a basic guide to the common problems you may experience with your water well pressure switch.

Also note that some well pressure switches have a small lever on the side that will need to be held up for a minute or so to start the well pump. This is a low water cut off protection device that will keep the well pump off if it runs out of water in the well or if it loses prime for some reason. Hold the lever up part way for a bit till pressure starts to build in the well pump pressure tank and then it can be released.

on Dec 22, 2009 | Plumbing

1 Answer

Grundfos pump

It sounds like you have a bad pressure switch. I would also check the pre-charge pressure in the expansion tank. This needs to be 2lbs less then the "cut-in" pressure of the switch IE: 30-50 switch 28lbs air in pressure tank.

May 11, 2013 | Grundfos JPS4 1 HP Pressure Booster Pump

1 Answer

Tracer air conditioner blows cool only sometimes

It is very possible that the A/C is not engaging part of the time. It can be overcharged. You have 2 safety switches on the A/C system. A high pressure and a Low pressure.

Pressure inside the system is dependent on the background temperature where the car sits. This means the A/C does not have to be turned on for the switches to activate. Their job is to cut off power to the compressor, so when you start your car, the power to the compressor may already be switched off.

There are charts for filling the Freon system. For sake of conversation, lets' say the low pressure cuts off at 20psi and the high at 300psi. Those are the ratings for the respective switches. You have a low charge, say 25psi at 80 degrees outside temp. Overnight or a Cold front comes in and the outside temp is 70 degrees. The system drops to 19psi as the car sits. The compressor clutch will not get power. Also for the high switch, the car sits as outside temp goes to 100 degrees. The A/C pressure climbs to 325psi as the Freon expands, the compressor clutch will not get power.

This is why many instructions tell you to bypass the pressure switches to charge the system. Your switches are constantly working to keep the pressure between 30psi and 300psi. MODERATION is key here. The longer the compressor clutch stays engaged, the more cooling you will have.

So the car makers recommend a fixed amount of Freon for each Model of car. Volume capacity is different for the length of the hoses, the size of the condenser, the chamber inside the compressor. It all is calculated so they know how many LBs of Freon will fit in the space to produce a given pressure.

Most of the pressure switches can be changed without significant loss of Freon, just a puff when the switch is removed and replaced. I have replaced more low pressure switches than the highpressure. It is probably because the springs are much weaker on the low side.

Some major autoparts stores have tool loaner programs. Manifold gauges are used to read both pressure ranges. If you did not purge the system with an electric or air powered Vacuum pump, you may have water condensation forming ice in the lines.

I hope my solution helps you.

Sep 07, 2012 | 1993 Mercury Tracer

1 Answer

I have a whirlpool ultimate care II that won't fill with water it just starts agitating. Sometimes if you hold the load size switch in between load sizes it will start filling but you have to hold the...

The problem is quiet obvious and it is the water level pressure switch behind and connected to the load size switch knob. The pressure switch is stuck in the full position that's why the machine doesn't fill and it goes directly to agitate. Holding the load size switch in between load sizes releases the contacts from full position and allow the machine to fill as long as the switch is held on.

Disconnect power then release the console from the top of the cabinet depending on the model of your machine then pull forward and up on the console and lay it back on the hinges.



Behind and connected to the load size switch under the console is the water level pressure switch with a clear hose attached to it.

Remove the pressure hose from the pressure switch then reinstall the console and reconnect power. Start The pressBlow air forcefully into the pressure swic

Feb 10, 2011 | Whirlpool Ultimate Care II LSQ9549L Top...

1 Answer

Replaced pressure switch, ventor and unit still goes off on pressure switch. 3 flashes

Hello, check the small tubing that goes from the pressure switch to the inducer motor, sometimes it could be loose or blocked therfore not allowing the switch to close. Also, there could be some obstruction in the flue pipe preventing the switch from closing.

Jan 26, 2011 | Goodman GMS90703BXA Heater

1 Answer

Washing machine only fills half way on large setting. what is wrong?

that usually would be your pressure switch and or the dome at your tub is plugged. take the consol off to the left side you will see a component with a hose attached to it take the hose off the pressure switch and blow through it with the tub it clear can you blow through it? if yes then your dome is clear. replace the pressure switch and this should solve you problem. sometimes i blow through the pressure switch too and sometimes this fixes that problem.

May 10, 2010 | Amana ALW480DA Top Load Washer

1 Answer

Water doesn't fill to capacity

Washers have a water level sensor that consists of a plastic pipe that feeds a pressure switch that activates once the correct amount of water causes the air pressure in the pipe to activate the water level switch. The switch is normally adjustable but should be factory set only once. The plastic pipe does sometimes become clogged and could be cleaned.
I have found that in some instances the electrical contacts in the pressure switch burn and the pressure switch must be replaced.

Mar 15, 2010 | Dishwashers

1 Answer

I have a goodman gcs90703bxa flashes 3 times blowed in the pressure hoses went from 3-2 flashes what could be wrong?>

flash 3 is a blocked pressure hose. the switch is open. flash 2 is the pressure switch stucked closed. if you applied pressure to the swich you may have damaged it . It typically clogs on the Induced draft motor housing on the bard fitting that the hose from the pressure switch connects to. sometimes if you take a paper clip and **** it out. but never apply pressure or tools to the switch.

Jul 31, 2009 | Goodman Heating & Cooling

1 Answer

Karcher pressure washer won't start

Dear ralph_birtwi,
Most pressure washers when their gun is released, the machine stops automaticaly. This is done ny means of a control valve. When the gun is closed...pressure is built and the control valve moves and switches a micro switch off. In your case the micro switch is still closed in off position. Now this happens if a machine is left and stored with pressure in it., This control valve could get jammed and leaving the micro switch in off position. It could also stay in off position by sticking, due to incorrect chemical.
So the control valve or even called spill valve, must be renewed.
Sometimes a little lubrication with the right type of silicon grease will get the control valve working again. This job is sometimes delicate and better done by a qualified technician.

Apr 11, 2009 | Karcher K2.26 Electric Power Washer

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