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A water pump pressure switch may need a reset after the system loses pressure, the pump runs dry, or power is interrupted. On many well and rainwater pump systems, resetting the switch means restoring power and using a small reset lever until the pump can rebuild pressure.
Not every pressure switch has a reset lever. Some switches reset automatically. Others have tripped because of a real problem, such as an empty tank, blocked line, failed pump, low air charge in a pressure tank, or electrical fault.
Before resetting anything, turn off electrical power and find out why the pressure dropped.
What a Water Pump Pressure Switch Does
A pressure switch turns a pump on and off based on water pressure.
A typical pressure system includes:
- A water pump
- A pressure switch
- A pressure tank
- A pressure gauge
- Pipes and valves
When pressure falls to the switch's cut-in pressure, the switch starts the pump. When pressure reaches the cut-out pressure, the switch stops the pump.
For example, a system may be designed to start at one pressure and stop at a higher pressure. The exact settings depend on the pump, tank, plumbing, and switch.
Some pressure switches also include a low-pressure safety feature. If pressure falls far below normal, the switch shuts the pump off instead of allowing it to keep running.
This can help protect a pump when a rainwater tank, cistern, or well runs out of water.
Check Why the Pressure Switch Tripped
Do not keep resetting a pressure switch without finding the cause.
Common reasons include:
- The rainwater tank or cistern is empty
- A well has temporarily run low
- A valve is closed
- A pipe is blocked
- A suction line has lost its prime
- A filter is badly clogged
- A pipe or fitting is leaking
- The pump cannot build enough pressure
- The pressure tank has a problem
- The pump has lost electrical power
- The pressure switch contacts or wiring are damaged
If the pump cannot receive water, repeated resets can overheat or damage it.
Turn Off Power Before Inspecting the Switch
A pressure switch normally contains exposed electrical terminals under its cover.
Turn off the pump circuit at the breaker or disconnect before removing the pressure-switch cover.
Do not rely only on a nearby wall switch.
If you are not comfortable checking electrical equipment, leave the cover in place and call a qualified electrician or pump technician.
Water and damaged electrical equipment are a dangerous combination. Do not work on a switch that is wet, flooded, badly corroded, burned, or melted.
How to Reset a Pressure Switch With a Reset Lever
Some low-pressure-cutoff switches have a small lever on the side.
The exact lever positions vary by switch, so check the manufacturer's instructions when available.
1. Make Sure Water Is Available
Check the water source before restarting the pump.
For a rainwater system, confirm that the storage tank contains enough water to cover the pump intake.
For a surface pump, also check that the suction line is filled and properly primed if the pump design requires priming.
Do not reset a pump that has no water supply.
2. Check the Main Valves
Make sure valves needed for normal pump operation are open.
Look especially at:
- Tank outlet valves
- Pump inlet valves
- Pump discharge valves
- Isolation valves near filters
A closed valve can prevent the pump from receiving water or sending water into the system.
3. Restore Electrical Power
Once the system has water and the plumbing path is open, restore power.
Keep hands away from open electrical contacts.
If you removed the pressure-switch cover for inspection, reinstall it before operating the system unless the manufacturer specifically requires another procedure.
4. Move the Reset Lever to the Start Position
Move the lever to the manufacturer's reset or start position.
On many switches, you must hold the lever there while the pump starts building pressure.
Do not force the lever.
If the lever does not move normally, stop and inspect the switch instructions or have the system serviced.
5. Hold the Lever Until Pressure Rises
Watch the pressure gauge.
Once the pump raises pressure enough for the pressure switch to remain engaged, release the lever slowly.
The pump should continue running on its own.
If releasing the lever immediately stops the pump, the system may not yet have reached the switch's required pressure.
6. Let the Pump Reach Normal Shutoff Pressure
Allow the pump to run while watching the pressure gauge.
The pressure should rise steadily until the switch reaches its normal cut-out point and shuts the pump off.
Do not leave the system unattended during this test.
Stop the pump if:
- Pressure does not rise
- The pump makes unusual noises
- Water stops flowing
- The pump becomes unusually hot
- Pipes start leaking
- The pressure gauge behaves abnormally
These signs can point to a pump, plumbing, pressure tank, or water-supply problem rather than a simple pressure-switch reset.
What If the Pressure Switch Has No Reset Lever?
Many pressure switches do not have a manual reset feature.
A standard pressure switch normally starts the pump automatically when system pressure falls to its cut-in setting.
If that type of switch is not starting the pump, the problem may involve:
- No electrical power
- A failed pressure switch
- Burned electrical contacts
- A clogged pressure-sensing port
- A failed pump motor
- A motor overload
- Broken wiring
- Incorrect system pressure
Cycling the breaker off and back on may reset some pump motor protection devices, but it will not repair a failed pressure switch or pump.
Do not repeatedly cycle the breaker if the pump keeps tripping.
Check the Pressure Gauge
The pressure gauge is one of the simplest ways to understand what the system is doing.
When the pump runs, system pressure should normally rise.
If the pump runs but the gauge stays near zero, possible causes include:
- No water reaching the pump
- Lost pump prime
- Air entering the suction line
- A damaged pump
- A major leak
- A closed valve
- A failed pressure gauge
Understanding switch faults behind irregular pump operation helps assess lift capacity with safeguards against lost prime.
If pressure rises but never reaches the shutoff setting, the pump may not be able to produce the required pressure.
A pressure switch cannot fix that problem by itself.
Check the Pressure Tank
Many pump systems use a pressure tank containing water and compressed air.
The air cushion helps maintain pressure and reduces how often the pump starts.
A badly waterlogged or incorrectly charged pressure tank can cause the pump to cycle rapidly.
Short cycling means the pump starts and stops repeatedly within a short period.
Possible symptoms include:
- Very frequent pump starts
- Rapid pressure changes
- Water pressure that surges
- Pressure-switch contacts opening and closing often
Checking the tank's air charge usually requires shutting off the pump and removing water pressure from the system.
The correct air setting depends on the pressure-switch cut-in setting and the tank manufacturer's instructions. Do not guess at the required pressure.
Do Not Adjust the Pressure Switch Just to Reset It
Resetting and adjusting are different jobs.
The adjustment nuts or screws inside many pressure switches change the operating pressures.
Changing them without understanding the system can create problems.
An incorrect setting may:
- Make the pump run continuously
- Exceed the pump's ability to build pressure
- Cause rapid cycling
- Produce poor water pressure
- Put extra stress on pipes or equipment
If the system worked correctly before the shutdown, changing the pressure settings usually should not be your first response.
Return the system to normal operation first and find the reason it lost pressure.
Check for a Lost Pump Prime
Surface pumps often need water inside the pump housing and suction pipe before they can lift water.
If air enters the suction side, the pump may run without moving enough water to rebuild pressure.
This can happen after:
- A storage tank runs empty
- A suction fitting leaks
- A foot valve or check valve fails
- Maintenance opens the suction line
- The system is drained for winter
Follow the pump manufacturer's priming instructions.
Do not allow a pump that requires water for cooling or lubrication to run dry while waiting for it to prime.
Check Filters and Strainers
Rainwater systems often have screens, strainers, sediment filters, or other filtration before or after the pump.
A clogged filter can reduce flow enough to affect pump performance.
Check components that are safe and accessible, including:
- Tank outlet screens
- Pump inlet strainers
- Sediment filters
- Inline screens
- Irrigation filters
Clean or replace them according to their manufacturer's instructions.
Make sure any filter housing is properly depressurized before opening it.
When a Pressure Switch Keeps Needing a Reset
A pressure switch that repeatedly trips is usually reacting to another problem.
For a rainwater system, first check whether the stored water level is falling below the pump intake.
You may also have:
- A restricted inlet
- A suction leak
- A failing check valve
- An undersized pipe
- A clogged filter
- A damaged pressure tank
- A worn pump
- A leak downstream
- A faulty pressure switch
The pressure switch should not normally need frequent manual resets during everyday use.
What to Do If the Pump Will Not Build Pressure
Turn the pump off if pressure is not rising normally.
Then check the water path from the source to the fixtures.
A simple order is:
- Confirm water is available.
- Confirm the pump inlet is submerged or properly supplied.
- Check whether the pump needs priming.
- Confirm important valves are open.
- Check filters and strainers.
- Look for visible leaks.
- Check the pressure gauge.
- Inspect the pressure tank if you know how to do so safely.
If those checks do not identify the problem, the pump may need professional diagnosis.
When to Call a Professional
Stop troubleshooting and call a qualified pump technician or electrician if you find:
- Burned or melted pressure-switch parts
- Damaged electrical wiring
- Repeated breaker trips
- Water inside electrical components
- A pump that will not start
- A pump that hums without running
- Pressure that rises beyond the expected shutoff point
- A pump that runs continuously
- A switch that sparks excessively
- A system that repeatedly loses prime
- A pressure tank that appears damaged or unsafe
A pressure switch controls electrical power to the pump, so internal electrical repairs are not a good beginner DIY job.
Preventing Future Pressure-Switch Trips
The best prevention is to solve the reason pressure became too low.
For rainwater and cistern systems, useful safeguards may include:
- A low-water shutoff
- Dry-run protection
- A properly placed tank intake
- Routine filter cleaning
- Leak checks
- Correct pump sizing
- A properly sized pressure tank
Dry-run protection shuts the pump down when it is not receiving enough water.
This is especially useful where stored rainwater levels can change during dry weather.
It should complement the rest of the pump system rather than serve as a substitute for proper sizing, plumbing, and maintenance.
Frequently Asked Questions
Where is the reset button on a water pump pressure switch?
Many pressure switches do not have a reset button. Low-pressure-cutoff models often use a small reset lever instead. Check the switch label or manufacturer instructions before operating it.
Why does my pump stop when I release the reset lever?
The system may not have built enough pressure for the switch to stay engaged. Make sure the pump has water, is properly primed if required, and can build pressure. Do not keep holding the lever if the pump is running dry.
Can I reset a pressure switch by turning the breaker off and on?
Sometimes cycling power resets a motor overload or electronic control, but it does not necessarily reset a low-pressure pressure switch. A switch with a manual low-pressure cutoff may still require its reset lever.
Why does my pressure switch keep tripping?
Repeated trips can be caused by low water level, lost prime, clogged filters, suction leaks, pump problems, pressure-tank problems, or a failing pressure switch. Frequent resetting is a sign that the underlying problem needs attention.
Should I adjust the pressure-switch springs when the pump will not start?
Usually not. The adjustment springs change the pump's operating pressures. If the system worked before, first check water supply, power, valves, filters, priming, and the pressure tank.
Can an empty rainwater tank trip a pressure switch?
Yes. If the pump draws the tank below its intake, system pressure may collapse. A low-pressure-cutoff switch may then shut the pump down to help limit dry running.
Why is my pump running but the pressure gauge is not rising?
The pump may have lost prime, be drawing air, have a blocked inlet, lack enough water, or have a mechanical problem. A major leak or faulty gauge is also possible. Turn the pump off if it cannot build pressure normally.
