Looking down the hole will not, in all likely hood, be informative if the well is 300ft. Given that you don't seem to be familiar with any of the details of submersible well pump operation I'd suggest you call a well driller who services pumps to investigate. Plumbers are generally not as knowledgable about some of the more exotic elements of pumping systems. Do you know the static water level (distance from the top of the well head to water) and recovery rate (GPM) of the well? Your driller should have given this info to whoever installed the pump so they could properly size the pump. I know from (expensive) personal experience this info is often not considered or misunderstood by pump installers and can lead to premature pump failures.The little box on the blue tank is the pressure switch. It turns the pump on when the pressure in the tank drops below a preset level usually 20-30 PSI and shuts it off when the pressure reachs a preset upper limit, usually 40-50 PSI. Many switches have a built-in safety feature which prevents the switch from closing if the pressure drops much below the cut-in pressure. The theory (and it works) is that if you pump your well dry this will protect the pump from running non-stop and burning itself up. If this happens the switch has to be manually reset to restore proper operation. If you have this type of switch you may determine if it's tripped off by removing the cover. Be careful its 220V inside. Cut power to the switch at the service panel if in doubt. The contacts will be visible. If they are open and the pressure gauge on the tank is below 20 the switch is tripped off and must be manuallly reset. There is a reset lever on the outside of the switch. If you've cut the power turn it back on. It's easier to see whats going on if you leave the cover off the switch but if you're not comfortable with a live 220V circuit a few inches away put it back on. Gently lift the lever until the contacts just close but no further. If you've put the cover back on you will hear them click and possibly see some sparks. DO NOT RAISE the lever any further or the switch will cut back out. HOLD the switch in this position and observe the pressure gauge on the pump. If there's water in the well and the pump is working you will see the gauge start to rise and probably hear water in the lines. Continue holding the switch until pressure reaches 30 PSI or so. The switch is now latched and you can release the reset lever. If that didn't fix it keep reading. You have the so called "three wire pump". and ostensibly a 1/2 HP pump if the control box is the proper unit for what's in the hole. I mentioned circuit breakers earlier. Did you check for them on or under the outside of the control box? On mine there are two push to reset buttons. If you find them and one or both "clicks" when you push it the breaker was tripped. There's a number of reasons they might trip. The control box contains the starting capacitors for your pump. You've indicated you have a 1/2HP unit in a 300' hole. That's a lot of head to pump with 1/2HP (What I said about plumbers and pumps). If the water level in your well falls to near the 300' level (drought/heavy usage) your pump may be struggling mightily to start against all of that load (head) and MIGHT trip a starting capacitor breaker. This is a transient condition that may well not reoccurr when the water level in the well recovers to a higher level In any event look for and check the breakers. If they were tripped reset them and go back to step one and repeat the procedures. If your still dry keep reading. If you have an amp meter check the current draw. Use a clamp-on type around ONE of the wires to the pump. If you have the safety cutoff pressure switch you will need to enlist the aid of a helper to hold the pressure switch closed while you take your current measurements. Be quick - do not run the pump more than a minute or so if you don't get pressure. The nameplate on the control box should have a couple of current numbers stamped on it. One is startup draw, the other is run draw. If you have a current draw it should be pretty close to the numbers on the box. Over current numbers indicate an overloaded or malfunctioning pump. In either event it probably has to come out of the hole for inspection, repair and/or replacement. No current indicates a malfunctioning control box or pump. The box is much easier and cheaper. If after all of this you have what appears to be a running pump and no pressure you may have a frozen line or you may have a leak. If your pump is on plastic pipe the torquing action of the pump on the line can cause it to rub on the side of the well and abrade a hole in it over time. Most platic pipe is installed with spacers attached to it to prevent this but.... Also the maximum pumping depth for plastic pipe is 300'. The head pressure at 300' exceeds the bursting pressure of plastic pipe. This confuses the heck out of plumbers who have hung pumps on plastic in 600' holes with no problem. The key is how much HEAD are you pumping, not the depth of the hole. Head is the distance you have to RAISE the water above the current water level in the hole. If the hole's 600' deep but the water level in the hole is 500' you are only pumping 100' of head and you have no problem. Let the water level drop to 100' and you are now pumping (only briefly on plastic ;-) 500' of head and that pipe will look like someone shot a 30-30 through it about 6" above the pump outlet. HTH, Dan
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