Okay, let's break down the situation and troubleshoot what's likely going on with your well pump system. Given the symptoms you've described, it seems like you have multiple problems compounding each other, and one likely led to the others.

Here's a step-by-step breakdown of potential issues and what to check



1. Control Box Rattling and No Pump Start (The Most Immediate Problem)



Likely Culprit: Failed Start Capacitor or Potential Relay Issue (in the Control Box). The rattling noise almost certainly indicates a problem inside the control box. Start Capacitor

This is the most common failure point. Its job is to give the motor a surge of power to get it spinning. If it's bad, the motor will hum or make noise but not turn. When the control box does start, the start capacitor will rattle. Start capacitors are known for failing over time, especially in harsh conditions.

Potential Relay

In some control boxes, a relay is used to switch the start capacitor in and out of the circuit. If this relay fails, it could also cause the motor not to start.

Troubleshooting the Control Box


Power Off



IMMEDIATELY DISCONNECT POWER to the well pump at the breaker! Working on electrical components without proper precautions is extremely dangerous.2. Open the Control Box

Carefully open the control box and inspect the components. Look for:

Visually Obvious Damage

Blown capacitor (bulging, leaking fluid), burnt wires, signs of arcing.

Loose Connections

Make sure all wires are securely connected to their terminals.3.

Test the Capacitor (If you are comfortable and competent with electrical testing and safety)



Discharge the Capacitor

Before testing, discharge the capacitor using a resistor.

This is crucial for safety, as capacitors can hold a dangerous charge even when disconnected from power. You can find instructions online for how to safely discharge a capacitor. Test with a Multimeter

Use a multimeter set to capacitance mode (if your meter has it) to check the capacitor's value. Compare the reading to the capacitance rating printed on the capacitor (e.g., "100 uF"). If the reading is significantly lower, the capacitor is likely bad.4.

Test the Relay (Advanced)

Testing a relay typically involves using a multimeter to check for continuity and proper operation of the relay coil and contacts. You'll need to understand the relay's wiring diagram. If you are not comfortable doing this it is best to reach out to a professional.5.

Replacement



Capacitor

If you've identified a bad capacitor, replace it with one of the exact same capacitance (uF) and voltage rating. Higher voltage is okay, but the capacitance must be the same.

Control Box

If you're uncomfortable working on the control box or the damage is extensive, it's best to replace the entire control box. Make sure you get a compatible replacement for your 1/2 HP, 230V pump.

2. Holding Tank Empty and Zero Pressure (The Initial Problem)



Possible Causes



Leak

The most likely cause for a system that was working fine. Check the well casing, pipes, fittings, pressure tank, and all plumbing connections for leaks. Even a small leak can eventually drain the tank.

Low Well Water Level

If the water level in your well has dropped below the pump intake, the pump won't be able to draw water. This can happen due to drought, increased water usage, or a problem with the well itself.

Pump Failure

The pump itself could have failed, but the capacitor or other control box problem is more likely, given the symptoms.

Troubleshooting



Check for Leaks

Thoroughly inspect all visible plumbing for leaks.

Listen at the Well Casing

When the pump should be running (after you've fixed the control box), listen at the well casing. If you hear the pump running but no water is being pumped, the water level in the well could be too low, or there could be a problem with the pump's impeller or check valve.

3. Pressure Switch (30/50) and Tank Pre-charge (28 psi)



Tank Pre-Charge

You've done the right thing by checking and adjusting the tank pre-charge. It should be set 2 PSI below the "cut-in" pressure of the pressure switch (30 psi in your case), so 28 psi is correct.

Pressure Switch Functionality

After addressing the other issues, you may need to inspect the pressure switch to confirm it's functioning properly. Sometimes they can fail. Use your multimeter to check the contacts when the system should be running. If the switch does not close when pressure is below 30psi, then you will need to replace it.

Steps to Take (in order)


SAFETY FIRST: DISCONNECT POWER TO THE WELL PUMP!2. Inspect the Control Box

Open the control box and visually inspect the components, particularly the capacitor and relay.3.

Test the Capacitor (If comfortable and safe)

Discharge and test the capacitor.4.

Replace or Repair the Control Box

Replace the capacitor or the entire control box, depending on what you find.5.

Restore Power

Carefully restore power to the well pump at the breaker.6.

Manually Engage Pressure Switch (Carefully)

If the pump doesn't start automatically, try manually engaging the pressure switch (if possible and safe) to see if the pump runs after the control box is fixed.7.

Monitor Pressure

Watch the pressure gauge to see if the pump starts pumping water and builds pressure in the tank.8.

Check for Leaks (Again)

With the system running (or trying to run), carefully check for leaks again.9.

Assess Well Water Level (If no water is being pumped)

If the pump is running but not pumping water, suspect a low well water level or a problem with the pump itself.10.

Pressure Switch

If system builds pressure but does not stop at 50psi or fails to start a below 30psi, then it will need replaced.

Important Considerations



Safety

Working with electricity and well systems can be dangerous. If you're not comfortable with any of these steps, hire a qualified electrician or well pump technician.



Well Water Level

If you suspect a low well water level, you may need to consult with a well drilling or service company to have the well inspected and potentially deepened.

Professional Help: If you've gone through these steps and still can't resolve the problem, it's best to call a professional. They have the expertise and tools to diagnose and repair complex well pump system issues.Good luck! Let me know if you have any other questions. Flag for review