Hayward Super Pump VS 700 Error Codes: Decoding Drive Fault Messages
Quick Summary
The Super Pump VS 700 drive display shows fault codes and status messages when it detects conditions outside normal parameters. Write down the exact message before power cycling the pump — some faults clear on restart, making the message the only diagnostic evidence you have. Most faults map to one of four categories: voltage problems, overload conditions, communication failures, or drive hardware faults.
- Write down the exact error text before doing anything else — it may clear on power cycle
- Voltage faults: supply voltage is too high or too low — measure at the junction box
- Overload faults: motor is drawing excessive current — check for mechanical obstruction or low voltage
- Communication faults: automation system cannot reach the pump — check RS-485 wiring
- Drive faults that persist after power cycle usually require drive replacement
Before You Start: Document the Error
The single most important step when any VS pump shows a fault code is to write it down verbatim — including any numbers, letters, and the exact phrasing — before touching the power. Many VS drive faults are latching (they persist until cleared), but some are non-latching and will disappear when power is cycled. If you power cycle first and the fault clears, you have lost the diagnostic information.
On the Super Pump VS 700, errors display on the drive keypad/display panel. If the pump was found already stopped with no display activity, restore power and observe whether an error appears before the pump tries to run.
Voltage Fault: Supply Too Low
The VS drive monitors supply voltage continuously. When input voltage drops below the drive's minimum threshold, it halts motor operation to prevent winding damage from operating at low voltage. The display will show a low voltage or undervoltage fault message.
What causes low voltage faults
- Undersized wiring from the panel to the pump — voltage drop across the wire resistance
- A loose or corroded connection in the circuit — even a small resistance increase causes measurable voltage drop under load
- Utility supply issues — if other loads on the same circuit or panel are pulling down voltage
- A weak circuit breaker that has begun to resist current flow internally
How to diagnose and resolve
- Measure supply voltage at the motor junction box terminals with the pump off — note the no-load voltage.
- Start the pump and measure voltage again under load. A drop greater than 10% of nameplate voltage (e.g., below 216V for a 240V motor) confirms a supply problem.
- Check all terminal connections in the junction box for tightness and corrosion. A loose connection that heats up under load is a common source of progressive voltage drop.
- If wiring is confirmed undersized for the run length, a licensed electrician must increase wire gauge. This is not a pump repair — it is an electrical installation issue.
Voltage Fault: Supply Too High
An overvoltage fault occurs when supply voltage exceeds the drive's maximum input threshold. This is less common than undervoltage but can occur during utility voltage fluctuations or if the pump was wired for 120V but is receiving 240V.
How to diagnose and resolve
- Measure supply voltage at the junction box. If it exceeds 264V on a 240V pump, contact the utility company — this is a supply problem.
- Verify wiring matches the motor nameplate. A pump wired for 120V but receiving 240V will display an overvoltage fault on every startup.
- If voltage is within spec and the fault appears intermittently, suspect a transient spike from another load switching on the same circuit (e.g., a heater or compressor). A surge protector upstream of the pump can help in this case.
Overload Fault
An overload fault means the drive detected that the motor was drawing more current than its rated maximum for a sustained period. This is the drive's electronic version of the thermal overload protector — it protects the drive output stage as well as the motor windings.
Common causes
- A jammed or partially blocked impeller increasing mechanical load
- Low supply voltage causing the motor to draw higher current for the same torque
- A seized bearing in the motor increasing friction
- Operating at very high speed with high system head (high filter pressure, partially closed valves) for extended periods
How to diagnose and resolve
- Check the motor shaft for free rotation (power off — use a screwdriver through the fan shroud).
- Measure supply voltage under load.
- Check filter pressure and valve positions — reduce system head if possible.
- If mechanical and voltage causes are eliminated, the drive output transistors may be failing and causing excessive current delivery — this requires drive replacement.
Communication Fault
A communication fault indicates the pump's VS drive cannot establish or maintain a connection with an external automation system. See the communication error article for full diagnostic steps. In brief:
- Verify RS-485 wiring between the pump and the automation controller — polarity matters (A to A, B to B)
- Confirm the pump's communication address matches what the automation system expects
- Check whether the automation system firmware supports VS pump communication
- A communication fault should not prevent the pump from running on its local schedule — the pump should continue to operate on its onboard program when communication is lost
Drive Hardware Faults
Some fault codes indicate an internal drive failure rather than a correctable external condition. These are identified by fault codes that:
- Persist after a complete power cycle (breaker off for 30+ seconds, then back on)
- Cannot be traced to any electrical supply, mechanical, or communication condition
- Appear immediately on power-up before the motor is commanded to run
- Are accompanied by visible damage: burn marks on the control board, melted components, or signs of water intrusion
If a drive hardware fault is confirmed, the drive unit must be replaced. Note that on the Super Pump VS 700, the drive and motor are separate components — a failed drive does not necessarily mean the motor is damaged. However, if water has entered the drive enclosure, inspect the motor winding connections as well before installing the replacement drive.
Safety Before Diagnosing Faults
Always turn off the breaker and verify power is dead at the pump before opening the junction box or control enclosure. VS drives contain capacitors that hold charge after power is removed — wait at least 30 seconds after cutting power before touching any internal components of the drive enclosure.
Frequently Asked Questions
The error cleared after I power cycled the breaker — should I still investigate?
Yes. A fault that clears on power cycle but recurs is indicating an intermittent condition that will become permanent over time. Note when the fault appeared, how long the pump had been running, and what conditions existed (ambient temperature, system pressure, speed setting). This pattern helps narrow the cause even when the fault is not currently visible.
The display is showing a fault code I cannot find in the manual — what do I do?
Contact Hayward technical support with the exact code and model number. The Super Pump VS 700 drive firmware has been updated over time, and newer fault codes may not appear in older printed manuals. Hayward's technical support line can identify any fault code and provide the correct resolution steps.
The display is completely blank — is that a fault code?
A blank display with power applied is not a coded fault — it indicates either no power is reaching the control board, or the display board has failed. Check the breaker and wiring first. If power is confirmed at the junction box but the display is blank, suspect a failed display board or a blown internal fuse on the control board.
Can I clear a fault without cycling power?
Some VS drive faults can be cleared by pressing the appropriate button on the display panel — typically a reset or stop button held for a few seconds. Refer to the specific VS drive user interface guide for your model. However, clearing a fault without correcting the underlying cause will result in the fault returning, often within the same run cycle.
My pump is showing an error but still running — should I stop it?
Some VS drives display warning conditions while still running the motor, while other faults halt operation immediately. If the pump is running but showing a warning, it typically means a condition is approaching a threshold but has not yet triggered a shutdown. Investigate the warning before the next pump cycle — do not ignore a warning that the pump is still running through, as the condition may worsen and cause a full shutdown or winding damage.