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DANGER! DO NOT open or attempt to repair the motor on your Tuthill pump. Return it to the place
of purchase for service. Opening the motor case will compromise the integrity of the Explosion Proof
construction and void any existing warranty, approvals, and certications (i.e.: ATEX, UL listing, CE, etc.).
DANGER! Disconnect all power prior to performing any service or maintenance. Failure to disconnect the
power may cause electrical shock, or unexpected starting of the motor, resulting in injury or death.
Troubleshooting
Tones Condition Cure
↑ ↓ ↓ Low battery voltage (auto shut-off) Charge or replace battery*
↑ ↓ ↑ High battery voltage (auto-shut off) Connect to 12 to 24 VDC power source*
↓ ↑ ↑ Locked rotor (auto shut-off) Turn switch off and inspect rotor and vanes*
↓ ↑ ↓ Priming / Suction / Lift failure Check for leaks in suction tube, inlet connections, inside tank
plumbing restrictions, excessive vertical suction lift, empty tank
Intelligent Tones
Y
our nextec pump features a self-diagnostic system that will aid you in troubleshooting should the need arise. The pump
will give off a series of high and low tones; simply count the high and low tones to determine which conditions exist.
Depending on the condition the pump senses, it will generate either a 3-tone code, or a 4-tone code:
• 3-Tone codes indicate an application fault; something dealing with the installation of the pump, like a priming or
supply voltage concern.
• 4-Tone codes indicate a pump fault; a condition outside the operating parameters of the pump, like an over-
temperature condition, or something dealing with the pumps internal electronics.
Refer to the table below to determine which condition your pump is detecing, and how to resolve it. In the chart below,
arrows pointing up (↑) indicate high tones, arrows pointing down (↓) indicate low tones; their order tells which fault
is detected. Conditions listed in BOLD are not eld servicable, and require the pump to be returned to the
manufacturer.
3-Tone Faults (Application / installation faults)
4-Tone Faults (Hardware faults)
Tones Condition Cure
↓ ↑ ↑ ↑ Hardware fault (auto shut-off) Troubleshoot as described below**
↓ ↑ ↓ ↓ Hardware overtemperature (auto-shut off) Turn switch off and allow pump to cool*
↓ ↓ ↑ ↑ Motor overtemperature (auto shut-off) Turn switch off and allow pump to cool*
↓ ↓ ↑ ↓ Motor overvoltage (auto shut-off) Troubleshoot as described below**
↓ ↓ ↓ ↑ Motor undervoltage(auto shut-off) Troubleshoot as described below**
*This condition will shut the motor off. To restart the motor, cycle the switch off, then back on.
** Prior to returning pump to place of purchase, perform this procedure: cycle the switch off and disconnect power for at least one minute.
Reconnect power, and cycle the switch back on. Verify proper pump operation.
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