Instructions / Assembly

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| NX25-120 & NX25-240 SERIES AC FUEL TRANSFER PUMPS
INSTALLATION AND OPERATION MANUAL
Intelligent Tones
Your nextec pump features a self‑diagnostic system that will aid you in troubleshooting should the need arise. The pump will emit a series of tones; note the order and number
ofhighand low pitched tones to determine the fault condition.
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 detecting, and how to resolve it. In the chart below, arrows pointing up (↑) indicate high tones,
arrowspointingdown(↓) indicate low tones. Conditions listed in BOLD are not field serviceable, and require the pump to be returned to the manufacturer.
3-Tone Faults (Application / Installation faults)
Tones Condition Solution
↑ ↓ ↓
Low input voltage (auto shut‑off) Check input wiring gauge, length, and connections
↑ ↓ ↑
High input voltage (auto shut‑off) Check incoming voltage
↓ ↑ ↑
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
4-Tone Faults (Hardware faults)
Tones Condition Solution
↓ ↑ ↑ ↑
Hardware fault (auto shut-off) Troubleshoot as described below**
↓ ↑ ↓ ↓
Hardware over temperature (auto shut‑off) Turn switch off and allow pump to cool*
↓ ↓ ↑ ↑
Motor over temperature (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, or cycle power to motor.
** 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. If this procedure does not restart the pump, or if you have additional questions, contact Technical Support at
1 [phone].