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Instructions
EZ Boost
TM
System
8.4. EZ Boost controller fault finding chart (continued)
Fault
Possible Cause
Remedy
10. The EZ Boost controller indicates
“Speed reduction” and “Overload”.
Speed reduction is activated so as to maintain a reduced performance
a) The pump is worn or blocked.
b) The pump is too large for the installed
motor.
• The pump must be serviced.
• Replace pump or motor.
11. The EZ Boost controller indicates
“Over temperature”.
The temperature sensor in the motor is sensing a temperature above the values stated in
Section 9, Factory settings:
a) Insufficient cooling of the motor.
• Restore correct cooling of the motor.
The flow velocity past the motor should
be at least 0.5 ft/s (0.15 m/s).
12. The EZ Boost controller indicates
“Overload”.
a) The pump is worn or blocked.
b) The pump is too large for the installed
motor.
• The pump must be serviced.
• Replace pump or motor.
13. The EZ Boost controller indicates
“Sensor defective”.
a) The pressure sensor is defective.
• Check that the sensor is wired correctly.
If the sensor type is 4-20 mA, measure
the DC voltage across the sensor input
terminals. If the DC voltage measured
at the sensor input terminals is not
between 2 and 10 volts the sensor,
or wiring is defective. Refer to Section
10, Pressure Sensor Voltage Chart.
Replace defective parts. Are the LED
“Sensor defective” and the LED, pos. 1,
on? See section 7.3.3., Position of LED’s.
Yes:
The total load of 24 VDC from
terminal 5 is above 100 mA. Disconnect
the sensor in order to determine if it is
defective. Replace defective sensor.
No:
The load is OK, but the EZ Boost
controller sensor input may be
defective.
14. The pump is operating on/off.
a) No communication.
• Check that the LED “No contact to
pump” is on.
If so, the control unit EZ Boost controller
starts and stops the pump, based on the
sensor signal only. The EZ Boost
controller has to be reset after each 250
stop.- see fault no. 5 for remedy
LEZTL01.indd
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