45
2. The total dynamic head (vertical lift plus
pipe friction) may be higher than you think
it is.
3. There may be an obstruction to the water
flow — sediment in the pipe, ice in the
pipe, a crushed pipe or a partially closed
valve. (Is there a float valve at the tank?)
4. Helical rotor models: Water may be
warmer than 72°F (22°C). This causes the
rubber stator to expand and tighten
against the rotor (temporarily, non-
damaging). See Section 12 for tempera-
ture limits.
5. Helical rotor models: Pump may have run
dry. Remove the pump stator (outer body)
from the motor, to reveal the rotor. If there
is some rubber stuck to the rotor, the
pump end must be replaced.
To reset the OVERLOAD shutoff (red light),
switch the pump controller OFF and ON.
LOWER CURRENT
may indicate:
1. In a deep well, the level of water in the
source may be far above the pump intake,
so the actual lift is less than you think. This
is not a problem.
2. The pump head may be worn, thus easier
to turn than normal (especially if there is
abrasive sediment).
3. There may be a leak in the pipe system,
reducing the pressure load.
4. Helical rotor models: Water may be colder
than 46°F (8°C). This causes the rubber
stator to contract, away from the rotor. The
pump spins easier and produces less flow
under pressure.
Test the low-water probe circuit
If the controller indicates “SOURCE LOW”
when the pump is in the water, the low-water
probe system may be at fault. (See Section
5.9.) The controller applies 5VDC to the
probe terminals. When the water level is
above the probe, the switch in the probe
makes contact. That causes the applied
voltage to drop toward zero. The systems
“sees water” and allows the pump to run. If
the voltage is greater than 3V, dry shutoff is
triggered.
Test #9
The low-water probe has an internal 1K
resistor in series with the switch. When closed
(in water), the normal resistance is around
1000 .
To bypass the low-water probe (and activate
the pump), connect a small wire between the
probe terminals (
Test #1
and
Test #2
) in the
junction box. Restart the controller. If the
pump runs, there is a fault at the probe or in
the probe wiring. The wires may be shorted
(touching each other) or open (broken) or the
moving part on the probe may be stuck with
debris, or the probe may be out of its normal,
vertical position.
Test the full-tank float switch
If the controller indicates “TANK FULL” when
the tank is not full, the float switch or pressure
switch system may be at fault. (See Section
5.10 or 5.12)
1. If the remote switch circuit is NOT being
used, there must be a wire between
terminals 4 and 5.
2. There are two types of float switch,
“normally open” and “normally closed”.
Check to see that the wiring is correct for
the type that is used.
3. Most float switches are “normally open”.
Disconnect a wire from terminal 3 or 4,
and the pump should run. Connect a wire
between terminal 3 and 4, and the pump
should stop. See also
Test #10
4. Most pressure switches (and some float
switches) are “normally closed”. Connect
a wire between terminals 4 and 5, and
the pump should run. See also
Test #11
If the pump responds to the bypass tests
above but not to the float switch, the wires
may be shorted (touching each other) or
open (broken), or the switch may be stuck
Electrical Testing continued
