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Troubleshooting
Refer to
"Status Display" on page
Count the repetitive flashes to determine which fault the unit is reporting.
LED
None
Green Flashing 10 seconds,
Red 1 flash, 1 second pause
Green Rapid Flash
(2 blinks per second,
1 second pause)
Green Flashing
Red Solid
Red Flashing
(1 flash, 1 second pause)
Red Flashing
(2 flashes, 1 second pause)
Red Flashing
(3 flashes, 1 second pause)
Red Flashing
(4 flashes, 1 second pause)
Red Flashing
(5 flashes, 1 second pause
Red Flashing
(6 flashes, 1 second pause)
NOTE: The motor in this unit contains thermal protection that responds to motor current and heat from the
motor winding and ambient temperature. When the combination of current and heat exceeds a pre-deter-
mined point, the thermal protector opens and interrupts the circuit. When the winding temperature returns
to a more normal level, the thermal protector automatically resets.
13. The LED flashes in a repetitive pattern representing operational state.
Fault
Unit will not turn on
Circuit breaker tripped or turned off
Unit runs briefly, does
not develop pressure,
Insufficient water or prime
then turns off
Unit will not start with
Inlet water pressure above 40 psi
demand for water
(2.8 bar)
Improper charge pressure in tank
Check valve between tank and unit Place check valve after pressure tank.
Unit continuously
Leak or usage exceeds 0.5 gpm (1.9
cycles ON/OFF (Rapid
lpm) in system plumbing
Cycle)
Internal non-return (check) valve is
blocked or damaged
Internal flow piston is stuck open
Unit is turned OFF
Dry Run Fault
Overvoltage (input voltage higher
than +10%)
Undervoltage (input voltage lower
than -10%)
Unit will not turn on
Flow Sensor Component Failure
Temperature sensor fault
Overheating due to excessive water
temperature
Continuous hot water detected
above thermal limit when unit is not
running
Possible Cause
Turn on the circuit breaker. Consult a
licensed electrician to properly wire the
Outlet/Junction Box.
Check water supply, valving, and priming
sections of this manual for additional infor-
mation.
Install a pressure reducing valve on inlet to
reduce inlet pressure, or wait for the inlet
pressure to fall below 40 psi (2.8 bar).
Set the pressure in pressure tank to 2 psi
lower than cut-in pressure.
Repair all plumbing leaks.
Place a new non-return (check) valve
before unit in inlet plumbing.
Clean the flow piston (see
Flow Piston" on page
Press the push button on the user interface.
Check inlet water supply and valving.
Make sure outlet pressure switch setting is
not adjusted too high.
Consult a licensed electrician to check the
supply voltage and correct.
Consult professional for replacement parts
or unit.
Supply cold water to the pump.
Improper hot water application of unit.
Supply cold water to the pump.
MAINTENANCE
Troubleshooting
Corrective Action
"Cleaning the
14).
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