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5
TROUBLESHOOTING
Error
Code Reason Action Solution
Problem Cause Solution
To reset switch at any time: Press 5 6 buttons simultaneously for 5 seconds.
*Unit will monitor voltage until voltage condition returns to normal. Pump will restart automatically.
Display will not
illuminate
No power
Improper wiring
Improper voltage
Check circuit breaker and wiring
connection
Check polarity and wiring
Ensure voltage is 115V or 230V
HI or LO setting will
not change
Differential attempted is below
10 psi or above 55 psi
Minimum cut-in reached
Maximum cutout reached
Differential cannot be less than 10 psi
or greater than 55 psi
LO cannot be set below 10 psi
HI cannot be set above 80 psi
Pump will not reach
cut-off (HI)
HI setting greater than pump
rating
Insufficient prime (above ground
pumps)
No water to pump
Pump or line blockage
Fixture open or leak in plumbing
Reduce HI setting to within pump
capability
Prime pump as directed by
manufacturer - use manual operation
mode
Check shutoff valves
Remove obstructions
Determine cause of flow and remedy
Pump rapid cycles
Pressure tank too small
Differential too narrow
Waterlogged pressure tank
Improper tank air charge
Improper wiring
Size tank per manufacturer’s literature
Spread range via HI or LO setting
Replace tank
Charge as instructed by manufacturer
Check proper wiring to “line in”, L1 &
L2
Pump will not activate
No power
DC2 error encountered
Faulty pump
Improper wiring (DC2 or pump)
Check circuit breaker and wiring
connections
See error chart below
Contact pump manufacturer
Check wiring per manufacturer’s
instructions
Water flow stops
before cut-in
Tank precharge too high Adjust precharge per manufacturer’s
instruction
Display reads
upside-down
Mounting position may vary Press 5 6 together for 3 seconds
and screen will rotate 180 degrees
E1
Rapid cycle
Excessive amp draw
Switch continues to
operate
See “Pump Rapid Cycle”
above
Have pump checked for
proper operation
E2 Low-suction shutoff
(running pressure) below 10 PSI
Shutoff. Auto restart after
60 min.
(A) Determine cause of
low-suction
(B) Check Wiring
(C) Inspect pump
E3 Improper voltage Shutoff after 2 min.* Restore voltage to proper
range
MODEL DC2 ERROR CODES
UNIT CONTAINS NO SERVICEABLE PARTS. REMOVAL OF MAIN CIRCUIT BOARD COVER WILL VOID WARRANTY.