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Troubleshooting
Problem
Display will not illuminate.
HI or LO setting will not
change.
Pump will not reach
cut-out (HI).
Pump rapid cycles.
Pump will not start.
Water flow stops before
cut-in.
Display reads upside-down. Mounting position may vary.
Error Codes
Code
Reason
Rapid cycle.
E1
Excessive amp draw.
Low water cut-off.
E2
Running pressure below 10 PSI.
E3
Improper voltage.
E4
Electrical disturbance.
To reset switch at any time: Press 5 6 buttons simultaneously for 5 seconds.
1400 Division Road, West Warwick, RI USA 02893
T: 800.426.8765 www.amtrol.com
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One or more features of this product are covered by U.S. patents, visit www.amtrol.com/patents for more information.
Cause
No power.
Improper wiring.
Improper voltage.
Differential attempted is below 10 psi
or above 55 psi.
Minimum cut-in reached.
Maximum cut-out reached.
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.
Pressure tank too small.
Differential too narrow.
Waterlogged pressure tank.
Improper tank air charge.
Improper wiring.
No power.
Guardian CP error encountered.
Faulty pump.
Improper wiring (Guardian CP or pump).
Tank precharge too high.
connected.
Solution
Check circuit breaker and wiring connection.
Check polarity and wiring.
Ensure voltage is 115V or 230V.
Differential cannot be less than 10 psi or greater
than 55 psi. Adjust as necessary.
LO cannot be set below 10 psi.
HI cannot be set above 80 psi.
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 water flow and remedy.
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.
Check circuit breaker and wiring connections.
See error chart below.
Contact pump manufacturer.
Check wiring per manufacturer's instructions.
Adjust precharge per manufacturer's instruction.
Press 5 6 together for 3 seconds and screen
will rotate 180 degrees.
Action
Pump continues to operate.
Pump shuts off.
Auto restart after 60 min.
Pump shuts off.
Auto restart when voltage
Pump shuts off.
Solution
See "Pump Rapid Cycles" above.
Have pump checked for
proper operation.
(A) Determine cause of
low-suction
(B) Check Wiring
(C) Inspect pump
Restore voltage to proper
range. Unit will monitor voltage
until it returns to normal. Pump
will restart automatically.
Disconnect power for one
minute to reset. If error
persists, contact Amtrol
Technical Support.
Part #: 9046-0001 (11/22)
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