Liberty Pumps PDC-Series - Manual (Page 4)

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Front-Panel Indicators
The horn and LED indicators on the front panel are used to show various conditions of the controller. Each indicator is
described below.
Indicator Indicator state Description
Power led OFF Power is off to the panel and the battery is dead
On constantly Primary power to the panel is ON
Blinking Primary power to the panel is OFF; the panel is on alarm backup power. Pumps will
NOT run. See Front-Panel indicators
– On Alarm backup power.
*Horn disable
LED Blinking Horn operation is DISABLED. The horn will NOT sound in an alarm condition.
OFF Horn operation is ENABLED. The horn WILL sound in an alarm condition
Alarm LED OFF There is no alarm condition
On constantly An alarm condition is active
Blinking The Alarm Float switch is not working properly
Pump 1 LED OFF The pump is not being called to run
On constantly The pump is being called to run
Blinking A pumping alarm condition occurred multiple times; see the section Pumping Alarm
Condition below
Pump 2 LED OFF The pump is not being called to run
On constantly The pump is being called to run
Blinking A pumping alarm condition occurred multiple times; see the section Pumping Alarm
Condition below
Both pump 1 &
Pump 2 LED Blinking The primary float switch is not working properly.
Horn OFF No alarm condition is present, and the alarm backup battery is in good condition
ON An alarm condition is present
Chirping The voltage of the alarm backup battery is low and the battery should be replaced
*Horn disable LED is on PDC-115 and PDC230 units only. Outdoor units, PDCW-115 and PDCW-230, have an alarm
silence switch on the exterior of the unit.
Pumping Alarm Condition
– On Primary Power
The controller monitors a “pumping alarm condition” where a pump is called to run and the liquid level continues to rise
and goes above the Alarm Float switch. If a pumping alarm condition occurs three or more of the last five times a pump is
called to run, the pump indicator will blink indicating system components should be checked. Any of the following
conditions could cause a pumping alarm condition:
1) A pump fails to operate
2) The Alarm Float switch stays (mechanically stuck) in the closed (on, or up) position.
3) There is a problem (blocked or leak) in the out-flow plumbing
4) The water in-flow rate is greater than the pump-out rate
5) The Primary Float switch stays (mechanically stuck) in the open (off, or down) position.
A blinking light indicates a component failed and service is required. To assist the service technician the controller will
indicate which component has failed.
Blinking LED Related problem
Power light No AC power, main breaker has tripped or power outage
Pump 1 Pump failed to operate; fuse tripped , jammed impeller, unplugged, short circuit…
Pump 2 Pump failed to operate; fuse tripped , jammed impeller, unplugged, short circuit…
Pump 1 and pump 2 Primary float switch; mechanically stuck open or tangled in an open condition.
Alarm light Alarm float switch; mechanically stuck closed or tangled in a closed condition.