Troubleshooting; Leit Key; Leit Controller; Lema Solenoid Actuator - DIG LEIT 4000 Series Instruction Manual

6. TROUBLESHOOTING

The LEIT irrigation control system is a series of connected components consisting of an ambient light powered
controller, LEIT Key, LEMA actuators, hydraulic control valves, and field wires/splices. It is best to troubleshoot
this DC system (like an AC system) by a process of elimination; the goal being to determine which component(s)
has failed. The following facts and tips may be helpful to eliminate certain components and facilitate faster
troubleshooting. It is assumed that these are installed controllers that are receiving the proper amount of light.
Keep in mind that the problem may be with more than one component.

6.1 LEIT Key

1. Use only name brand, alkaline, 9-volt batteries.
2. Weak batteries in a good LEIT Key will result in no display, a "CHARGING PLEASE WAIT" message, or a
partial or blinking display.
3. If the LEIT Key works in one LEIT controller but not another, the key is functioning and the problem is with
the controller.
4. If in doubt about the battery, install a new battery, or test the key with a multi-meter by holding the probes
into the metal holes, voltage should be at least 8-volts DC.
5. The LEIT Key will work with all current and discontinued SOLATROL, ALTEC, and current LEIT controllers.
6.2 LEIT Controllers
1. If a "good" LEIT Key is inserted into a controller and there is no display, the problem is with the controller.
2. When a "good" LEIT Key is installed in a LEIT controller, "PRESS YES WHEN MOST READABLE" (English
or Spanish) should appear on the display immediately.
3. If a LEIT Key is installed and the display reads "CHARGING PLEASE WAIT" the controller probably has a
problem with the PVM.
4. If the LEIT controller is not holding the current day/time, the problem is with the controller.
5. If the display is scrambled or showing unrecognizable characters, first install a new battery in the LEIT Key.
6. If one or more of the keypad buttons are sticky or non-functional, the problem is with the controller.
7. To test a controller's output, connect a "good" LEMA 1600HE or 1500 actuator directly to the terminal strip,
and initiate a temporary Manual Run with 1 minute to the station in question and zero minutes on all other
stations. Verify that the plunger retracts and extends or you hear the sound of the plunger latching inside
the solenoid. If it does not retract or make any sound, the problem is with the controller.
8. ALTEC Dash 4 or LEMA 1600 actuators cannot be used on expansion controllers.
9. If the controller functions properly doing a temporary Manual Run, but is not running valves automatically
by program, the controller is probably incorrectly programmed. In SETUP SYSTEM check active programs,
sensor & MV/P settings. In SETUP SCHEDULE, make sure no programs overlap.
10. LEIT controllers will only function with LEMA actuators.
11. Compatible rain sensors are the HUNTER MINI-CLIK or RAIN BIRD RSD. The SKIT 8821-4 sensor adapter
must be used with any sensor.
6.3 LEMA Solenoid Actuators
1. Verify that the proper model number, solenoid actuator and series is being used for the controller
in question.
2. Verify that the white wire is connected to the common wire, and the red wire is connected to the "hot"
wire, and that these splices are tight, and corrosion free.
3. Verify that no water is leaking near the adapter, stem or bonnet.
4. Verify that all O-rings and/or rubber sleeves are in place. If in doubt, check manuals.
a. To test a LEMA actuator, remove the actuator from the valve and disconnect the hot and common wires.
Verify the actuator functions with a 9-volt battery by holding the wires to the positive and negative
contacts. Reverse polarity if nothing happens. Plunger should retract. Reverse polarity to close, (plunger
should extend).
b. If a LEMA actuator does not function with a 9-volt battery, the problem is with the actuator, and it should
be replaced.
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