How to Troubleshoot an Irritrol RD 1200 Rain Dial

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The system allows you to run a test cycle after installation.
The system allows you to run a test cycle after installation. (Image: Jupiterimages/Photos.com/Getty Images)

The Irritrol RD-1200 Rain Dial is a 12-station irrigation system, which controls a specific lawn and garden schedule for connected sprinklers. The system features three program modes, various schedule settings and battery back-up power in case of power outages. The system also supports CMR-KIT and KSR-KIT remote control models. After the system is installed, you might experience technical setbacks, such as non-operation and sporadic watering schedules. You’ll want your system operating perfectly before leaving for extended periods of time.

Valves Don't Operate

Inspect the Function switch (located at the bottom of the Rain Dial), as it might be set to "Off." If the switch is set to "Off," switch it to "Run."

Move the Function switch to "Set Programs" and twist the dial (located in the center of the 1200) to "Today" to confirm that the current day appears in the display (located at the top of the 1200). If the day is correct, twist the dial to the day in question. The day displays either "On" or "Off." If the incorrect day is displayed in "Today," press the "+" or "-" buttons (located to the right of the display) to display the current day.

Move the Function switch to "Set Programs" and move the Program switch to "A," "B" or "C." Twist the dial to "Start Time 1" and push the "+" or "-" button to set the start time. Set the times for each program as necessary. When the start time is set, twist the dial to "Current Time."

Watering Day Is Wrong

Move the Function switch to "Set Programs" to begin setup for a weekday watering. Move the Program switch to the desired program, twist the dial to "Schedule [and the day you wish to program]" and push the "+" or "-" button to select "On" or "Off."

Move the Function switch to "Set Programs," select a Program, and twist the dial to "Skip Days/Special Functions" to begin setting a Skip Days schedule. Push the "+" or "-" button to specify a "Once Every 01-31" setting, twist the dial to "Today" and push the "+" or "-" button to choose the current day in the interval. For example, if you want to water the lawn every five days and you wish the next watering day to be in three days, select the current day as "02."

Move the Function switch to "Set Programs," select a program, and turn the dial to "Odd/Even" to set an odd or even day schedule. Push the "Manual On" button until the screen displays dashes. Push the "+" or "-" button to select "Odd" or "Even."

Some Valves Don’t Operate

Expose the connected valve’s solenoid and test it for proper functionality using a solenoid voltmeter. If the solenoid is bad, replace it.

Inspect all wiring between the valves in question and the timer. Confirm that the connected wires are secure and properly attached. If wiring is damaged or disconnected, replace it.

Inspect the valve common wire for proper connection to each valve and to the timer’s "VC" terminal. Make sure the connected wire is properly stripped at the ends and no wire insulation is inserted into the terminal.

No Power

Inspect the circuit breaker, which protects the timer, and confirm whether or not the breaker is tripped. If the breaker is tripped, reset it.

Inspect the wiring from the timer to the power source, which might be a transformer. Look for frayed, cut or dented wiring. If the wiring is damaged, replace it. If the wiring is loose, reconnect it securely to the timer and transformer.

Disconnect power from the timer, open the timer controller door and open the control module from its right edge. Examine the fuse at the top of the PC board to confirm whether or not it’s blown. If the fuse is blown, remove it from the retaining clip and reinsert a new 2.0A slow blow fuse. Reconnect power to the timer.

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