How to replace the transformer

Transformers rarely fail,and when they do, it’s usually caused by people not turning the power off when they are moving wires and the 24VAC wires touch.  Sometimes a failed solenoid could cause transformer problems but the timer usually shuts off and issues a FUS message before the transformer is damaged.  Some models also have fuses on the back terminal board that help protect it.

A note of caution – the transformer is connected to your household 110/120VAC power, which is dangerous.  Be sure to take precautions by turning off the power before working on the unit.  You should not attempt it unless you are experienced enough to do so.  This post does not contain sufficient information to work with these voltages safely; If in doubt, contact someone who is qualified. 

Most of the time people think that the transformer is bad when it isn’t,  Follow the DIY page topic on ‘How to test if the transformer is good’ to know for sure.

If you conclude that the transformer is bad, you can use the following information to help you understand how to replace it. I generally start on the left side and work my way around counter-clockwise.

After removing the case, you’ll see how the transformer is connected into the case.  You can often find them on ebay or at a local landscape supply store.It should be rated for 1.25A, 24VAC.

   

 

The transformer typically looks like this.

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Good luck,

Brian, Jen, Meghan and Ben – the rainDialDoctors

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