Pool and Spa
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Sorry for the delay I was away from my office for a day or so and I just saw your question. So am I to assume that you have replaced the small fuse by this time? It sounds like this 3 amp fuse was the one for the topside control. You stated that you checked the transformer for power in did you check the output for the 12-24 volts? If you have power in the transformer and nothing out and the fuse is good then the transformer is bad, if you are unsure replace the 3 amp fuse again.