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I Have a vita L700C whenever I try to use the topside panel it always blinks no matter what setting I am in and it wont heat up. The clock will blink, when I change the setting to see the water temperature it continues to blink, when I change it to the set temp of 102 degrees it continues to blink. I have replaced the recirculator pump and the heater element. I am going to put in a new topside panel due to it being hard to read due to the condensation that has built up over the years. All 3 pumps work as they should. I tested the new heater element and the Ohms were within spec. When i turn the breaker on and test the heater for voltage it only reads at 0.023V. The heater element is a 4kW @ 240v system. Any ideas or help to guide me in the right direction would be greatly appreciated.

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Post photos of the circuit board and the schematic on the inside cover so we can see what you have. 

Is the heat indicator icon on?

If it is on and the spa should be heating but no 240V at the heater element then you might have a blown heater relay. Post the pics 

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