Pool and Spa
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Good afternoon, and welcome to the Technical section in JustAnswer, an independent paid question and answer platform that matches customers' questions to experts in various skills. My name is ***** ***** I'll be happy to help you today.There are many components on the PCB, therefore many possible causes of failure. A power surge is a possible cause, but that would not normally damage a heater element.Are you saying that both components failed at the same time? Were they both working recently?_____There's no time pressure on this topic - it will stay open to you for many days, and you can reply at any time. I will be away from my desk sometimes, but will respond as soon as I can.
I disagree - they didn't say that both failed at the same time. You're inferring that.When did the power go off, and for how long?And when did you purchase the spa?
Is the main switch an RCD, or a switchfuse?
OK. An RCD can trip at the moment that a heater element fails, because the most common failure mode is for the element insulation to break down and leak current to earth.There are various things on a PCB that might cause an RCD to trip. Depending on the design, if there was a surge of current when the element shorted to earth then it might cause a component on the PCB to fail. That would be a poor design.Since you had to pay for both of the new parts, I would expect the contractor to leave them with you, because they are your property. Then you can analyse what happened. If they took them away, then ask them to return the parts. If they cannot return the parts, then tell them that they have stolen the parts, and you expect replacements or a refund of the cost.