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After turns out to have been a bad connection of the pressure switch. So thankful it wasn't worse.
Thank you for your help.

How do I do that?

how about the pressure switch? I had this problem and I had to replace the pressure switch.

It's loosing heat and it's at 79 now. It's going to be below freezing tonight. What can I do?

I have an older model Emerald Spa (2002-3). I have recently replaced the pressure switch and the pump. Everything has been working fine until the temps went down below freezing here.
My...