RayBac Spa heater display not turning on

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Is your heater connected to any automation?

Give us the background. Is this new to you? Has it ever worked for you?
 
Depending on the year, 2010? there is a black switch on the heater. Some, have it on the right side of the heater, others have it just below the control panel. You may also have a failed transformer, or chewed (rats/mice) wiring. Have you taken a look behind the control panel (4 screws) for wire damage?

BTW, yours i beleive is a P-R266A-EN-C
 
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