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In the input of the relay and at the output of the rectifier bridge the measured direct current is 22.6 volts. When the heating process is on, the DC current measured at the SSR input is 22.3-22.4v instead when the heating process is off, it is approximately 22.6-22.8v.
So to be clear - the voltage across the ssr terminals 3 and 4 is always in the range 22.3 - 22.8 V? It never drops to zero Volts even when the heating process is Off? This is surprising and not what one would expect.
Why will you not connect the SSR to the controller's SSR output? This output is designed to switch the SSR on and off.
Could you draw a diagram of how items are connected please?