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So, to disable photocells one needs to bridge terminals COM and PHC. Controller is operating as expected now without photocell safety feature. Blue wire is the bridge on screenshot.

Still looking the way to rule out the photocell. What do I need to bypass to be able to run gate controller without photocell ?

When I opened the TX photocell cover then I did notice some water damage. I even used the F-02 flux remover to clean the PCB. Is there a way to "disconnect" the photocells and use the gate controller without photocells, does controller need to be reprogrammed ? Want to eliminate the faulty...

Looks like voltage is OK ? Faulty photocell(s) ?

I did remove fuses for testing with multimeter. Checked voltages on TX and RX, attached files with readings.

Verified, both fuses (F2 and F1) are OK. What I did not understand was the sign "I" on LCD. Is it some status code ? Photocells were producing clicking sound previously, but not any more. Photocell positions have not changed.

I have a Beninca BULL8 OM.S and it stopped responding to remote control. LED indicator shows "I". Photocells are not making any "click" sound when waving hand in front of the photocell. Any directions how to trobleshoot ?