I have an older 12v Hydraulic boat lift. The remote actuator has stopped working. The lift still actives using the manual/local control. I purchased your 202U 2-Channel unit.
I set the 202U 2-channel up on my work bench. I attached a 12v battery minder as a power supply (measures 10 volts). I have all 3 DIP switches off.
I held down PRG1 and plugged in the battery charger. The power LED came on, and the Signal LED came on.; I continued to hold the PRG1 down and pressed the A buttion on the remote. The Signal LED flashed twice. I released the A button then I released the PRG1 button, and disconnected the power. I reconnected the power, held down the A button on the remote, measured the voltage across the NO - COM. The voltage was zero.
So, I did the “Deleting All Stored Transmitter Codes” process. I went through the programming sequence - the Signal LED comes on solid, but never flashed again…Did that a couple of times. The Signal LED comes on, but it never flashed again.