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With volt-ohm meter (vom) check for 24v input power. Most output voltage will be 5v DC, check for that. If the relays are soldered on to the board, your only solution is to replace the board. A "ticking" sound may be a bad relay. One check you can make is to disconnect any incoming power to the unit and remove the board. Inspect the soldered side of the board, if you see any black or brown spots, most likely the board is bad and will need to be replaced.
To OzAnday If the light indicator of your unit have light with power "on", then there is a problem with the unit. May the fuse of your pcb is open or the pcb itself has a problem. You have to call a qualified technician to check.
To floscar Reset the rest button of your remote control, but if it wont work may the remote itself has a problem or the receiver board.