Rigel 4 and Clonix not receiving signals

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We have gates controlled by a Rigel 4 unit with a Clonix radio receiver.
They have been very reliable for about 15 years but now they don't seem to be receiving any signals from the transmitters.
The LEDs on the main PCB are lit up correctly as described by the manual and all 3 fuses appear intact.
I wondered if the receiver has lost it's programming but when I pressed the microswitch on the Clonix board the LED on this PCB doesn't light up at all so I'm now of the opinion that the Clonix unit is the problem.

Does anyone have any ideas what else I can try to troubleshoot the problem ?

Thanks,

Paul

hi

did you call up any service team during 15 years ?