Clicking in A/C when furnace kicks in

[arniez]

I have a Keystone Passport travel trailer with a Dometic air conditioner. There is a series of clicking sounds, sometimes just a few, sometimes up to 20, before the furnace kicks in. Then a couple of clicks while the furnace is running, and then another series of clicks when the furnace is shutting down. I brought the trailer to my dealer to have them check it out and they couldn't find anything wrong. As usual, the dealer said they couldn't duplicate the clicking, which is crazy because it happens all the time. Is anyone else experiencing this? Thanks.