Rooftop AC Clicking When Using Furnace or AC

Question: When turning on either the air or the furnace there is a lot of clicking coming from the rooftop ac unit. It sounds like the relays are going crazy. Wha tmight cause this?

Robbie: If the relays are chattering you need to have the Computer Circuit Board looked at by a qualified RV Tech. The Circuit Board runs your Furnace and Roof AC when activated by the wall Thermostat. If could be a loose connection or the board has a internal short and is going bad. Either way I suggest a RV tech analyze your problem. Good Luck

Thanks for the Question Good Luck,

Comments for Rooftop AC Clicking When Using Furnace or AC

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Jul 06, 2018
Clicking noise coming from inside the Rv NEW
by: Anonymous

What if the circuit board for the air conditioning unit is brand new installed two weeks ago and it's making that clicking noise? It sounds like it's short-circuiting and the unit was only put in 2 weeks ago what do I do?

Jul 06, 2018
Clicking coming from AC NEW
by: Anonymous

I have also turn my air conditioner completely off and it's still clicking and trying to turn on. Like I said in my previous comment this air conditioner was only put in 2 weeks ago it should not be doing this...
What could be the problem and what do I do because a friend of mine had someone that was a professional RV Tech install it but I can't get the name from him because we are not on speaking terms..

Oct 16, 2018
How to fix the clicking relay in the AC NEW
by: Justin

All you have to do the fix the clicking in the AC unit when you're running the furnace. Fine your thermostat manual. Look for how to control your temperature differential. It's probably set for a one degree difference. Change it to 2 degrees. This will keep it from cycling too fast.

Mar 22, 2021
Temp differential stops the clicking NEW
by: Anonymous

Temp differential did the trick. Thank you!

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Robbie Warford, San Diego RV Repair

Hi, I'm Robbie. Welcome to!

Like the name implies, this site is all about helping you save money while keeping your RV in tip-top shape--and that is all about you having the knowledge to do so.

I've been a technician in the RV industry for 30 years, operating out of San Diego, California. And let me tell you, I love my job.

But I also love empowering RVers with the knowledge they need to make the right decision on repairs, or to make the fix themselves--and that, my friend, is the reason for this website. I hope you enjoy.

Or, learn more about me, my RV service practice, & this website here.