I recently posted about my duo therm heat pump/ACs quickly cycling on and off and staying off for hours at a time. The shop was stumped after several attempts to fix. A mobile mechanic suggested sequentially cutting off lights and not using various outlets to see if perhaps a partially bad ground might be the culprit. Yep, light over the sink. Left it off and problems went away. Light worked perfectly by the way Hope this info may be helpful to others

A very common problem, if the light is florescent. Change the ballast or switch to an LED bulb and your problem will go away.If you join the Monacoers forum , you would have gotten that advice within minutes, as it is a well known issue.

Was this a florescent light?Do you have a remote thermostat for A/C control?

Yes, it was a fluorescent light and the comfort control has a remote sensor

Could also be RF interference. Thin-lite and others make RF suppressed ballasts. We use them on the sailboat to keep from interfering with electronic equipment.Just "google" Thinlite RF ballast.

In case you need to know | Good Sam Community

sc3283
Explorer
Jul 31, 2013
I verified the same thing on our last outing. Light over sink (a couple feet from the 5 button CC T stat on left side of coach) will make frt AC short cycle or shut off totally.

the flor. light over the dinette (right side of coach) will shut the rear AC off totally.

We verified this 3 different times....and once keeping those 2 lights off..both AC units worked perfectly
mdprince
Explorer
Jul 27, 2013
Always glad to hear about the fix - no matter how strange !! ty
Executive45
Explorer III
Jul 27, 2013
bgholson wrote:
Thanks Executive for posting solution onto my original posting

You're welcome...:B...Dennis
bgholson
Explorer
Jul 27, 2013
Thanks Executive for posting solution onto my original posting
J-Rooster
Explorer
Jul 27, 2013
Dog Folks wrote:
Thanks for reporting back.
X-2, thanks for the info!
Executive45
Explorer III
Jul 27, 2013
Actually, you should go BACK to your original post and put the solution there. Someone may have subscribed to that post and will never see your solution....Dennis
Canadian_Rainbi
Explorer
Jul 26, 2013
wolfe10 wrote:
Could also be RF interference. Thin-lite and others make RF suppressed ballasts. We use them on the sailboat to keep from interfering with electronic equipment.

Just "google" Thinlite RF ballast.

I agree with the possibility of RF interference. Maybe change it out to an led strip?
Dog_Folks
Explorer
Jul 26, 2013
Thanks for reporting back.
wolfe10
Explorer
Jul 26, 2013
Could also be RF interference. Thin-lite and others make RF suppressed ballasts. We use them on the sailboat to keep from interfering with electronic equipment.

Just "google" Thinlite RF ballast.
bgholson
Explorer
Jul 26, 2013
Yes, it was a fluorescent light and the comfort control has a remote sensor