Thermostat replacement

You have to use that ZC tstat. It is proprietary to RVP(Coleman). 00 is a common problem caused by AC/DC ripple feedback in the wiring caused by defective lights or appliances in an RV. The defect is not noticeable and usually it is a Fluorescent light ballast that causes the problem. You can remove the 00 by
1. taking the cover off the tstat and removing the glass fuse for 10 minutes. reinstall and 00 should be gone
2. killing all 12 volt power to the RV for 10 minutes and that will reset the tstat. Doug

Bam! That was it. Thanks Doug! The fluorescents all seem ok, anyway to chase the fault down?

the only way to find the cause is to disconnect lights one at a time and then see if the 00 code never occurs. do you have fluorescent lights in the motorhome? Doug

Three but the covers keep falling off when we drive so I may look for LED replacements now....cheers and thanks again!

It can be any appliance that is leaking dirty voltage to the system. But, Fl lights are the most common culprit. The bad ones still work, the ballast leaks rf ripple into the DC circuit wiring. Doug