roof ac

allbrandauto wrote:
both my roof ac with a comfort zc thermostat will run for 15 minutes than shut off.when it does it reads 00.and can not switch zones.pull fuse and it works again for 15 minutes than the same thing .another thermostat same thing need help

The most common cause of 00 on the older ZC tstats is a defective Flourecent Light. Try leaving all those type lights off and see if the 00 goes away. Doug

thanks doug left all the lights off same problem. I noticed my inverter making a buzzing noise every 10 seconds and the inverter fan was not running can that do it

im sorry doug but the converter is making the noise

The usual troubleshooting is to pull EACH 12 volt house fuse at a time and then wait and see if the 00 comes on. Once you find the fuse that when pulled stops the 00 problem you then trace and find what appliances are on that fuse and then disconnect 1 at a time to find the culprit. You could also disconnect the Power Converter 120 supply and see if the Converter is the problem. You don't need the Power Converter for the 1 hour for this test. Doug
PS, the RVP choke and filters they sell for the ZC tstat rarely fix this problem

thanks doug am I looking at a strictly 12 volt problem