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QB93Z · 09-08-2017

I just remembered something about the HVAC system that affected my trouble shooting. The HVAC programmer needs to be powered off (Battery disconnected) after any changes you make to the system.

You may want to try disconnecting the battery now and see if the system returns to normal operation.

Jim

09-08-2017	#25
QB93Z Join Date: May 2007 Location: Westminster, Maryland Posts: 3,684	Re: No heat from heater 1990 ZR1 I just remembered something about the HVAC system that affected my trouble shooting. The HVAC programmer needs to be powered off (Battery disconnected) after any changes you make to the system. You may want to try disconnecting the battery now and see if the system returns to normal operation. Jim