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at the thermostat, the R and Rc have a jumper between them. There are no other jumpers at the thermostat, air handler or heat pump.

Despite my best effort to find a good installer, the installation of a new heat pump system has been a nightmare. Thankfully, with persistence, I have been able to get problems resolved. However, over the weekend, I realized that during the defrost cycle, the auxiliary heat does not kick in...