Upon arrival customer stated that nothing was coming on for system. Stated unit had been working fine with no issues since repair was done. After inspection of system found that fuse was blown on equipment side of system. There was still power for thermostats and zone board. Did a full inspection on 24 volt circuit and did not see anything that would cause fuse to blow. Contactor tested good, no wires were touching on system. Customer did advised me that power did flicker and came right back on before this happened. Construction In neighborhood just finished as well. Installed new fuse and ran heat for 45 minutes did not find any issues with refrigerant repairs that was done in December, refrigerant pressures were great with no issues. System went through full defrost cycle and had no issues and fuse nevern blew. Cycled system down turned ac on let it run for 45 minutes and no issues found on ac. Replaced (15x20x1) system filter. Advised customer that system is running at this time, di