So I have been having a bit of an issue with my furnace since installing the nest thermostat. The first day after I installed it was perfect. Everything was working. The second day I kept getting the error that C wire had no power. I redid all the wires on the furnace control board and the thermostat (cut and restripped them). That got it working for the next couple of weeks. However, the last 3 days I have been having other issues with it. About 3 days ago I had an issue with no power to the RH wire. I checked the wires, circuit breakers, and the fuses and all was good. I went to check the voltages R to W good, R to Y good, R to C spark and burnt fuse (was following a nest troubleshooting guide). I replaced the fuse and miraculously the nest can detect voltage on the RH wire. Today, I come home from work and nest is displaying the no power to RH wire error again. I check the circuits good, wires good, voltages showed 0 (I did R to W and R to Y). I even jumped the R to W and R to Y and nothing. I checked the fuse and it was good good (removed it to get a better look at it this time). After I put the fuse back in I jump the wires again and another miracle the furnace starts. I have an older york furnace (1990s) and it has been pretty good until now. Any help to figure out a fix for this issue would be greatly appreciated. The wires I have for the thermostat are RH, W1, Y1, G, and C. On the furnace control board they are in this configuration.
Y W R G C (Board labels) Y(t),Y(ac) W R G C,R(ac) (wires in each slot. t=thermostat, ac=ac unit)