Heat Pump blows 5amp fuse when switching between defrost & back to heat. Em Heat work
I have a Carrier Heat Pump System. It’s about 5 years old and has functioned OK until this Christmas Eve. One problem is the condensing unit is not kicking back on after it goes into defrost mode. I found a 5AMP fuse blown in the attic unit and once replaced it functioned. At least for a day or two (I’m guessing until it went into defrost mode again). My thermostat blinks “heat on” but will not communicate to turn the heat pump back on (regardless of timeframe). The “on” fan will kick on if done at the thermostat but not “auto” (in heat mode). When I go to “Em Heat” it kicks on immediately & works as intended. I’ve learned it heats better than nothing. I had a few local Heating & Air guys come out to service/fix etc. One of the two companies went to get parts on the 3rd of January….. guess he’s not coming back. 2nd guy was here 30 min, pumped $600 of Freon in the system and was gone before I could get home from work (30 min away). He also found and fixed something loose up close to the breaker that has blown a few times. It worked a week (warmer weather) then more of the same. When I went up to change the fuse in the attic it was not blown. When I turned the breaker back on located on the attic unit it starting working (had left the thermostat set to “heat”). Only thing I can come up with is loose wires or circuit board?? Later that night I had to go back to Em. Heat and can’t seem to rattle it back to life. Can you damage by overcharging the system? Tech told me no leaks in system-if installed correctly 5 years ago is that possible? Wow……………….that ended up more like a novel!? Any direction would be appreciated…….its cold!