1 Intermittent "Tool Error: Sensor Disconnect" (Error #5) during heating - FixHub SLD101
I'm experiencing an intermittent "Tool Error: Sensor Disconnect" (Error Code #5) on my FixHub Portable Soldering Station during the heating phase.
Symptoms:
- While heating, the error flashes for ~1 second, the temperature display drops a few degrees, then heating resumes. This cycles repeatedly.
- Using firmware 1.5.0 on both Hub and Iron.
- Tip is a 1.5 Bevel.
Troubleshooting already performed:
- Verified tip is fully seated (clicked in, aligned below the surface).
- Cleaned 3.5mm contacts and internal handle springs with IPA.
- Disassembled the iron handle; internal soldering points for the socket are secure and show no signs of failure.
- Measured tip resistance at ~3 ohms at room temperature.
- Tested both front USB-C ports with the original cable (same result).
- Tested with third-party 100W cables (MacBook/IKEA), which resulted in Error #11 (No Data), confirming the hub requires the specific data lines of the original cable.
The intermittent nature suggests a thermal expansion break inside the tip's sensor circuit. Are there any known issues with this behavior or specific tests I can run to verify if it's the tip vs. the iron handle's internal logic?
Ist dies eine gute Frage?
10 
2 Tsd. 
I've forwarded your issue on to the iFixit product team
von DanJ
Hello @jswg , thank you for reaching out. I am pretty sure that your will receive assistance in a short period of time from our iFixit colleagues.
Did you check with a different tip just to be sure it is not just a faulty soldering tip?
von BenZ78
Hey!
Seems like the fixbot-assisted troubleshooting was likely wrong. I bought a new tip (same Iron Wedge 1.5 Tip) but the sensor disconnect error remains.
Will contact support again.
von jswg
@jswg, sorry the new tip didn't resolve it. Good call reaching out to support directly. I'll also pass this along to the FixBot team so the troubleshooting steps can be reviewed.
von Kris Rodriguez
Update:
After some human-support-assisted troubleshooting the problem turned out to be the iron itself. They replaced the iron, and the new one works!
von jswg