I am attempting to knock the dust off of our old taz 5. When I try heating the bed, the controller will reset. Some times it is nearly immediate, some times it takes a little while. I have a spare bed/heater, which I plugged in and tried, with the same results.
Does anyone have any troubleshooting tips for me?
Sounds like thermal protection kicking in. It’s either not heating when it should be (power applied, no raise of temperature detected by thermistor), temperature reading fails (thermistor reading drops to zero), or temperature is raising when it shouldn’t be applying power to the heater (stuck MOSFET or other failure).
Check the contacts on the board where the bed heater connects. It’s an uncommon, but known issue that the soldering on those connections fail over time.