Thermal Cutout
The thermal protection circuit has activated an immediate shutdown due to critical component temperatures exceeding safe operating limits, typically 100°C for semiconductors or 85°C for electrolytic capacitors. This is an emergency protection mechanism that indicates imminent component failure and requires immediate service intervention.
Error Code
F907
Severity
Fault
Equipment
Power Supply
Manufacturer
ABB
Immediate power supply shutdown with no output voltage present
Solid red fault LED with no blinking pattern on front panel
No cooling fan operation after thermal cutout activation
Power supply will not restart until manually reset after cooldown period
Junction temperature of power semiconductors exceeds 90°C when measured
Discoloration or carbonization visible on PCB around high-power components
Complete cooling fan failure with zero airflow through heat sink assemblies
Thermal runaway in power MOSFETs due to gate drive circuit malfunction
Catastrophic failure of thermal interface material causing 50°C temperature rise
Short circuit in output rectifier diodes causing excessive current and heating
Control IC thermal shutdown due to inadequate heat sinking of control board
Blocked ventilation causing internal ambient temperature to exceed 60°C
Implement lockout/tagout and wait minimum 2 hours for complete thermal stabilization
Inspect for visible component damage, carbonization, or thermal stress indicators
Replace cooling fan assembly and verify proper electrical connections and RPM feedback
Remove all power semiconductors, clean mounting surfaces, and apply new thermal interface material
Test all power diodes and MOSFETs out-of-circuit using semiconductor analyzer
Replace thermal protection IC and verify trip point calibration at 85°C ±2°C
Perform 4-hour burn-in test at full rated load while monitoring all critical temperatures
Safety First: Always isolate power and follow LOTO (Lockout/Tagout) procedures before working on electrical components. If unsure, contact a certified repair technician.
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