Overheating Warning
Thermal protection circuit has detected excessive operating temperature in critical power supply components, typically above 85°C. The control IC activates thermal shutdown to prevent component damage and potential fire hazard.
Error Code
E7927
Severity
Fault
Equipment
Power Supply
Manufacturer
Bosch Rexroth
Red LED thermal alarm indicator illuminated continuously on front panel
Output voltage drops to 85-90% of nominal rating during thermal event
Audible alarm chirping at 2-second intervals from internal buzzer
Fan speed increases to maximum 4800 RPM but insufficient cooling maintained
Digital display shows TEMP FAULT message alternating with actual temperature reading
Unit automatically shuts down after 30-second thermal warning period
Blocked air intake filters reducing airflow by 60-80% causing inadequate cooling
Failed cooling fan motor or damaged fan blades creating insufficient air circulation
Degraded thermal interface material between heatsinks and power semiconductors
Overloaded output exceeding 110% rated capacity generating excessive heat dissipation
Ambient temperature exceeding 50°C specification in inadequately ventilated enclosure
Internal dust accumulation on heatsink fins reducing thermal transfer efficiency
Execute LOTO procedure: disconnect AC input power and wait 10 minutes for capacitor discharge
Remove input/output filters and clean with compressed air at 90 PSI pressure
Test cooling fan motor: measure 24VDC supply voltage and verify 200-250mA current draw
Check heatsink thermal compound: remove power devices and apply fresh thermal paste
Measure load current with clamp meter: verify operation within 100% rated capacity
Verify ambient temperature below 45°C and ensure 6-inch clearance around ventilation
Power up unit and monitor thermal sensor reading: confirm operation below 75°C under full load
Safety First: Always isolate power and follow LOTO (Lockout/Tagout) procedures before working on electrical components. If unsure, contact a certified repair technician.
Get fault code alerts for Bosch Rexroth equipment
Weekly repair tips, new fault codes, maintenance guides — free.
Other Bosch Rexroth Fault Codes
View all →Get Your Equipment
Back in Action — Fast
Send us your faulty industrial electronics. Our engineers will diagnose it and provide a detailed quote within 24 hours — with no obligation to proceed.
Free Evaluation
No obligation
48hr Turnaround
Fastest in India
6-Month Warranty
Every repair
No Fix, No Charge
Zero risk policy
Pan-India Pickup
Doorstep service