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Heidenhain Controller
Overheat/Thermal · Intermediate · 30-120 minutes
HEIDENHAIN 320-0FC6 - Temperature of the MC main computer too high: °C (warning)
HEIDENHAIN alarm 320-0FC6 triggers when the MC main computer's internal temperature sensor detects excessive heat buildup beyond safe operating thresholds. This thermal protection alarm prevents component damage by alerting operators to cooling system failures or environmental issues affecting the TNC control unit.
320-0FC6
HEIDENHAIN 320-0FC6 - Temperature of the MC main computer too high: °C (warning)
Temperature of the MC main computer too high: °C (warning)
The temperature sensor detected excessive heat within the main computer housing. This may result from poor ventilation, contaminated filters, or cooling system failures.
Root Cause Summary
HEIDENHAIN alarm 320-0FC6 triggers when the MC main computer's internal temperature sensor detects excessive heat buildup beyond safe operating thresholds. This thermal protection alarm prevents component damage by alerting operators to cooling system failures or environmental issues affecting the TNC control unit.
Safety
- Refer to Heidenhain service manual
- Ensure qualified technician performs repairs
Causes and Fixes
- 1
Power down TNC system safely
Execute controlled shutdown via MOD function and disconnect main power to MC unit.
Allow 10 minutes cooling time before opening electrical cabinet
- 2
Inspect air filter assemblies
Remove filter pads from MC housing intake and exhaust ports. Check for dust accumulation, oil contamination, or physical blockage.
Use compressed air at 30 PSI maximum to avoid damaging filter media
- 3
Clean or replace filter elements
Clean reusable filters with degreasing solution or install new filter pads per HEIDENHAIN specifications.
Mark filter replacement date on housing for maintenance tracking
- 4
Verify airflow restoration
Power up system and monitor temperature readings in TNC diagnostic display to confirm improved cooling performance.
Call a technician if:
- ·Temperature sensor replacement required
- ·Cabinet cooling system repairs needed
- ·Multiple cooling system failures present
Prevention
- Replace air filters every 3-6 months depending on environment
- Monitor cabinet ambient temperature monthly
- Clean MC housing exterior surfaces quarterly
- Verify fan operation during routine maintenance
Common Mistakes
- Using incorrect filter media that restricts airflow
- Ignoring gradual temperature increases before alarm threshold
- Blocking ventilation clearances with cables or components
- Operating with cabinet doors open affecting climate control
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