Delta · MS300Fault Code oH1Warning
Delta MS300 — oH1 Heatsink Overtemperature
Occurs when the heatsink temperature exceeds the limit. Fan failure, dust or high ambient temperature are the main causes.
Updated: 2026-07-05
Symptoms
- oH1 after long operation
- Frequent in hot cabinets/summer
- Fan weak or stopped
Probable Causes
- Cooling fan faulty/dusty
- Air duct blockage
- High ambient temperature
Checkpoints
- Verify fan and airflow
- Clean the heatsink
- Measure ambient temperature
Solution
A faulty fan is replaced. If a temperature-sensing (NTC) fault is suspected, the board is tested.
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