Antminer S19 Hydro – Coolant Temperature Too High
water inlet temp too high
Critical — Immediate action required
Symptoms
- Coolant temperature warning in web interface
- Miner throttles or shuts down
- CDU unable to maintain temperature
Step-by-Step Fix
Check CDU (Coolant Distribution Unit) operation and coolant levels.
Verify coolant flow rate meets manufacturer specifications.
Inspect for air bubbles in the cooling loop that reduce heat transfer.
Clean CDU heat exchangers and filters.
Check ambient temperature around the CDU — ensure it has adequate ventilation.
Verify coolant mixture ratio (typically 50/50 water and glycol).
When to Seek Professional Repair
If the steps above do not resolve the issue, or if you are not comfortable performing these repairs yourself, professional service is recommended. Attempting advanced repairs without proper equipment can cause further damage.
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