Whirlpool
Flow Restriction / Partially Closed Valve
Whistling or high-pitched noise from water heater when hot water is used
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Possible Causes
Partially closed shutoff valve, restricted inlet nipple, debris in mixing valve, scale in hot outlet
How to Fix / Troubleshooting
Safety first: Use caution; pipes may be hot.
Steps:
- Verify the cold water shutoff valve to the heater is fully open.
- Check any installed mixing or tempering valves for restrictions; clean or replace as needed.
- Inspect flex connectors for kinks or internal collapse; replace if suspect.
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Repair Difficulty
Easy
2/5
Required Part
Cold Inlet Shutoff Valve / Mixing Valve
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