De Dietrich
Flow Restriction or Gas Flow Noise
Water heater emits a whistling or high-pitched noise when running
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Possible Causes
Partially closed isolation valve on De Dietrich unit, Blocked inlet filter, Gas valve whistling at certain modulation, Air in system
How to Fix / Troubleshooting
Safety first: Distinguish between water and gas noises; gas-related noises must be checked by a professional.
Step-by-step checks:
- Check valves: Ensure all water isolation valves are fully open.
- Clean filters: Remove and clean inlet filters to restore full flow.
- Bleed air: Remove air from radiators and high points.
When to call a professional: If the noise appears to come from the gas valve or burner, contact a gas-safe technician.
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Repair Difficulty
Easy
2/5
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