Buderus
Unstable DHW Temperature Control
Domestic hot water temperature fluctuates between hot and cold
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Scaled or partially blocked plate heat exchanger, Faulty DHW NTC sensor, Inadequate flow rate through DHW circuit, Modulating gas valve not responding correctly
How to Fix / Troubleshooting
Safety: Risk of scalding. Be cautious when testing hot water.
- 1. Check flow rate: Ensure taps are opened sufficiently. Very low flow can cause cycling and temperature swings.
- 2. Clean inlet filter: Clean the cold water inlet filter to ensure stable flow.
- 3. DHW sensor: Inspect and test the DHW NTC sensor; replace if readings are unstable.
- 4. Plate heat exchanger: A technician should remove and descale or replace the DHW plate heat exchanger if scale buildup is suspected.
- 5. Gas valve modulation: A Buderus technician should verify correct gas valve modulation and combustion settings.
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Repair Difficulty
Hard
4/5
Required Part
DHW Plate Heat Exchanger / DHW NTC Sensor
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