Weishaupt
Temperature Instability / Flow Modulation Issue
Hot water temperature fluctuates between hot and cold during a shower.
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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
DHW flow sensor reading erratically, Scale in plate heat exchanger, Inconsistent cold water supply pressure, Faulty modulation control on gas valve
How to Fix / Troubleshooting
Safety: Beware of sudden hot water temperature changes that can cause scalding.
- Check shower mixer: Ensure the thermostatic mixer is not faulty by testing hot water at a simple basin tap.
- Stabilize flow: Run a single hot tap at a steady flow. Avoid rapid opening/closing of taps which can confuse flow sensing.
- Clean flow sensor: Remove and clean the Weishaupt DHW flow sensor turbine and inlet filter to ensure accurate flow measurement.
- Descale plate heat exchanger: Have a technician descale the plate heat exchanger if scale buildup is suspected.
- Gas modulation check: A professional should verify that the gas valve modulates smoothly in response to demand.
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Repair Difficulty
Medium
3/5
Required Part
DHW Flow Sensor Assembly
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