IVT
Unstable DHW temperature control
Domestic hot water temperature fluctuates or runs hot then cold (IVT combi/hydronic with DHW)
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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 plate heat exchanger, Faulty DHW sensor, Incorrect flow rate through DHW circuit, Mixing valve malfunction
How to Fix / Troubleshooting
Safety: Hot water can cause scalding. Turn off power and close water valves before opening components.
- Check flow rate: Avoid running multiple hot water taps simultaneously; excessive flow can exceed the furnace's capacity.
- Inspect DHW sensor: Ensure the IVT DHW sensor is properly attached and functioning; replace if faulty.
- Descale heat exchanger: Have a technician chemically descale the plate heat exchanger if scale buildup is suspected.
- Check mixing valve: If an external thermostatic mixing valve is installed, verify its setting and operation.
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Repair Difficulty
Hard
4/5
Required Part
IVT DHW plate heat exchanger
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