Termet Unstable DHW Temperature Control

Domestic hot water temperature fluctuates or is not stable on a combi Termet furnace/boiler.

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.

Possible Causes

Scaled DHW plate heat exchanger, Faulty DHW NTC sensor, Inadequate flow rate, Three-way valve sticking on Termet hydraulic block

Safety: Hot water can scald. Use caution when testing.

Check flow rate: Avoid opening multiple hot taps simultaneously. Maintain a steady flow at one tap.
Clean inlet filters: Clean cold water inlet filters to ensure stable flow.
Descale DHW heat exchanger: Have a professional chemically descale the plate heat exchanger if scaling is suspected.

Persistent temperature swings usually require a technician to test sensors and the three-way valve.

Medium 3/5

DHW Plate Heat Exchanger

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