E19
Termet
Flow Switch / DHW Flow Sensor Fault (combi models)
Furnace shows E19, burner output limited or unit shuts down under high demand.
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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
Stuck DHW flow switch, Blocked flow turbine sensor, Scale or debris in DHW inlet filter, Faulty flow sensor on Termet hydraulic block
How to Fix / Troubleshooting
Safety: Turn off power and close water valves. Relieve pressure before opening water components.
- Clean inlet filter: Close the cold water inlet to the Termet unit. Remove and clean the inlet filter screen of debris.
- Check flow switch/turbine: Locate the DHW flow sensor or switch on the hydraulic block. Remove it carefully and check for scale or debris. Clean with vinegar solution if scaled.
- Verify movement: Ensure the flow paddle or turbine spins/moves freely when water is turned on.
- Inspect wiring: Confirm the sensor connector is firmly attached to the PCB.
Persistent E19 may require replacement of the DHW flow sensor by a qualified technician.
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Repair Difficulty
Medium
3/5
Required Part
DHW Flow Sensor / Flow Switch
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