Sime
No Ignition Without Error Indication
Water heater produces no hot water at all; display is on but burner never ignites and no error code is shown.
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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
Defective flow sensor not reaching start threshold, Stuck microswitch in hydraulic group, Very low mains water pressure, Faulty control board relay
How to Fix / Troubleshooting
Safety: Turn off power and close water and gas valves before opening the casing.
Steps:
- Check water flow: Open a hot tap fully. If flow is weak, address house water pressure or partially closed valves.
- Inspect flow sensor / hydraulic group: Locate the Sime hydraulic group and flow sensor. Check that the mechanical paddle or turbine moves freely. Clean any debris and ensure the microswitch actuates when flow is present.
- Listen for relay click: With the cover on and power restored, open a hot tap and listen for a click from the control board. If there is no click and the flow sensor is working, the board may be faulty.
Professional help: Replacement of the hydraulic group or control board should be done by a qualified technician.
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Repair Difficulty
Hard
4/5
Required Part
Hydraulic Group / Flow Sensor Assembly
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