E18
Kripsol
Flow Switch Stuck Closed / Safety Logic Fault
Heater displays E18; pump is running but heater does not respond to heat 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
Kripsol flow switch jammed in closed position, Bypassed or shorted flow switch wiring, Control board detecting impossible flow conditions, Incorrect hydraulic installation
How to Fix / Troubleshooting
Safety first: Disconnect power before working on the flow switch or wiring. Do not permanently bypass safety switches.
- Inspect flow switch: Locate the Kripsol flow switch on the water manifold. Remove it and check that the paddle or magnetic plunger moves freely. Clean any scale or debris.
- Check wiring integrity: Ensure the flow switch wires are not shorted together. Remove any unauthorized jumpers that may have been installed to bypass the switch.
- Hydraulic check: Confirm that the heater is installed in the correct position relative to the pump and filter, and that flow direction matches the arrows on the Kripsol manifold.
- Test operation: With the pump off, the flow switch should be open (no continuity). With the pump on, it should close. Replace the switch if it does not change state correctly.
- Reset and test: Restore power and verify that E18 clears and the heater responds normally to flow changes.
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Repair Difficulty
Medium
3/5
Required Part
Kripsol flow switch
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