F2
Vax
Pump Control / Triac Failure
F2 displayed, solution pump runs continuously or not at all regardless of trigger
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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
Shorted pump control triac on PCB, Stuck trigger switch, Short circuit in pump wiring, Failed control PCB
How to Fix / Troubleshooting
Safety first: Unplug the machine before any disassembly. PCB work should only be done by competent persons.
- Check trigger switch: Access the handle and test the trigger microswitch for sticking or permanent ON state. Replace if faulty.
- Inspect pump wiring: Look for crushed or damaged wires between the PCB and pump. Repair or replace the wiring loom if insulation is damaged.
- Visual PCB inspection: Remove the PCB cover and inspect the pump control area (often near a heatsink). Look for burnt components or cracked solder joints.
- Replace PCB if triac failed: If the pump runs constantly even with the trigger disconnected, the control triac on the PCB is likely shorted. Replace the main control PCB as an assembly.
- Test after reassembly: Refit all covers, plug in, and test pump operation with the trigger. If F2 persists, seek professional service.
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Repair Difficulty
Professional Required
5/5
Required Part
Main Control PCB
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