P1
Certikin
Water Flow Protection / Flow Switch Open
P1 error on Certikin heat pump; unit stops heating.
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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
Insufficient water flow through Certikin heat pump, Blocked water filter or strainer, Air lock in pool pipework, Faulty water flow switch
How to Fix / Troubleshooting
Safety first: Turn off power to the heat pump and circulation pump before opening any water connections.
- Check pump operation: Ensure the pool circulation pump is running and correctly primed.
- Clean strainers and filters: Remove debris from pump baskets and backwash or clean the main filter.
- Bleed air: Open any air bleed valves on the Certikin heat pump or high points in the system to remove trapped air.
- Inspect flow switch: Locate the water flow switch on the heat pump’s water circuit and check for leaks or damaged wiring.
- Restart: Restore power and test. If P1 persists with good flow, the flow switch may need replacement.
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Repair Difficulty
Medium
3/5
Required Part
Certikin heat pump water flow switch
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