P2
Certikin
Water Inlet Temperature Sensor Fault
P2 error on Certikin heat pump; unit will not start.
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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
Failed inlet water sensor, Loose sensor connection on control board, Sensor not properly inserted into water line, Cable damage due to vibration or rodents
How to Fix / Troubleshooting
Safety first: Isolate electrical power before accessing sensors or the control panel.
- Locate inlet sensor: Identify the inlet water temperature sensor on the heat pump’s water manifold.
- Check seating: Ensure the sensor is fully inserted and secured in its pocket or tee.
- Inspect cable: Look for cuts, abrasions, or pulled cables and repair or replace as needed.
- Reseat connector: Disconnect and reconnect the sensor plug at the control PCB.
- Restart: Restore power and see if P2 clears.
If the error remains, the sensor should be replaced with a genuine Certikin part.
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Repair Difficulty
Medium
3/5
Required Part
Certikin heat pump inlet water temperature sensor
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