What does error code Flow red mean on a Pentair salt chlorinator?

No flow through the cell. Not enough water flow through the cell, so no chlorine is being made.

Can I fix Pentair code Flow red myself?

Start with these safe checks: Check that the pump is running, baskets are empty, the filter is clean, and valves to the cell are open. If flow is good and the light stays red, have the flow sensing checked.

When should I call a technician for code Flow red?

If flow is good and the light stays red, have the flow sensing checked. Water and electricity together can kill. Turn the equipment off at the breaker before you open anything, never touch equipment while standing in water, and stay out of the pool or spa if you feel tingling or suspect an electrical problem. Leave wiring, boards and GFCI faults to a licensed electrician or service tech.

Pentair Salt Chlorinator Error Code Flow red / Flow: No flow…

What Flow red means

Not enough water flow through the cell, so no chlorine is being made.

Also shown as: Flow, depending on the model.

Likely causes

Pump off or too slow
Dirty filter
Closed valves

Safe first checks

Check that the pump is running, baskets are empty, the filter is clean, and valves to the cell are open.

When to stop

If flow is good and the light stays red, have the flow sensing checked.

Checked against: Pentair IntelliChlor IC15/IC20/IC40/IC60 installation and user's guide. Codes can differ by model and year, so confirm with your owner's manual.