Can I fix Jandy code CHECK FLOW myself?

Start with these safe checks: Make sure the pump is on and, if variable speed, at a high enough speed. Turn the pump off at the breaker, clean the filter and baskets (release pressure first), open the valves, and make sure the return eyeball fittings are in place. If flow is good and it stays, have a qualified tech check the pressure switch. Never bypass it.

When should I call a technician for code CHECK FLOW?

If flow is good and it stays, have a qualified tech check the pressure switch. Never bypass it. Smell gas? Leave right away, don't touch light switches or phones inside, and call your gas utility or 911 from outside. Never open a gas valve, burner, gas line, vent or flue connection, or bypass a safety switch. Repeated lockouts, scorching, soot, or a CO alarm mean shut it off and call a licensed gas technician.

Jandy Pool Heater Error Code CHECK FLOW: Check flow

What CHECK FLOW means

The heater isn't seeing enough water pressure: the pump isn't running, pump pressure is low, the pressure switch has a fault, or a variable-speed pump is set too low.

Likely causes

Pump off or too slow
Dirty filter or full baskets
Closed valves
Missing return eyeball fittings

Safe first checks

Make sure the pump is on and, if variable speed, at a high enough speed.
Turn the pump off at the breaker, clean the filter and baskets (release pressure first), open the valves, and make sure the return eyeball fittings are in place.

When to stop

If flow is good and it stays, have a qualified tech check the pressure switch. Never bypass it.

Parts that may help

Only order a part once the checks above point to it, and match the part number to your model.

Pressure Switch - Adjustable, SPST-NO, 4010P$36.99

Checked against: Jandy JXi gas-fired pool and spa heater installation and operation manual (H0574300). Codes can differ by model and year, so confirm with your owner's manual.