Flo ? for Flow Error?
That would for any number of reasons that the Flow Switch is not sensing enough water flow to trip the sensor/pressure switch or actual true water flow switch.
Heater will not run or heat, if there is not enough water flowing!
The heater will sense this. So, whatever will restrict or stop sufficient water flow is the problem.
And finally, you may have a bad flow switch/sensor
SOURCE: code on my Laars l2400 is FL0. How do I fix?
Try cleaning filter or buy a new one i worked Cal Spas was senior service tec in las vegas never worked on laars with digital read outs but flow is not enough water passing threw exchanger which could trip high heat reset also. Flo mostlikly restricted by filter. Good luck!! and have a good day
SOURCE: getting FL0 error message.
Thank
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Page 34 and
35 of your manual, found here, describe FL0 as a
flow issue most likely caused by dirty filters. Depending on the type of filter
you have a good cleaning/backwash will usually remedy that. It is also possible
the unit's pressure switch, which senses water flow and therefore reacts to
dirty filters when present, may have failed, especially if you winterize the
heater in a cold climate and leave water in the switch which can burst the
diaphragm inside.
Start with
cleaning the filter. If the heater still won't fire jump out the pressure
switch while the pump is running to confirm the part is the problem. Assuming
it is replacing it with a new pressure switch which should be under $75. The
part number can be found in the rear of the manual.
John
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