Question about Jandy Lite2 Lj175n 175,000 Btu Natural Gas Heater

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Flo 6 showing on display panel?

We just replaced our gas valve 2 weeks ago heater was working fine.This morning Flo 6 message came on What's the problem?

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Posted on Oct 15, 2009


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LAARS LX250N-L error code AIR FLO SW and sometimes a HI LIM SW cannot locate the source of the problem?

hi limits are located under where the pipes go into the heater if corroded replace if wires bad replace to test you can jump them at the board only testing if left jumped heater could catch fire

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Error code 71

Absolute best solution for Tankless water heater is to replace whole thing with tank-type water heater and quit spending money fixing an old computer with multiple sensors that is connected to your water pipes, electric line, and gas line, that is connected to a gas burner with vent pipe to outdoors ... As if each of these systems doesn't have a load of problems on its own without a computer chip.
Otherwise, I do not have a source of information that is better than a service manual.

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1 Answer

Circulation pump is running but FLO is displayed on panel and heat light goes out.

FLO is displayed because something has caused a reduction in water pressure through the heater. The spa control will turn the heater off when FLO is displayed to prevent a burn out.
I suggest checking the filter cartridge, the suction fittings & any valve which could be partially closed & restricting flow.
Try run the spa with out the filter cartridge if this clears the error then it is the cartridge.
If none of these work it is possible the your flow switch and/or pump is beginning to fail.
Good luck!

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1 Answer

J-300 won't heat. FLO readout

FLO = It typically for a Flow Switch or pressure switch (heater is deactivated. Pump may also be deactivated).
It is most likely a flow/pressure switch failure.

Before you buy a replacement try running the spa with out the filter cartridge - Checking if dirty cartridge is the issue. Also check that all gate valves are all the way open & locked.

Jan 05, 2012 | Jacuzzi Home

1 Answer

Was working fine and this week my jandy turns off as soon as turnse on and then display , service, air flo what that can be

Service-air flo, is telling us that the combustion fan is either not able to blow enough air either due to a blockage, or a fan failure, OR the air switch that detects this feature has failed, OR the rubber tubing used to connect the air-switch to the blower assembley is burned, or cracked.
Follow the tubing from the blower to the air switch to find it, then check the condition of the tubing. Replace if broken, burned , or cracked. If this is not the problem , it gets much more involved after this, and you must be familiar with a multimeter and know the internal electrical operations of the heater to troubleshoot it.
Id check the tubing, and call a certified Jandy tech if the problem persists.

Apr 11, 2011 | Jandy Laars LX Pool Heater / 400,000 BTU /...

1 Answer

When my spa is on heat mode pump on Low Speed it will not heat up. It says FLO and flashes do I have an air lock ??? Just changed pump a month ago.

FLO is a common signal for insufficient water flow through the heater tube. Do you see the low speed pump working? If you do, then try removing your filters, if FLO goes away then replace your filters with new ones. If not, your flow switch may not be working. You could have a legitimate flow issue caused from a clog or air-lock though.

Dec 17, 2010 | Qca Spas Majestic Series Aruba Xl Hot Tub

1 Answer

Filled artic spa 36 hours ago. not heating properly. what should I check?

If you don't have any error codes, FLO, FLC, then there is a chance your heater has burnt out. You would need an Ohm meter to measure if you have continuity thru the heater element. You should read 11 to 12 ohms. If you have either FLO or FLC on the display this indicates a problem with the pressure switch. The pressure switch is threaded into the side of the heater, the stainless steel tube attached to the #1 or main pump. Its a round module with two wires attached to it. There is an adjusting post in the center of the module. For an FLO code turn the post half a turn CCW. For an FLC code turn it half a turn CW. If this does not solve the problem replace the pressure switch.

Oct 16, 2010 | Arctic Pool & Spa

1 Answer

I have a 2003 Arctic spa and have changed the heater. I have a HL sensor error on the panel but the tub is cold?

HL usually means that the heater is working and there is no water passing through it, do you get a flo error message before the HL,I had the same problem, mine was the flo switch

Oct 08, 2010 | Pool & Spa

1 Answer

How to fox flo 6 problem on Jandy lite2 175n pool heater

possible was the wron one I assume was the same one clean the filter clean the basket check for clog impeller

Jun 28, 2009 | Jandy Laars Lite2 Ld 175,000 Btu Heater

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