JackieK Posted February 3, 2021 Report Share Posted February 3, 2021 Hi, my hot tub is is showing LF. It is full of water and I washed out the filter good. Any hints Quote Link to comment Share on other sites More sharing options...
CanadianSpaTech Posted February 3, 2021 Report Share Posted February 3, 2021 First remove the filter and reset the breaker. Run it without the filter and let us know if the LF comes back. If it goes away it might be time for a new filter or soaking the old one in some filter wash to do a deeper cleaning. 1 Quote Link to comment Share on other sites More sharing options...
JackieK Posted February 3, 2021 Author Report Share Posted February 3, 2021 Thank you I will try that. Quote Link to comment Share on other sites More sharing options...
JackieK Posted February 5, 2021 Author Report Share Posted February 5, 2021 On 2/3/2021 at 6:06 PM, CanadianSpaTech said: First remove the filter and reset the breaker. Run it without the filter and let us know if the LF comes back. If it goes away it might be time for a new filter or soaking the old one in some filter wash to do a deeper cleaning. Hi I removed the filter and reset and it still says LF and the temp stays about 56 Quote Link to comment Share on other sites More sharing options...
RDspaguy Posted February 5, 2021 Report Share Posted February 5, 2021 Refresh our memory on what tub you have, we "see" so many... LF is the result of the flow detection components reading insufficient flow through the heater. This could be a filter, faulty flow/pressure switch, faulty or clogged pump, or control issue. Quote Link to comment Share on other sites More sharing options...
JackieK Posted February 5, 2021 Author Report Share Posted February 5, 2021 It’s a bullfrog model 362. Quote Link to comment Share on other sites More sharing options...
RDspaguy Posted February 6, 2021 Report Share Posted February 6, 2021 Balboa controls, M7 technology. It uses the temp sensors to determine flow. So it is reading a greater difference between the A sensor (where the water enters the heater) and the B sensor (where the water leaves the heater) than it is expecting. This could be a low flow condition or a failing sensor. If I were there I would check that the circ pump is working and for debris in the impeller. Then I would test the sensors. So, do you have a multimeter and a big pair of channel locks? Post a pic of the equipment area. Quote Link to comment Share on other sites More sharing options...
CanadianSpaTech Posted February 6, 2021 Report Share Posted February 6, 2021 Please ensure all of the jets are open and moving water. Too many closed jets can also cause an LF Error. Does the spa have a circulation pump or does it use the main pump 1 for heating and filtering? Did you recently drain and refill the spa? Have you checked for air locks in the pump wet end associated with heating/filtering Make sure all gate/slice/T handle valves are in the up/open position Quote Link to comment Share on other sites More sharing options...
JackieK Posted February 16, 2021 Author Report Share Posted February 16, 2021 All jet are open i have two pumps i did drain and refill the spa when I replaced the main board and heater. don’t know how to check for air locks where are the gates/slice/T handle valves located (I don’t remember closing anything) sorry took so long getting back to you had a family emergency Quote Link to comment Share on other sites More sharing options...
RDspaguy Posted February 16, 2021 Report Share Posted February 16, 2021 2 hours ago, JackieK said: I replaced the main board and heater Has it worked since? Post a pic of the red and white switchbanks at the bottom of the board and the wiring diagram on the box cover. 1 Quote Link to comment Share on other sites More sharing options...
JackieK Posted February 17, 2021 Author Report Share Posted February 17, 2021 I will go out in the morning and take the pictures. Quote Link to comment Share on other sites More sharing options...
RDspaguy Posted February 17, 2021 Report Share Posted February 17, 2021 I found these in your other other thread. If this is as is I can use this. So, has it worked since the new pack was installed? Quote Link to comment Share on other sites More sharing options...
RDspaguy Posted February 17, 2021 Report Share Posted February 17, 2021 Does it have a 24 hour circulation pump or does it use pump 1 low for heating? Quote Link to comment Share on other sites More sharing options...
JackieK Posted February 17, 2021 Author Report Share Posted February 17, 2021 Here are some pictures that I just took. ‘it has worked since I had done all the other work. One time even saying LF and I added water and it was good. But now it’s been full did filter and everything but no luck so far. Quote Link to comment Share on other sites More sharing options...
RDspaguy Posted February 18, 2021 Report Share Posted February 18, 2021 Do your jets work as they should with the button? Remove filter. Check pump for debris in impeller. Switch the sensors at the plugs on the board. Test sensors with an ohm meter. Quote Link to comment Share on other sites More sharing options...
JackieK Posted February 20, 2021 Author Report Share Posted February 20, 2021 Ok I will do that this weekend. Just got home and work again tomorrow. Thank you for your help. Quote Link to comment Share on other sites More sharing options...
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