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The heater is currently in a fault mode so has stopped heating the water.
LF means Low Flow, this is normally due to a sensor fault. Have you seen any other messages appear such as HL?
It could be one of a number of sensors, check the output and return sensors.
This will be connected on the outlet and return pipes close to the heat source.
The service manuals dont state specific locations as they are based on the control panel rather than a specific spa design.
Run the spa, disconnect the terminals to the sensor and check the resistance, then do the same to the return.
Let me know the ohm readings of each.
Just wanted to follow up to see how you got on?
Do you require any further assistance?
If its not the sensor from the heater it must be the sensor from the pump side, as LF is showing an imbalance between the two sensor inputs.
Trace the cables from the PCB back to the pipes, I will await to hear back from you.
Hi Chris, I just wanted to follow up to see if you needed any further assistance?
I would base the efficiency of the heater on the temp of the outgoing water rather than the temp emitting from the heater, as you may find by cleaning the pipes you have increased flow rate thus the heat from the heater is being expelled fast and not building up.
Appreciate if you can rate the service received using the star rating on this page, and let me know if I can be of any further assistance.
Good morning, I havent heard back from you please use the star rating at the top of the page to rate the service received so I may close the case, or let me know if you need further assistance.
Hi Chris, So I can close the case please use the star rating at the top of the page, to rate the service received.