LA Spa blockage

[David TO]

I noticed that my Spa wasn't heating up well, it was getting warm, even hot but not has hot as it should. The heat unit is a couple years old and it is working.  The pump fine is working and the water is moving well when turned all the way on.

What I did notice is that I removed the three canister filters I notice that with the filters off the pull/suction where the filters screw in is faint.  What I've always found in the past is that this suction is really strong, not now. 

Trying to see what would cause this to not be strong?  Not sure if its a blockage or not.  Any suggestions would be helpful.

 

[CanadianSpaTech]

6 hours ago, David TO said:

Trying to see what would cause this to not be strong?

Has the suction increased in the foot well pump return/suction covers when the spa is running in low speed? It is possible there is a one way check valve that has broken or stuck open. When the spa is running in low speed the water gets sucked in through the filters and the check valve remains closed. When the spa is put into high speed the check valve opens and pulls the extra water needed to feed the pump gets pulled through both the filter AND the footwell. If it has broken or is stuck open then it won't pull very hard through the filter. This is one possibility and only accounts for the low suction but not for heating slowly. Some spas have them.. some don't.

Does the spa heat and filter using pump 1 or is there a circulation pump?

Do you get any error codes on the topside?

Post photos of the circuit board and the schematic on the inside cover so we know what you have.