Strange heat issue on QCA

[Rossi234]

Hi guys, first post here and I am a bit stumped.

QCA spa I have had since 2004. No issues I could not repair until now.

I drained and refilled the tub to change out the water last weekend (I do this monthly).  Everything seemed fine and I went to go in 3-4 days later.  Temp was only 91.  Heat indicated was on steady, no error codes, jets seemed fine.  I figured it may have air locked, but it has never done this before so I burped it at the pump union.  Still no rise.

Next step was the filter.  I removed it and let it run and the temperature shot right up to 104 in a few hours.  Thought I had it so I replaced the filter, which was fairly new and pretty clean.  Came back a couple of days later and I am at 97. Temp set for 104.  Water temp is accurate at 97.

What could suddenly cause the presence of a filter (new or older) to restrict the heat?

I should also note that I checked all the settings and the circ pump is running 12+ hours per day, not on economy mode, and both speeds on the pumps seem to have normal flow through all jets.

i replaced the heating element 3 years ago, and both pumps are witching 2-4 years old.

Any ideas?

 

 

[Dr. Spa]

Pressure switch vibrated out of adjustment?

[Rossi234]

Thanks for the reply.  I just rotated the pressure switch wheel adjustment.  It seemed tight and unlikely to move, but I will see what happens.  I also checked all wires to switch, sensor, etc. all look good,. I also shut off breaker and turned on to reset everything.