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Thread: Difficult to set tub temperature
05-13-2014, 12:40 PM #1
My tub is getting tough to set the temperature to any fine degree. It's been that way for a while, but I was able to set it for 100 degrees and we're happy with that. But lately it was dropping, and got down to 95. It still functions correctly, in that the heater/pump turn on at 94 and off at 96. But when I just touch the control up a hair, it shot up to 105 and goes +/- 1 deg from there. Touch it again and it's down to 95 again.
Is this the topside panel, which is digital, or something in the main box in the base?
05-13-2014, 12:58 PM #2
That is a very difficult question to answer. It may be the topside but it also could be the circuit board. I am leaning more towards the topside though. Most technicians have spare topsides to plug in and test.
05-14-2014, 06:06 AM #3
It turns out it was the topside panel, and a real easy (and free) fix. Last night the temp dropped down to 90, so I nudged the control up a bit. This time the heater/pump started clicking on and off rapidly. I let it go for a bit, hoping it would settle down, but it didn't. I had to do something because this kind of activity is real hard on the pump and relays. So then I remembered the good old days playing with different electronic equipment.
The components behind those control knobs are usually variable resistors, or something called potentiometers, and they sometimes get dirty. When they acted flaky I would just turn the knobs back and forth to wipe off the contacts and all would be good to go.
I figured it wouldn't hurt here to try that and voila!, it's working normally again. I also noticed that when it was doing the clicking thing the setting was close to the max, like 13 out of 15 "steps". After cleaning it out, it turned on, nice and steady, at about 8 and now each step corresponds to about 1 degree, as it should.
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