Jawendel99

Finally had the chance to check it again. I didn't get a voltage between the terminals (temp was down to 91 degrees in the tub). When you say probably a burned out relay, I didn't see a relay in the wiring diagram. Can I just replace a relay, or do I need to replace the whole circuit board? Heater continuity was good.

Ok, so I got the numbers. They are both 17.6 on the 20K reading, so 17,600 ohms, correct? Also, I checked the pressure switch again. The heat light is on, even when it's not up to temperature. When I unplug the pressure switch the heat light goes off. When I plug it back in again the heat lamp goes back on.

Sorry, it's on "Standard" not "Standby" - my bad. I checked the incoming voltage and it's at 236V with my cheap voltmeter - so we're good there The pump is always running, so when I unplugged the pressure switch the pump continued to run as normal. When I plugged it back in the heater didn't turn on. I cut the power and pulled the sensor plugs but couldn't get an ohm reading on either one - either my probes are too big so it didn't go all the way into the plug, or there is no resistance (not an electrician, but I think that's how it works)

The only options I have are "standby" or "econ" - when it's on "econ" it doesn't even get to temperature. I haven't seen it drop below 80, but don't know if I've just caught it before then, or if that's where it settles. I had both pumps replaced in the last year, but it was doing this last year too. The pump does run constantly when it's stopped heating. RDSpaguy - I do have a multimeter. thanks for the things you mentioned to check. I'll check those and report thanks

There aren't any errors on the display. I have it set to Standby, not economy, so it should stay up to temperature, right? I've cleaned the filters and replaced the filters, but no help. See attached pic's of my circuit board and wiring diagram

I bought a home a year ago with an existing Hot Tub. The previous owner used a water treatment called "Water Tonic" from Clear Water Choice. Said that's all he uses. It's an enzyme that keeps the water clean. Does anyone have experience using it? Any suggestions?

I have an LA Spa's year 2004 or so hot tub that, when it's cold outside will heat up to the max (104) degrees, and then after a day it drops down to around 80. The only way I can get it to go back up is to shut off the power to the hot tub and turn it back on again. Then it takes about half a day to warm up again before it gets up to temperature, then it's down to 80 again a day later. Any ideas?