Jawendel99 Posted January 9, 2021 Report Share Posted January 9, 2021 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? Quote Link to comment Share on other sites More sharing options...
RDspaguy Posted January 10, 2021 Report Share Posted January 10, 2021 Are there any errors on the display? Check your filter cycles and mode, if in economy with low filter times it will not be able to maintain temperature. Post a pic of your circuit board and wiring diagram. Quote Link to comment Share on other sites More sharing options...
Jawendel99 Posted January 11, 2021 Author Report Share Posted January 11, 2021 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 Quote Link to comment Share on other sites More sharing options...
RDspaguy Posted January 12, 2021 Report Share Posted January 12, 2021 Have any repairs been done to it recently? Does the pump run continuously when it has stopped heating? Do you have a multimeter? Test incoming voltage from the breaker when the spa is below set temp. Test red to black for 240v. When the spa is below temp, before you would reset the breaker, disconnect the pressure switch wires from the board with some needle nose and see if the pump turns on. If so, plug it back in and see if the heater comes on. If so, replace the pressure switch. Turn off power and unplug sensors. Take an ohm reading on each sensor. Post results. Quote Link to comment Share on other sites More sharing options...
CanadianSpaTech Posted January 12, 2021 Report Share Posted January 12, 2021 12 hours ago, Jawendel99 said: I have it set to Standby or standard? When it gets to 80 does it maintain 80 or does it go below 80? Quote Link to comment Share on other sites More sharing options...
Jawendel99 Posted January 13, 2021 Author Report Share Posted January 13, 2021 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 Quote Link to comment Share on other sites More sharing options...
Jawendel99 Posted January 13, 2021 Author Report Share Posted January 13, 2021 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) Quote Link to comment Share on other sites More sharing options...
RDspaguy Posted January 13, 2021 Report Share Posted January 13, 2021 You can remove the wires from the plug by depressing the tab in the slot on the bottom of the plug with a small screwdriver. Quote Link to comment Share on other sites More sharing options...
Jawendel99 Posted January 15, 2021 Author Report Share Posted January 15, 2021 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. Quote Link to comment Share on other sites More sharing options...
RDspaguy Posted January 15, 2021 Report Share Posted January 15, 2021 Test voltage at the heater terminals. If there is not voltage between the 2 terminals then your circuit board is bad. Probably a burned out relay. Test heater for continuity (power off). If you do not have continuity the heater is bad. 1 Quote Link to comment Share on other sites More sharing options...
Jawendel99 Posted January 26, 2021 Author Report Share Posted January 26, 2021 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. Quote Link to comment Share on other sites More sharing options...
RDspaguy Posted January 26, 2021 Report Share Posted January 26, 2021 Bring the board to an electronics/computer repair guy. Quote Link to comment Share on other sites More sharing options...
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