JimH Posted February 7 Report Share Posted February 7 I have a Cal Spa Gen II LTR20151000. Model = M-S15-Z630L-B It heats up and runs fine, but at random will stop heating. Simply pushing the heat up or down arrows on the control panel and it will start heating again. May run for Zero to 40 days before it stops heating again. It's like the spa doesn't think the heat needs to come on until you give it some outside coaching (up/down heat arrows). Seems totally random, can occur at any time, colds days or warmer days, so doesn't seem to be related to how much the heater is running. Quote Link to comment Share on other sites More sharing options...
CanadianSpaTech Posted February 8 Report Share Posted February 8 Is it mode related? Are you in "Standard (st). Economy (eco) or sleep (SL) mode?. In economy mode it will only heat the water back up to the set temp during the filter cycle normally set at 2 hours 2X per day AM /PM. The 10 hours in between filter cycles if there has been heat loss it won't turn the heater on until the next filter cycle starts. Push temp up in between filter cycles it will override the ECO mode and start to heat. St will keep it at the set point always. SL will wait until spa temp gets down to 80 and maintain 80 degrees. Quote Link to comment Share on other sites More sharing options...
JimH Posted February 10 Author Report Share Posted February 10 It's set to standard. Well this model only has 2, 'Ready' and 'Rest'. Ready is normal. Rest will only run during programmed filter cycles. It is in Ready mode. Thanks 1 Quote Link to comment Share on other sites More sharing options...
JimH Posted March 24 Author Report Share Posted March 24 Checking if anyone has had an issue like this before I change the heater sensors. I've been running the spa at 95 degrees and still get HTR TOO HOT message spradically. The odd thing is it will heat from 65 to 95 just fine. It's only after it starts cycling to maintain 95 that it sporadically gets this message. Trying to figure out if it is the sensors or the mother board. Thanks for any advice. Quote Link to comment Share on other sites More sharing options...
cranbiz Posted March 25 Report Share Posted March 25 It could be the sensors or it could be the flow switch/sensor. I would test the sensors with an ohm meter first before just swapping out sensors. Quote Link to comment Share on other sites More sharing options...
JimH Posted March 26 Author Report Share Posted March 26 Thanks for the advice. Looking into the flow sensor. Will testing the sensors with an ohm meter work if the problem happens sporadically? My thought is I'd only get bad ohm reading at time of failure/shut off. It will be almost impossible for me to catch it happening. Thanks again for the advice. Quote Link to comment Share on other sites More sharing options...
cranbiz Posted March 27 Report Share Posted March 27 The flow switch should be an off/on switch but sometimes they will get intermittent or crap in them which prevents the 0 ohm reading. For the temp/limit sensors, they should read in the 10's of K range and if you have multiple sensors they should be close to each other in their readings. Quote Link to comment Share on other sites More sharing options...
JimH Posted April 2 Author Report Share Posted April 2 Thanks for the info. I checked with CalSpa support and I don't have a flow switch on this model. Just the two sensors in the heater. I'll check those with an ohms meter as you suggest above. Quote Link to comment Share on other sites More sharing options...
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