HI AND HELLO! I HAVE AN ARTISAN MERLIN TUB. AFTER THE TUB REACHES TEMPERATURE SETPOINT THE PUMP WILL BEGIN TO CYCLE ON/OFF EVERY 3-5 MINUTES WITHOUT THE HEATER COMING ON. IF THE TEMPERATURE SETPOINT IS WELL ABOVE ACTUAL WATER TEMPATURE THE PUMP WILL STAY OFF, COULD THE TEMP PROB. BE GOING? PLEASE HELP ME BEFORE I POST, HOW DO I REPLACE A BURNED OUT PUMP MOTOR!!!

not to worry, your pump motor won't burn out. Sounds as though the water is cooling in the vicinity of your temp probe, pump kicks on and brings warmer water past the probe telling it's up to temp and shutting off. But this is just a guess, as I'm no Artesian expert. Without a definitive answer here.....call your local dealer.

Are the Vermont lakes ready for icefishing?

hi master,
I have the exact same problem you do. I have a Balboa spa pac lite with topside control. I think the model # is mas125. I just got a new motor (century A/O smith model # bn61) and hooked it up and the temp heated from 45F to 101F in 6.5 hrs (pretty fast) but now the temp goes from 102 to 101 to 100- heat kicks on then. 3 to 5 minutes later the temp is back to 102 and shuts off then 5 mins later it goes to 100 again. I checked the temp probe which is built into the wall of the spa- it seemed to be ok. I also angled the jets away from the temp sensor so there would be no false reading. I can't figure it out. It could be the new motor I think the old motor turned in low about 1850 rpm and the new one does 1725. I dont think thats it because the flo is ok from the jets. Does anyone have any suggestions for master and I ???
ps sorry for the long post but its better to give too much information than too little.
thanks for you time

In the old days, when mechanical thermostats were the norm, heaters had a "deadband" of around 4-6 degrees. This meant that the temp would fluctuate that much between heat on and heat off. On today's electronic thermostat controls, the "deadband" is only 2-4 degrees. What you have described sounds completely normal.

To help maintain your spa's temperature better when you are using it, turn your air inducers to the closed position, and if you have a blower, don't use it. Air induction quickly cools the water.