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    Mastertemp 400 Short Cycling

    Had the same issue with my Mastertemp 300..never got error codes and slowly started failing like yours. Replaced a lot of the sensors like you did, thermal regulator etc.., nothing worked. Mine was only a few years old as well. Always have balanced chemicals..took it apart and saw this...
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    Pentair MASTERTEMP weird burner cycling

    Same thing happened to my Mastertemp 300. No error codes, everything tested out OK, but kept cycling around 80-90 degrees. See my thread --> Mastertemp 300 - SOLVED! - Cycling - Maybe it will help? Ended up being a rusted tube sheet. Replaced it and now works fine.
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    Setting schedules on my Intelliflo

    Also remember a speed cannot be programmed with the same start and stop times. To run a speed without stopping, set the Start time one minute after the stop time.
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    Setting schedules on my Intelliflo

    Speeds 1-4 (at least on mine) are set for any manual speeds you may want. 5-8 are setup for schedules, but 1-8 can be setup as "scheduled". Make sure the speeds are programmed as scheduled not manual. If you select a speed 1-4 and then hit start/stop it will run that speed manually. If you...
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    Setting schedules on my Intelliflo

    Is the Start/Stop button selected on the panel. If you created a schedule you still need to make sure the pump is in "start" mode to run the schedules.
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    Mastertemp 300 - SOLVED! - Cycling -

    I ran it multiple times with it cycling and never saw any LED's. Even replaced the control board and still no LED's came on. It seems to be fixed though so I'll go with it. But like you I wish I would of seen an LED and then replaced the heat exchanger and saw it go away. There was quite a...
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    Mastertemp 300 - SOLVED! - Cycling -

    Been fighting a cycling Mastertemp 300 heater for most of the summer season. It would start to cycle once the temperature would reach around 88 degrees, cycle again and then eventually the service heater light would come on. This would occur when heating the spa or pool. So I: 1. Checked...
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    Winter vacuums

    I run mine a few times over the winter under the cover. Usually to pick up the worms that somehow find there way in
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    Robot Use In Winter?

    I use mine a couple times over the winter to clean up the worms/bugs/occasional leaf that finds it way under the winter cover. The cold water doesn't seem to bother it. I normally run a cycle or two and then remove immediately, rinse off and put back in storage. Also apply an chlorine/muratic...
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    New build in Michigan - Look over my quote please!

    Curious as to the "was not wowed"..what was not to your liking on previous builds by the builder? I assume you have a plan to dispose of all that dirt? I am in Michigan as well...we happened to find a local dirt bike track that was more than willing to take the dirt. Our pool is roughly the...
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    Pool light and bubbler light on separate switches?

    I can only add that we originally had our pool light and spa light all wired together. We had a problem during initial start-up and they ended up wiring them separately and I am very glad they did. It is nice to be able to sit in the hot tub and not have to see the glow of the pool during late...
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    Critique my Closing Plan

    I have the same setup with tiles on my steps , not as many as water line , but I have a couple of each step turned in a diamond shape. I have never worried about them and only drain water below the returns. This would leave them submerged and never had a problem
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    Critique my Closing Plan

    I'm in the same boat as my skimmer box cover is just "outside" of the cover and of course rain water etc will enter the skimmer over the winter. No problem. Just make sure you have a Gizmo, or cut up pool noodles in the skimmer box to handle any potential ice expansion. I happen to use the...
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    Ditching robots and going manual

    I said the same thing my first year with my pool!. Wait another couple of seasons and you may change your mind :). Dropping in that robot, walking away and coming back to a clean pool is life will/may never go back.
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    Suction-side Leak: How worried should I be?

    My pool is setup exactly the same. Its either the valve that controls spa/pool suction or the one that is downstream and controls the pool suction from main / skimmer. My issue was the pool/spa valve. Don't really know the culprit ..either lubing the o-ring, cleaning valve guts or tightening...
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    Suction-side Leak: How worried should I be?

    I had the same problem just yesterday and took apart my suction side valves, cleaned and removed O-rings, lubed O-rings, put everything back together, tightened screws and now no bubbles and basket holds water when off. My "running water test" showed nothing either (probably did not hit that...
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    One Year Old SWG Reports Low On Salt

    Just an idea --sometimes at spring startup when my Intellichlor salt cell still says low salt (usually due to cold water), and then the water gets above 70 and it still says low salt I will trip the breaker for the cell (in my mind kind of like a reboot) and then start it back up and the low...
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    Doheny's Discovery, S200, Active20, Triton owners club

    Re: Doheny's Discovery, S200, Active20, Triton owners club And of course the dog thinks it is an intruder attacking the family because it chases it around the pool and tries to nip it when it surfaces for it's attack on the tile!
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    Doheny's Discovery, S200, Active20, Triton owners club

    Re: Doheny's Discovery, S200, Active20, Triton owners club So have been debating for a year or two to get a robot or not. Was the "hey manual vaccuming is fun and I get alone time from the kids". Well I was dragging out the hose this spring and finally said "you know what not fun anymore!"...
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    First for me...Dead mouse!

    We have a local "small lake" aka large pond that many families venture to over the summer, for that matter any lake really. Been swimming in it for years, so does everyone else, no one has ever got any "deadly critter" diseases :) . Can only imagine how many dead animals, dead fish, leaves...
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    Spa draining to pool lvl when pump is off.

    Turn the suction valve 100% to pool and the return valve 100% to spa (or in your case I think turn off completely the pool return valve, and turn the spa return 100% on). Turn on pump, this will fill the spa. Once at the desired level, turn off pump and move spa return valve to off and turn...
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    Spa draining to pool lvl when pump is off.

    Also there a check valve in the pool suction line (pool line going into the pump suction)?. Since the spa is higher than the pool any time the suction valve is drawing from both spa and pool, water will flow backward in the pool suction line and drain the spa. Just a thought? Although as...
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    Spa draining to pool lvl when pump is off.

    Right..the check valve on the spa return. Does the water seem to be going back in to the pool when draining from the spa..can you tell? If the pump is running and you turn the valve that controls return water to the spa position and then the suction valve to the spa, is the water level still...
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    Spa draining to pool lvl when pump is off.

    Is the spa higher than the pool?, if so the water will level to the pool level if no check valve is installed.
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    Pentair Mastertemp 250 Natural Gas

    Had the same issue with my Mastertemp 300 heater. It would heat up to 90 and then cycle on/off. Turned out to be this part --> : Pentair 77707-0010 Thermal Regulator Replacement Kit Pool and Spa Heater : Portable Outdoor Heating : Patio, Lawn Garden The Thermo regulators in these...
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    Heater issue

    On the back. Actually thermo regulator. Down low. Looks like a 2 inch black circle that screws out. Need to put a screwdriver blade on it to gain leverage to screw it off. If it looks rusty it is bad. Won't allow the spring to move when it gets hot/cold and it makes the heater shut off. Do...