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It is actually a mini max plus 400. It is an older unit. Both knobs, on made to direct to spa, one to pool both having same behavior at the same time.

OK, I ordered a brand new thermistor probe and installed it. I really thought this had to be the issue. Unfortunately, the heater is doing the same thing. It is only clicking on when I turn the knob pretty close to full heat. it seems like it’s not recognizing lower temperatures. Does anyone...

Below is a picture of my unit. All of a sudden, the heater will not kick on unless the dial is turned all the way up to the last units.

I typically try to keep my pool heated at around 85°. Today, I noticed that the pool was cooler as the heater was not maintaining the temperature. When I turned the dial up on the heater, it did turn on. It just seems that the temperature is not being read correctly. Usually, I turn the dial...

I will try to reset the switch tomorrow. I did not notice that. If this is the case, is it possible that there is debris causing it to overheat? Is it possible to open up the blower to see what’s going on inside and if it needs to be cleaned?

Tonight I was enjoying my hot tub and suddenly the blower stopped. It is old. When I came over to it, it was not making any noise and I flipped the switch back-and-forth. I am going to mess with it tomorrow and start by testing the electricity. I doubt this is the problem because it is on...

Thanks for everyone’s help. I had success today. I replaced the valve and now it works. The old valve did indeed have alot of debris in it looking through the outlet when I removed it. I’m sure that has built up over many, many years. Checked all my joints with soapy water to ensure...

OK. Just checking in with update. I got a hold of a manometer. I tested the inlet side and it read 8. I tested the outlet side with the heater turned on. Nothing but clicking, I can see piolet flame, and the outlet side is reading 0 on manometer. My deduction from this test is that the...

Good advice. I’ll pick up a manometer before I buy the valve. Do you know the ideal measurement? I think I see on the picture that it needs to be between three and five.

Thanks for this information. This is a likely culprit to why the valve would be stuck.

I was able to get a crossover sheet from Honeywell attached and I believe this references the correct universal part and a couple competitor parts that also crossover. I assume that I would be safe to replace it with the univerasal or competitor? Having my sediment trap in the wrong place...

One more question. I am considering replacing I just looked up vr8304k4814 to replace and they seem to have limited availability and skyrocket price for those that are out there. Does the VR Universal cross over to it?

I’m not sure what to look for with the sediment trap, but I’m guessing this drop-down pipe could be set to catch sediment. I also just tried cleaning all the electrical connections. It did not fix the problem.

Thanks for the advice and info. I do not own a manometer, but I am thinking it is probably the valve because it was running fine for about three hours and then just switched over to clicking with no gas. Seems like the gas pressure would not of changed sporadically (Just a theory). I...

I thought I would add this picture as well. I’m thinking that it is this area that is not opening the valve to allow gas to go through the main pipe once the pilot is activated.

I have a mini max plus 400 heater that has been around for about about 20 years. I was having problems with it and recently replaced the flame sensor/fire sparker mechanism, and it has been working great ever since until today. Today, I was heating the pool and it was heating fine until it...

See pictures. I had success. One thing I learned, I hate digging holes. Especially when there are crêpe myrtle trees in your yard with roots. All the leaking flex pipes removed and new PVC in. The pool now holds prime much better and does not suck air in pump…. not to mention it now does...