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I ordered a new bypass valve and o ring set. Tuesday or Wednesday I will update. Thanks for all the advice.

I think cleaning the coils is my next step. I think I have plenty of water flow. I can see it and feel it in the hot tub. It looks like it is moving at a pretty good pace. The out pvc also feels warm like 80 but not not like 100+. All the help has been awesome. It has helped me think through...

I just tested the thermal regulator again. It worked perfect. I restarted it. The water started at 79 and went to 81. At 81 the flue temp hit 393 and the heater turned off. What would be the next step? I would rather fix this heater but I am getting close to just buying a new one. Also when I...

I tested it. I also bought a Pentair one instead of generic even though they are probably the same. I will pull it out and test it again. Fortunately it is easy to get out. Thanks

When the water temp hit 80 the flue temp started rising to about 380 then the heater shut off. I let it sit for a few minutes and restarted it. It turned off at 336 stack flue sensor this time. It was making a quiet rattling sound at the manifold when the pump was running and the heater had...

The flue temp went to 359 at 78 water temp. It seems to go up a degree or two for every degree of water temp. I expect it to shut off soon since it is getting close to 80 water temp. I will reset the thermal regulator and see if it restarts and gets warmer.

I meant heater on the 40gpm. I fixed it. I will definitely try and reset the thermal regulator. It seemed like it had more spring pressure going in than coming out. It was 10 degrees outside when I put it in so I was hurrying. Resetting it is a great thought. Thanks

That reading material was good. I just checked the stack flue temp with everything set for the pool. Pump set at 1750. It got as hot as 352. It stayed around 350-352. Then I switched to spa. It went as high as 354. Pump for that was set at 2250. I am trying to heat up the hot tub now. It seems...

I have a new Hayward c3030 filter. Maybe two weeks old. I have not cleaned them yet since they are new. I have a Pentair VS pump. I haven’t measured the stack flue temp. I checked the ohms on the sensor and it was good. How do I check the temperature? Thanks for your help. This forum is great.

I think I am going to try and clean the exchanger inside and out. Any tips?

I have a pentair 400. When i try to heat up the hot tub it gets to 80 degrees, usually from about 60, and then i get an E05 code. The thermal regulator was stuck open so I replaced it with a new one. I thought that would solve the problem but it does the same exact thing. Will a bad bypasss...

I just bought a house that has a pool. I think we will enjoy it but it seems like I may have a steep learning curve. I had to replace the filter already and repair the heater. Hopefully it gets easier as I learn.