No hot water

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Old 09-14-20, 02:09 PM
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No hot water

Hi, I have an oil fired boiler, and I am getting no hot water. It seem to be hot on the pipe from the boiler to the mixing valve,(right side in picture) but not on the other side (left side). Also Seems hot on the pipe between the boiler and relief valve, but not below it. The boiler will not kick on no matter how long I run the water. The heat works, the heat pipes get hot, and it seemed like I had a little hot water after I ran the heat.
any suggestions? Thank you for reading.

 
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Old 09-14-20, 02:25 PM
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Hi, do you have a separate tank, or a coil in the boiler, post more pics of the setup.
Geo
 
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Old 09-14-20, 02:32 PM
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Coil in the burner. I will snap some pics
 
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Old 09-14-20, 03:01 PM
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I turned the top dial a tiny bit, the burner fired up, the pipe from the boiler to the mixing valve got hot, the one on the opposite side did not get hot, no hot water in the house still.
 
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Old 09-14-20, 03:04 PM
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Old 09-14-20, 03:55 PM
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So, i tried something. I shut off the cold water TO the mixing valve and I get NO water at all. Is it possible that the valve is clogged? The pipe that connects to the hot side is hot. It seems like the hot water is not getting through the valve. the water in this town is actually terrible, it ruins everything. The hot water feels a little warmer than the cold. The burner does turn on. The heat it turned off and I was wrong, I do NOT get hot water when the heat is on. i must have been imagining it. I banged the valve a little with a pair of pliers and the water came out brown.
 

Last edited by frankjc; 09-14-20 at 06:35 PM.
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Old 09-14-20, 05:19 PM
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Old 09-14-20, 09:45 PM
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Your boiler water is plenty hot enough. Your problem is the mixing valve.
Some can be taken apart and cleaned and others need to be replaced.
 
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Old 09-15-20, 05:50 AM
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Your high and low setting aren't correct either. The low should be at least 20 degrees lower then the high. With that said, the mixing valve is most likely your issue, or a clogged coil.
 
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Old 09-15-20, 08:46 AM
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Thanks, I will fix that. I think it got changed when I was playing with it.
 
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Old Today, 12:01 PM
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Ok, I have the repair kit for the valve. I didn't think I was going to be able to get it apart, but I was able to crack it loose. What is the process in replacing this part? Looking at it I can't see how it attached to the bonnett. Do I have to disassemble the whole thing? The instructions on their website are not very clear.. I don't have it apart, just looking at pics on the internet, and the new part.
thanks
 
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Old Today, 12:16 PM
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Pretty hard to comment when we can't see what you are looking at.
A link would be helpful.
 
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Old Today, 12:24 PM
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Sorry, my mistake. It's a watts 70a
 
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Old Today, 02:28 PM
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I replaced the part, cleaned out the inside best I could, still same problem. The strange thing, it won't fire up to make hot water unless I turn the lo control on the aquastat past 180. When I was poking around the other night that happened too. Wasn't sure what to make of it.
i flushed the water at the relief valve until it came out clean.
the pipe on the left which goes to the hot side of the valve is hot, but is much hotter above the fitting in the middle.

 
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Old Today, 03:21 PM
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Look at the gauge. That is the current temperature of the water in the boiler and the heating coil.
 
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