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Old 03-17-2011, 12:21 AM   #61
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Hot water problem - Figured out cause - Need advice how to fix!


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Originally Posted by the_man View Post
if there is a shut off valve next to the pump turn it off and see if the problem gets better. turn the power off to the pump before you do if it fixes it, then you have a problem with the check valve or you may be missing one
Thanks. I don't know if there is a shutoff valve. I will give what you suggested a try when I get back there (end of next week) and let you know if it worked.

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Old 03-17-2011, 11:04 AM   #62
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Hot water problem - Figured out cause - Need advice how to fix!


OK, so we checked the washing machine and it turns out the hoses were on back to front (hot and cold), but turning off the machine and switching those hasn't fixed the problem. Still having the same issue.

We found something else that was a bit odd. In the downstairs bathroom, if we leave the shower faucet running on hot and run the hot tap in the sink, the water in the sink comes out boiling hot and stays that way. At the same time, the water coming out of the shower faucet turns cold. As soon as we turn off the hot water in the sink, the water from the shower faucet warms up.

So, the guy thinks it could be a problem in the shower control unit? He is off to find a replacement spring and rubber part for that.

Any other ideas folks?
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Old 03-17-2011, 11:38 AM   #63
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Hot water problem - Figured out cause - Need advice how to fix!


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Originally Posted by kissiffer4 View Post
OK, so we checked the washing machine and it turns out the hoses were on back to front (hot and cold), but turning off the machine and switching those hasn't fixed the problem. Still having the same issue.

We found something else that was a bit odd. In the downstairs bathroom, if we leave the shower faucet running on hot and run the hot tap in the sink, the water in the sink comes out boiling hot and stays that way. At the same time, the water coming out of the shower faucet turns cold. As soon as we turn off the hot water in the sink, the water from the shower faucet warms up.

So, the guy thinks it could be a problem in the shower control unit? He is off to find a replacement spring and rubber part for that.

Any other ideas folks?
Well, replacing those didn't work either. He is at a bit of a loss now as to what is causing it. Wants to open up the walls behind both bathrooms/showers to take a look at the pipes. Starting to think he is guessing now.
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Old 03-23-2011, 10:22 AM   #64
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Hot water problem - Figured out cause - Need advice how to fix!


All, I had another plumber come in and take a look. He thinks our check valve is in the wrong position.

Here is a photo of our plumbing configuration next to our water heater:

http://www.flickr.com/photos/21503963@N04/5550135707/

On the far left is a 1/2 inch pipe, what we think is a return line. Next to that is the hot water pipe and to the right, the other pipe going in to the water heater is the cold pipe.

Now, behind the flue we have a check valve with an arrow pointing to the right ->, which is connected to the cold water line.

Does this make sense? He said that in it's current spot, there is a chance of water running up the pipe and into the water heater so it ought to be located toward the base of the water heater.

One last thing. The return line and cold pipe are warm if we don't run water for a while, but today I ran the hot faucet for a couple of minutes in the shower and went down to the basement to check and both the return line and cold pipe were freezing cold.

So...I'm wondering if this configuration is correct or if indeed the check valve is in the wrong place, or might need replacing?

Also, if it might be a mixing valve some place, where could that be? We tried turning off the water supply to the washing machine, but that didn't fix the problem.

Thanks all.
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Old 03-25-2011, 11:54 PM   #65
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Hot water problem - Figured out cause - Need advice how to fix!


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Thanks. I don't know if there is a shutoff valve. I will give what you suggested a try when I get back there (end of next week) and let you know if it worked.
There is a shutoff valve below and above the pump. Which one should I shut off or does it matter?
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Old 03-25-2011, 11:59 PM   #66
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Hot water problem - Figured out cause - Need advice how to fix!


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Originally Posted by the_man View Post
if there is a shut off valve next to the pump turn it off and see if the problem gets better. turn the power off to the pump before you do if it fixes it, then you have a problem with the check valve or you may be missing one
There is a shutoff valve before and after the pump. Which one should I shutoff or does it matter?
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Old 03-29-2011, 11:19 AM   #67
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Hot water problem - Figured out cause - Need advice how to fix!


All...just wanted to update you on this. One new check valve and ball valve later on the 1/2" line and the problem is fixed! We put a new working ball valve on the line and I am now to shut it off, which appears to have corrected the problem. We also added a new check valve on the 1/2" line, so maybe that helped. The old one that was removed doesn't rattle like the new one. Does that mean it was broken?

Also, anybody know why shutting off the 1/2" line would fix this problem? Now I'm wondering whether I might need it for something else! Also, even though it is shut off, will there be a build up of water pressure against it trying to come back into the water heater?

Thanks for all of the advice along the way
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Old 03-31-2011, 07:48 PM   #68
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Hot water problem - Figured out cause - Need advice how to fix!


It looks like I have the exact same problem as the OP. A plumber came out and changed out my recirculating pump and installed a new check valve but it did not fix the problem. I'm waiting for another plumber to schedule for a second opinion because the other plumber is stumped. If I unplug it and turn off the ball valves no problem. This afternoon while doing the laundry I tried it with the pump on and no problem. Without the washer running I tried it again. Turned the hot water on at the kitchen faucet and had my wife turn on the hot water at the master bathtub. Within a few seconds the water at the kitchen sink went cold and the pipes on both sides of the recirculating pump were freezing cold!
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Old 04-03-2011, 01:22 AM   #69
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Hot water problem - Figured out cause - Need advice how to fix!


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Originally Posted by willk53 View Post
It looks like I have the exact same problem as the OP. A plumber came out and changed out my recirculating pump and installed a new check valve but it did not fix the problem. I'm waiting for another plumber to schedule for a second opinion because the other plumber is stumped. If I unplug it and turn off the ball valves no problem. This afternoon while doing the laundry I tried it with the pump on and no problem. Without the washer running I tried it again. Turned the hot water on at the kitchen faucet and had my wife turn on the hot water at the master bathtub. Within a few seconds the water at the kitchen sink went cold and the pipes on both sides of the recirculating pump were freezing cold!
Looks like I spoke too soon. It is now working fine. I guess we just needed to give it more time to recirculate.

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