Water heater recirculation pump not functioning

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Old 10-16-13, 05:32 PM
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Water heater recirculation pump not functioning

My recirculating pump has quit doing it's job. The pump is good that I know but there is no longer instant hot water throughout the house. If the pump is good what might be causing it to not work correctly?
 
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Old 10-16-13, 06:11 PM
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How do you know it's "good"?
 
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Old 10-17-13, 09:18 AM
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Well a couple ways. Removed it and replaced with a brand new one. Still no instant hot water. Second way I took both pumps plugged them in, put the inlet spout underwater in a bucket and they both pumped like the dickens.
 
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Old 10-18-13, 03:40 PM
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Do you know where the far end goes? Usually there's a shutoff valve there that may have gotten accidentally shut off.

Also, can you hear it running? Is there a timer or temperature sensor that may be faulty?
 
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Old 10-21-13, 09:27 AM
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Far end?

Far end as at the point in the house furthest away from this location? The pump works. It's brand new. I've had two different plumbers over telling me that I needed to change this pump. I did and still no workie. There is no temperature sensor it is either running or it is not.
 
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Old 10-21-13, 10:01 AM
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Going with the assumption that the pump works properly, there has to be another issue. With a water-heater-based recirc pump, the line coming off the pump should go to one of the fixtures on the far end of the house. As the water cools in the hot water pipe, the pump turns on and 'sucks' the water from that fixture far across the house, replacing the luke-warm water in the 'hot' pipes with hot water.

The ones I've seen always have some kind of thermostat so they don't run all the time, only when the water cools, though there may be others out there that run 24/7.

So if the pump is good, something must be preventing the water flowing through that loop.
 
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Old 10-21-13, 10:19 AM
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Hrm... I just learned something new about recirculation pumps. Apparently the older ones required a separate line to circulate the water. The newer ones have a special valve at the furthest fixture that allows the hot water to backflow into the cold water pipe.

Do you have one of those stop valves? If so, maybe that's what's gone bad.

Instant Hot Water Recirculating System - What's New - Watts
 
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Old 10-21-13, 10:46 AM
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Most likely the check valve is bad. It should be on the line somewhere near the pump....

You may be able to open and clean it out....

 
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Old 10-23-13, 08:17 AM
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There is no valve near the pump that I'm aware of. A line comes off the bottom of the water heater it's connected to the drain valve (see image) goes into the pump then into the wall. Either the water is forced through the wall or forced back into the water heater. I'm not entirely sure of the direction of flow right now. I have a co worker that told me he has the same pump and he had to replace some item in one of the shower faucets. Said that made his start working again?
 
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Old 10-23-13, 08:26 AM
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Do you have thermostatic valves in the home? Meaning the shower has two handles...One for on and off and one for temp control????

You need to remove the insulation to see whats under there...
 
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Old 10-29-13, 03:56 PM
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No both showers have single handle left for hot right for cold.
 
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Old 10-29-13, 04:00 PM
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I say check valve if the pump is good... You need to look around for it....

Did you test the pump?
 
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Old 10-30-13, 07:39 AM
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Yes pump is brand new. Checked the old one in a bucket and it pumps as designed. Question. If I removed the pump from the line it's installed in shouldn't the water start to flow out of the line? With pressure from the city supply I can remove the pump and I get no flow of water from the open line.
 
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Old 10-30-13, 07:42 AM
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I can remove the pump and I get no flow of water from the open line.
From either end???----------------
 
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Old 10-30-13, 07:47 AM
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Remove that foam from the pipe from pump to drainvalve and take a pic...Take a pic of the top of water heater too.

Also put a bucket under the drain valve at heater and drain some water out..

If the drain valve drips for some reason after close it best you can a put a hose bib cap on it..

Have one available before you drain some out.. Let me know.

Oh and have you looked under any of the sinks for a return valve? Sometimes there is one....


 
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Old 11-06-13, 10:07 AM
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I'll post those pics in a few hours. As for the return valve. Would it look something like the check valve you posted in this thread? I'll look under the sinks but typically all I see there are hot/cold supply lines and drain pipes.
 
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Old 11-07-13, 04:54 PM
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Ok lawrosa got them pictures
 
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Old 11-07-13, 06:39 PM
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I dont think that pump has a built in check vale.. Can you get the # off it?

Why dont you take it off the timer and turn the swith under the cap to on...

Does the pump hum?

Did you drain water out the drain valve?

That set up IMO would need a check valve somewhere... baffling...
 
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Old 11-08-13, 08:37 AM
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Have not had the chance to drain the WH yet. I'll do that this weekend. Here is the pump. The pump works, both pumps work it has to be something else. This whole system used to work fine then it just quit functioning. I'll check the farthest sink from the WH and all the sinks for that check valve this weekend.
 
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