Question about Grundfos Comfort System Recirculator 595916

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Same problem as another writer described: the Grundfoss comfort system for hot water only. I do not get instant hot water as the last pump (until it quit working). The pump gets very hot. I "bled" all the faucets as someone described. It still takes too long to get hot water! Ready to take the pump back. Understand the timer, settings as well as my husband b/c we had the first one 8.5 yrs. Must be defective? It does eventually get hot, but still takes too long based on first Grundfos. Pls. advise. And thank you! Lynda

Posted by Anonymous on

1 Answer

If the pump is hot, the motor has overheated and will stop working. There's no cure for motor at this point. Be sure to de-lime and de-scale re-circulation pumps occasionally.
Return pump and exchange for new. Sounds like you already diagnosed the problem correctly.
http://waterheatertimer.org/Water-heater-recirculation-system.html

Posted on Apr 10, 2011

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I have an instant hotwater system with the futher most bathroom about 45' away. I am looking at adding a recirculating pump on a timer at the furthermost bathroom to get hotwater quickly in the...


Maybe I am not understanding your problem exactly, but if you have the instant hotwater system installed it should be measuring the temperature of the water in the hot water line and if it drops below the set level it should open the hot water side until the temperature is reached. If it was installed correctly it puts the hot water back into the cold water line so it isn't wasted.

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Laing model 330 Pump not working-delay in hot water delivery.In the past,a vibration occurred when cold water running above the pump.Can this be repaired.Power operating to pump. Thanks, mel ross


Question not 100% clear.

1) The pump is not working? Does the pump make a noise? if pump is not working full-time, it can cause delay in arrival.
If pump motor is suspect, and outlet has power, then check override switch located on timer. Set override to Timer, move some of the trippers outward, then manually rotate timer dial until pump turns ON.
http://waterheatertimer.org/images/IMG_9325-grundfos-timer-800.jpg
If no noise is detected, or noise stops and starts, or seems strained, or if pump is hot, then pump motor may have burned out.

2) If pump is working, and makes noise like a humming sound, and pump motor is not hot, but hot water is not circulating, then unplug pump so it will not overheat and burn up.
Disassemble the pump and cross-over piece. Clean piping with white vinegar or CLR. Do not soak in CLR or it will damage seals. Rinse parts thoroughly. Reassemble and see if problem is resolved.
If pump is vibrating, then suspects include sediment and/or air inside line, and this can be resolved by cleaning as described. Also install air vent to increase life of pump.

3) Other causes for hot water delay at faucet are crossover.
Crossover can be caused by bad single-handled faucet cartridge, and/or by clogged-or-failed check valve on cross-over piece on grundfos.
This type of problem lets cold water enter hot line, and causes delay in arrival of hot water. Clean-or-replace the grundfos cross-over piece, and replace bad faucet cartridge.
Open following link for testing instructions:
http://waterheatertimer.org/Crossover.html

Resources:
http://waterheatertimer.org/Water-heater-recirculation-system.html
http://waterheatertimer.org/pdf/Troubleshoot-recirculation.pdf

Add a comment for more help.

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Sep 17, 2011 | Laing Thermotech Autocirc Undersink...

1 Answer

Pump not working-delay in hot water delivery.In the past,a vibration occurred when cold water running above the pump.Can this be repaired.Power operating to pump. Thanks, mel ross


Question not 100% clear.

1) The pump is not working? Does the pump make a noise? if pump is not working full-time, it can cause delay in arrival.
If pump motor is suspect, and outlet has power, then check override switch located on timer. Set override to Timer, move some of the trippers outward, then manually rotate timer dial until pump turns ON.
http://waterheatertimer.org/images/IMG_9325-grundfos-timer-800.jpg
If no noise is detected, or noise stops and starts, or seems strained, or if pump is hot, then pump motor may have burned out.

2) If pump is working, and makes noise like a humming sound, and pump motor is not hot, but hot water is not circulating, then unplug pump so it will not overheat and burn up.
Disassemble the pump and cross-over piece. Clean piping with white vinegar or CLR. Do not soak in CLR or it will damage seals. Rinse parts thoroughly. Reassemble and see if problem is resolved.
If pump is vibrating, then suspects include sediment and/or air inside line, and this can be resolved by cleaning as described. Also install air vent to increase life of pump.

3) Other causes for hot water delay at faucet are crossover.
Crossover can be caused by bad single-handled faucet cartridge, and/or by clogged-or-failed check valve on cross-over piece on grundfos.
This type of problem lets cold water enter hot line, and causes delay in arrival of hot water. Clean-or-replace the grundfos cross-over piece, and replace bad faucet cartridge.
Open following link for testing instructions:
http://waterheatertimer.org/Crossover.html

Resources:
http://waterheatertimer.org/Water-heater-recirculation-system.html
http://waterheatertimer.org/pdf/Troubleshoot-recirculation.pdf

Add a comment for more help.

Take a moment and rate answer for accuracy:
And take advantage of fixya expert assistance live.
For a price, expert works with you while you work on water heater or any do-it-yourself project.
Fixya is always less expensive than a service call.

Sep 17, 2011 | Laing Thermotech Autocirc Undersink...

1 Answer

How to descale machine-is there a video showing how? I have the Saeco Magic Comfort + machine.


Hi
I put this next statement in so your machine will last longer.
Enter the menu by pressing the menu button. Scroll down until you reach "water hardness" and then press the menu button to activate. Scroll down to the hardness of your water (chose 4 to be safe) and press the menu button again for the computer to remember. Push escape (esc.) and scroll to "Descale) about 4 up from water hardness, and push enter.
To descale your Magic Comfort +, enter the menu and scroll to descale. Push the menu button to descale. Mix your solution in your water tank. Use warm to hot water and dissolve all the solution. Place the water tank on your machine. With a container under the steam wand that is large enough to catch all the water in the tank, you are ready to begin. To start the descaling process, open the steam knob. The machine will automatically start the descaling process and when it is finished, it will shut off and tell you that it needs to be rinsed. Remove the water tank and rinse with fresh water. Refill the water tank and place it on the machine. Turn off the machine, wait a moment, and then turn it back on. Press the hot water button to start pumping fresh water through the boiler. Pump out about 16 oz. of water and then turn off the hot water button and open the steam knob to rinse the steam boiler. When it starts to go to steam, turn off and turn on the hot water button again. Pump out another 16 oz. Repeat this process with the steam knob until you have emptied the water tank. Descaling is complete. Go to your menu and scroll to "reset descale", push the enter button and chose "Yes" and push the enter button. Now it will tell you we next to be descaled.

Feb 14, 2011 | Saeco Magic Comfort Plus Espresso Machine

1 Answer

Grundfos recirculating system. Never has produced semi instant hot water at sink it is installed on. Could the original comfort valve be defective


http://waterheatertimer.org/Water-heater-recirculation-system.html

The circulation system should draw hot water directly from the water heater as shown on illustrations on link above.

The Grundfos pump works on a thermostat, and some work on a timer.
Can you hear the pump working?
There should be a humming sound.
Check the timer -or- thermostat setting.

It is possible the lines are clogged with sediment if you have hard water.

If I was going to fix the problem:
1) check thermostat or timer
2) listen for pump sound
3) check electricity going to unit
4) take apart the pipes and inspect for clogging
If there is a clog, I would flush the line or soak the part in CLR (calcium lime rust remover)

The circulation pumps are sealed and there is no way to take apart the motor, timer, or thermostat for repairs.

add a comment if you need more assistance.

Nov 05, 2010 | Grundfos Comfort Series Replacement Valve

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Where can I get the wiring diagram for the Laing Autocirc? I want to wire in a momentary switch so that when I am ready to get in the shower I hit the switch and the pump runs until the water is warm and...


If you have the same Autocirc product I have, then it cannot be taken apart. The timer seems to be connected and sealed together with the pump. If yours is different, answer back with the wires that you can see and we'll see if the timer can be by-passed.
http://waterheatertimer.org/Water-heater-recirculation-system.html

With the ordinary Grunfos-type pump that is not on a timer, you can add a switch and have the pump work on demand as you describe.

And they make a product that does the specific job you describe. It's called a Demand Pump. Link above shows two different types at page bottom.

I have not tested either Demand Pump shown. They operate on-demand ... when you activate the pump, the pump quickly brings water over from the hot water heater.

So the Demand Pump has a higher volume pump than the Autocirc or Grunfos.

I question a two things about the Demand Pump. 1) How will the increased pump pressure affect local pipes, especially supply tubes under a sink. 2) How HOT does the pump get? If pump gets hot, and it is located under bathroom sink next to paper goods, then that is a hazard. Some regional building codes don't allow ceiling light bulbs in closets because the bulbs get hot and start fires when people pack their closets full.

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Unit was installed in 2008 and never worked right. I was looking on the web and noticed it was installed on the cold water supply. i think it should have been on the hot side. The warranty on installation...


We had the same system but the comfort valve was staying open when the system wasn't scheduled to run. Getting cold water was near impossible so we called the support number and was told the valve is designed to stay open until hot water closes it. Why anyone would want to draw water from their hot water pipes when trying to get cold water makes no sense to me. We solved our problem by using a system that didn't allow water to enter the cold line accept when pump operates.

Feb 24, 2010 | Grundfos Comfort System Recirculator ...

1 Answer

Noisy Rheem 16 instant hot water heater


About the only device in that heater that could cause the noise you describe is an electrically operated valve that controls water flow. Rheem is a better-than-average company so I would give them a call and describe your problem to them; I'll bet that they will be glad to tell you which part you need and supply it to you.
We had a heat pump system from Rheem that needed only the replacement of one large relay and the outside unit fan motor during more than 25 years of service and is still operating at age 30 in our former home.

Oct 03, 2009 | Rheem 81VP6S/430126 Water Heater

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