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Noise from hot water circulating pump

I have a hot water pump circulator. It has started a fluttering sound ever since we bought a new water heater, Why?

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Could you have gotten air into the line and now the pump cavitates?

Posted on Sep 08, 2009

Testimonial: "Thanks a million. Makes alot of sense. How do we get the air out?"

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What would cause a circulator failure?


I am going to assume the circulator pump is on a hot water circulation loop. Turning the water back on could have stirred up the sediment that has collected in the bottom of the water heater. This could clog up and possibly ruin the impeller. Running for an extended period without circulating water can overheat and damage the pump also. It is a good idea to hook a hose to the water heater drain and flush out the sediment periodically. Hope this helps.

Jan 18, 2014 | Bell & Gossett 103252LF NBF-22 Circulator...

Tip

Heating Circulating Water Pump Problems


Changing your circulator pump is not always an easy process.
5243f0e.jpg
I will attempt to explain some of the possibilities for changing out a circulator pump. First of all I would recommend that if you are reading this and you do not have an extra circulating pump in the basement beside the boiler. That you stop by your local heating and air conditioning supply house and buy one. For under one hundred dollars it will be cheap insurance.


The very first thing you need to know is the water temperature in the boiler. If the water is hot, 140F or above than the problem is not the boiler. It is heating the water. The next thing will be to see if there is power coming to the circulator pump. Either take the electrical cover off of the circulator pump motor, or check for voltage at the source of the wire going to the circulator pump. If there is no voltage, usually 110 volts for the US, then you have to look at why the motor is not getting power. I will do another article on that issue at another time.

So now we have established that you have power coming to the motor. There is hot water in the boiler however the pipes going to the radiation are cold. The next thing to look for, are zone valves. They are little motorized valves that open and shut to direct the flow of heat to different parts of the house or building. It is possible that one of them could fail and the circulator pump is running and moving no water. Usually the circulator pump will be making a noise and often be very hot if this is the case. Of course then you need to check the zone valve. That, we will also cover later.

The first thing you need to do to change the circulator pump is to make sure that the electricity to the circulator pump motor is turned off. Verify that the power is off before touching the wires. The wires then need to be disconnected at the pump motor. Then the 4 bolts that hold the circulator pump in place need to be removed. Save these bolts, they may be needed to install the new pump. Carefully remove the pump from the flanges. A pry bar or screw driver may be needed to break the pump lose from the old flanges. Be careful of the motor, depending on the type of failure, the motor can be very hot.

If you had a responsible installer do your heating system, then you will have a valve in the piping on either side of the circulator pump. These valves will isolate the circulator pump from the rest of the heating system and changing the circulator pump will be fairly painless. If you do not have valves closed to the pump, then you will need to find the valves that will be the closest to either side of the pump and close them. For some older installs there may not be any valves and you will have to drain most of the water out of the system to change the pump.

This can get very complicated and professional help may be needed. The hardest part may be refilling the system and getting the air purged back out of the piping.

To install the new pump, clean the old gasket material from the flanges and install the new gaskets on the new pump. Carefully insert the new pump with gaskets into the flanges. Be careful not to damage the gaskets. Then install the 4bolts that hold the circulator pump in place. Tighten the bolts just so they are snug and not too tight. If they leak a bit you can always make them a bit tighter to stop the leak. Too tight may damage the gaskets. Hook up the wires to the pump motor again. Open the valves back up and check for leaks. Adjust bolts as needed. Apply power to the system and start the motor to check the operation of the circulator pump.

http://www.fixya.com/support/r3696173-expansion_water_tank_boiler_expansion

http://www.fixya.com/support/r3695967-valve_pressure_reducing_or_pressure


http://www.fixya.com/support/r3584200-boiler_leaking_water__the_boiler_leak_ma

on Dec 24, 2009 | Heating & Cooling

1 Answer

I have an old solid fuel fire with a back boiler behind it...the pump is making a buzzing noise....some radiators hot some not...please help


Tell us more: What is the Solid Fuel?-- Coal?-- Wood? Is this a Steam boiler?- or a Hot water boiler?-- It sounds like Hot water, for you mention a pump-- Perhaps it is a Hot Water Circulation pump?
Does the Boiler have a sight glass?-- What is the water level?
Tell us more, so we can help you figure things out.
Mack B.

Oct 13, 2013 | Bosch & Power Vent Water Heater

1 Answer

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.

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

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

My hot tub control panel keeps showing OH and the temp of the water is 99 degrees any sugestions?


It sounds like your circulation pump is not keeping up with the heater. Check for debris in the pump impeller. If this is 24 hour circulation pump, it is probably failing. New units are about $200 US

Aug 14, 2010 | Qca Spas Paradise Hot Tub

1 Answer

Two Rinnai's in series, large house, using circulater with electric pump connected to 2 gallon electric water heater. Problem is the Rinnai's seem to be firing almost constantly, apparently due to some...


Your circulator provides the draw necessary to fire the heater. You are defeating the purpose of this kind of heater by circulating the water. Add a second heater to fix this engineering fault.

Jan 05, 2010 | Rinnai Digital Remote Water Heater Control...

1 Answer

Engine runs hot, fan comes on & stays on.


Try to see if the water is circulating in the system. Better way to check without burning yourself is to take the thermostat out and run the engine this way it should start circulating right away. If the impeller on the water pump is not turning the water wont circulate.
I have seen this in a VW Jetta but don't know what type of w/pump is in your Honda.

May 12, 2009 | 1986 Honda Civic

2 Answers

Daughters 1996 ford contour 4 cyl. died on the road.After sitting a while it started again then drove it home.It starts and runs good but after warm up it bubbles out the expansion tank, I replaced the cap...


dear sir,

the solution to your problem is simple. yes you say that it has a new water pump, but the reason that a vehicle bubbles out of the expansion tank is because the water pump is not circulating coolant, the coolant boils in the engine and bubbles out of the expansion tank. secondly the reason the fan never kicks in is because the temp sensor is not seeing the heated coolant because the water pump is not circulating the coolant through the cooling system. 3rd. the heater never gets hot because the water pump is not circulating coolant through the heater core in order for it to get hot and provide heat. and the temperature gauge never seems to go up because yup you guessed it, the water pump isnt circulating coolant in order for the engine temperature sensor to see hot coolant and thus send a signal to the engine temperature gauge as to the coolant temperature. i know you said it has a new water pump, but i have heard that this type of vehicle may come with a plastic fin pump. i would remove the pump and check the passages for foreign matter{ trash} in the passages as well as the condition of the new pump. also one last thing, the reason the vehicle died on the road in the first place was probably because it overheated. happy hunting and please post to see what you found. i am a mechanic by proffession.

Dec 17, 2008 | 1996 Ford Contour

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