Question about Grundfos RCP-96 Recirculation Pump for Tankless Water Heaters

1 Answer

Waterfurnace fan starts then afyer-2 min condenser starts but only goes 2-3 minites and cuts off leaving fan running no heat on tube from grundfos pump

Posted by on

  • macneil144 Sep 27, 2010

    my 23 year old pump type 15-18 is not a 96 type but is on the side of a water source heat pump -takes water from oround the motor and moves it to hot water tank and back again but does not seem to be starting up - how can it be tested please

  • macneil144 Oct 26, 2010

    It was no power due to bad contacts at the relay -cleaned

×

Ad

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • Grundfos Master
  • 43,501 Answers

Hi,
Does the pump keep on running or does the compressor shut down and the pump stays running???
Sounds like you may not have flow through the ground loop and it is shutting the compressor down...

heatman101

Posted on Sep 16, 2010

  • D. Floyd Kolb
    D. Floyd Kolb Sep 27, 2010

    Hi,

    Testing the pump can be confusing...

    often an amp metter will tell you if the motor is running, but I have had the impleers srip off the shaft or even break so even though the motor is running that does not mean that the impeller is...

    Often times the motor will sieze up and not spin at all but the motor shoes it drawing current...so that can also happen...

    best way to check what is going on is to check temperatuer deferential when there should be one and also check the amp draw of the motor at the same time.

    You get current draw and no temp. differential then pump is bad...



    heatman101

×

Ad

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of.(from cars to computers, handyman, and even drones)
click here to download the app (for users in the US for now) and get all the help you need.
Goodluck!

Posted on Jan 02, 2017

Ad

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Cointra godesia water heater... works perfectly but only for 5 mins then pilot goes out... u can relight straight away and it works for 5 mins again .. this boiler I have just bought new ... j


In my experience thermocouple either work or they do not.when a water heater runs for a length of time before the interupter cuts the pilot or on some modules safety cut out sensor also known as over heat thermostat cuts the gas supply the problem can normally be found in the flue restricting the disposal of waste products of the combustion or the lach of air flow through the appliance

May 19, 2013 | Water Heaters

3 Answers

My ecosense 180dvn sends out an error code of 13 after 2min 30 seconds. It is always after 2:30 min. I can shut it off after 2 min and back on and it continues to run. But the water has to be shut off...


I have the exact same problem with error code 13 on my Rheem/Ecosense 180dvn . The unit ran good for at least a year, and then I started getting the same error 13 every few minutes. I called the Rheem service department, and they told me to check the vent installation as well as the gas pressure. I reinstalled the vent with new seals. I only have about 6 ft of vent, so there should be very little resistance. I checked the gas pressure, and it shows 9 in H20 pressure, which is well in the range recommended. The service center scoffed at the suggestion that it could be their circuit board. I am totally at a losss and at the verge of ripping this very expensive installation out of my attic.

Jan 30, 2011 | Rheem EcoSense by 7.4 GPM Tankless Water...

1 Answer

I have a 50 gallon Richmond Power vent water heater. The burner would try to light but would not. I replaced the vacuum switch, but this did not solve the issue. The tygon tube that runs from the vacuum...


The accumulation of condensation in the vent piping is more than likly the problem. I am guessing the vent piping is either 3-inch or 2-inch. You need to splice in a "T" fitting reduced down to 3/4-inch with a 3/4-inch tubing attached and run this to a sutible drain. This will drain the condensation elimiating the accumulation in the vent assembly. Install this "T" fitting about 3-feet down stream from the vent motor.These supples and fittings can be found at a Home Depot or Lowes store.

Jan 27, 2011 | Audiovox Richmond 6G40-36F 6-Year Tall Gas...

1 Answer

Thermostat keeps cutting power off to elba excellance oven


I have a similar problem with an Indesit oven. There are two thermostats one controlling the oven temperature which i think you have replaced and another over-temperature stat to prevent the oven getting to hot should the temp stat fail to control the temperature. The over- temperature stat could be operating to quickly and this cuts power to the the digital display, oven light, temp light and circulating fan. I am going to replace this over-temp stat

Jan 18, 2010 | Lux Elba OV 5085 LUX

1 Answer

We have a robbens underfloor heating system with a heatrae electric boiler on a floating floor system. The underflooe heating manifold has a grundfos Alpha + pump. What setting should this be at? Currently...


Venting of the system is when you re circulate the water or cooling fluid in higher speed to eliminate the air bubbles from the system.
If water circulate on a too higher rate does not have time to dissipate the heat so your floor is cold.
You need to go to 2 or even 1 depending on the length of the heating coil in the floor. Unfortunately the pump only has 2 speeds (setting 1 and setting 2) so whoever install your system had to calculate the length of the pipe for maximum efficiency. Try on 2 and if not satisfactory go to setting 1. If too hot on setting 1 then you can adjust the heat by reducing the amount of water from the shut-off volume control. It is a hit and miss situation, I know but unfortunately that is the only choice remaining now after the system is installed.

Jan 10, 2010 | Grundfos RCP-96 Recirculation Pump for...

1 Answer

Arcoaire heating/air conditioner continually cycles condensation


a possible solution is to install an air dryer in line with this tube

Jan 03, 2010 | Calvin Klein The Field Controls Company...

1 Answer

Hot water is cutting out after 2 - 3 minutes whilst showering


check the screen on the cold water intake on the cold side,, you might have to flush the system out, and do you have the shower head water restricter in, if not you may be using to much hot water,,, how many other hot water fixtures are running at the same time? try running just the shower,,,if this is a tank water heater the dip tube could be bad that is on the cold side it takes the cold water to the bottom of the tank and forces the hot water out,, if you ar only getting a couple of min of hot water and the dip tube is bad it is not going to the bottom but just at the top and not getting all the hot water you will need a plumber

Mar 21, 2009 | Water Heaters

Not finding what you are looking for?
Grundfos RCP-96 Recirculation Pump for Tankless Water Heaters Logo

Related Topics:

51 people viewed this question

Ask a Question

Usually answered in minutes!

Top Grundfos Water Heaters Experts

Donni Steen

Level 3 Expert

659 Answers

Brad Brown

Level 3 Expert

16037 Answers

Gil Shultz

Level 3 Expert

3368 Answers

Are you a Grundfos Water Heater Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...