Question about Grundfos Comfort Series Replacement Valve

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The replacement, replacement, replacement, valve is stuck open again.

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Can your hot water be set too high

Posted on Oct 12, 2009

  • MrSalami Sep 30, 2010

    This seems to be a common problem with these valves. After being scalded for a second time I took mine out..

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Alpha cd28c boiler loosing water and pressure through pr valve when heating is on,and when then switched off needs repressuring to use heating again.no obvious leaks.new pr valve been fitted.pressure


I assume losing pressure through the PR means Pressure Relief Valve (PRV) or temperature pressure (TPR). Open in TPR may mean boiler is overheating/overpressurized. Open in PRV means the Pressure Reducer/Fill Valve in the fill line of the boiler is broken.
House Water Pressure in a home is 30/40 PSI min to 60-80+PSI max.
Boiler PRV/TPR are set at 30 PSI open (SYSTEM PRESSURE) so too high a house water pressure will open the PRV/TPR. Replace the reduction regulator on/in the fill valve assembly

Oct 20, 2014 | Water Heaters

1 Answer

How to clear Major plumbing clogs


I am assuming that you are referring to a calcium or rust build up in the water heater.
If you are having this issue you will need to turn off the water to the heater. You will need a garden hose, access to a outside water soucre, cold water is fine.
Shut off the gas or power to the hot water heater before starting.
Now you will need to place the garden house on the drain fitting on the water heater, placing the end of the hose outside and lower than the drain valve. Open the valve and drain the heater, you will need to open a hot water faucet to help drain the heater. I don't suggest opening the TPR ( Temp Pressures relief )valve due to the fact that they sometimes leak or don't reseal after opening them.
Hopefully the drain valve is not clogged, you should hear and see water exiting the garden hose.
If you are not getting any water from the drain valve you are going to have a challenging task.
If no water is coming out, my recommendation is to get the required tools to remove the hot water line from the top or side or the heater, also a few towels to soak up water A bucket is helpfull also.
remove the hot water line, then you will have to use a small hose to siphon the water from the tank. Once the tank is empty you can then remove the drain valve and replace it.
once you have replaced the drain valve you should ensure that it's closed and use a Gallon of CLR. Poor this into the water heater through the hot water outlet where you removed the pipe from. Now make sure the faucets are closed and replace the hot water line. You can now turn the water back on to the water heater.
After a few minutes open a hot water faucet to let out any air until water flows out, than close the faucet.
Let the water heater set for a few hours, then drain the tank!
when the tank drains, close the drain valve again and refill the water heater. Once again open a a hot water faucet and let the air out till the water heater fills. Again let sit for a hour.
At this point open a hot water faucet at the farthest point from the heater and let the water run for 5 min. , than close it and move to the next closest faucet and repeat until all faucets have been opened and run for 5 minutes.
If you still have a slow flow in a faucet, you may need to repeat the CLR step.
I also suggest that you remove all faucet screens and clean them.
If you still have a clog than you are going to have to remove or replace a piece of water line in the house. The blockage may be hard to find but if you have access to most of the pipe or it's visable you may be able to hear the blockage with the water on. Otherwise this will result in using some water line taps and a pressure guage to find the blockage.

Oct 17, 2013 | Mountain Plumbing Water Heaters

1 Answer

Temparature and pressure relief valve seem to be leaking continuously


1) Lift TP lever and lower back down to dislodge anything stuck in valve
2) Replace TP valve with generic one from hardware store

Steps for replacing valve are shown on link below
http://waterheatertimer.org/How-to-replace-TP-valve.html

Jan 11, 2011 | General Electric GE SmartWater Household...

1 Answer

Is there a problem with the Grundfos Comfort Series Undersink Valve that causes it to lock in the open position?. One of my valves has done this causing the cold water faucett to run very hot. ...


This is a common problem with this valve. Try placing the valve in near boiling water then set to cool before trying again. It worked for me until the next time it failed and I got a different system.

Jun 13, 2010 | Grundfos Comfort Series Replacement Valve

1 Answer

Water level to low on boiler


There is a automatic valve that is suppose to open when water gets low in the system. They do rust up and quit working. You can add water to the system. There should be a waterline making a loop around the automatic valve. It will have a manual valve open this up to allow the water through and close it again when the correct water pressure/level is acheived. Should replace the automatic valve as soon as possible. I hope this has helped, please rate if it has helped in any way. Good Luck and have a great weekend.

Apr 02, 2010 | Water Heaters

2 Answers

Rheem water heater Model 81v40DT Water heater is making a "shhhh" hissing sound. It began on Friday and has continued continually. I have checked all of the water valves in my house and have not noticed...


I can't find details of this model, but I am assuming it is an electric heater.

Turn off the elecricity supply to the heater. If the sound you describe subsides almost immediately then the problem is a faulty thermostat. The sound is caused by the water overheating (the heating element is permanently on).

(If the sound does not subside quickly then you have a different problem.)

Check the wiring to the thermostat. If that is OK you will need to replace the thermostat.

Mar 09, 2010 | Rheem 40 GAL ELEC TALL Water Heater 6YR SC...

2 Answers

Suburbun rv waterheater 10 gallon with electric ignitor makes clicking noise because it'strying to ignite but it's like no fuel is getting to it to start.


I had a similar problem, I could hear the valve clicking and spark working, but no flame. I checked for voltage as per the previous post, and checked continuity of both coils. Both showed voltage and continuity, but the ohm reading on one coil was less than the other.

I called a rv repair shop looking to buy a new valve ($120 - ouch). He didn't have one and when I explained what I had checked, he said could be that only one valve is opening. He suggested I remove one wire from each coil, turn the heater switch on and when I hear the spark igniter, touch a wire to one of the coils at a time. If it clicks, then it's fine, if it doesn't, then it could be the coil that needs replacing or the valve is stuck. If you see a spark as you touch the wire but no clicking, then it's a stuck valve. If there's no spark, then it's most likely a defective coil. A stuck valve can sometimes be freed by tapping with a screw driver.

In my case, one valve clicked, the other didn't and no spark was seen so I had a defective coil.

The previous poster is right, replacement coils are not offered as a replacement part - but - the repair shop I talked to saves all the coils out of old heaters and I was able to buy one from him for $10.

Problem solved, heater now works!!

Jun 27, 2009 | RTO Suburban Rv Water Heater Dsi Gas Valve...

1 Answer

A trickle of hot water from taps, central heating ok


it sounds like your shut off valve might be bad even though it turns on and off by turing it doesn't mean that the washer is not stuck to the seat and not opening, try replacing the valve

May 18, 2009 | Water Heaters

1 Answer

Dripping from drain spout


If you are refering to the "Dripping coming from the preasure tempature valve,Then just turn off the valve where the water goes into the heater and open the P/T valve with a bucket below it draining only emought water to get below the level where it reaches.     Normally the drain valves are plastic with a Male hosebib attached.  Attach a  garden hose to the rain and run it out to a point lower that the vaslve in order for gravity to drain the tank.The valve opens counter clock wise. If the valve is stuck or does not drain,and you have a foor drain handy,remove the whole valve and replace it with a boiler drain valve.  If The tank is located below the drain level then you will have to either pump or carry the drain water to the higher level.     Replace the P/T valve  and reinstall the associated associated piping. I would use tefelon tape on the P/T pipe theads.    You may have to open a hot water faucet in order for the air to replace the water in the tank ,in order to drain. 

Jan 31, 2009 | Rheem 40 Gallon FVR NATGAS Low WATER...

1 Answer

Hot water coming out of overflow pipe on my vulcan everhot water


Assuming you are talking about the temperatur/pressure relief valve, it is stuck open.

1. Turn off gas or electric to water heater
2. Close water supply to water heater
3. open hot water faucet on nearest fixture to depressurize hot water system.
4. close tpr valve (you may have to push in on the center spine. It may be resistant to closing from sediment. If so, opening and closing several times may solve that issue.

Once you get the tpr valve closed, close the faucet and open the supply valve. If the tpr stays closed, go ahead and turn on the gas/electric and re-light pilot and turn on control etc.

If the TPR blows again, you will need to replace it. YOu can buy a new one at any plumbing supply store. Shut down the heater again, drain a bit of water out using the valve on the bottom of the tank. there is probably copper pipe connected to the TPR valve which you may have to cut or maybe can just unscrew. The TPR threads out of the tank, install the new valve (make sure to use pipe dope or teflon tape.

Jan 04, 2009 | Water Heaters

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