How do I know if the circulating pump is bad on my boiler? It is a Grundfos UP-26-64F
Already Tried: The pilot lights, The flame sensor senses the flame and turns on the burner. It starts to heat up and then you hear the water making popping sounds and then jerking sounds form the water inside the place where it gets heated up. Also what book would you recommend on how to diagnose and fix my boiler?
Sorry you're having trouble...
Yes, it does! They call that a drain plug, right?
Ok...well..it's not really a drain plug...
It is a HYTECH brand Boiler
The end of the pump shaft is slotted. Sometimes these motors stick..especially after sitting all summer. Try turning it with a screwdriver and see it the rotor is stuck..
It was running for a 2 days without any problem and then all of a sudden this happened.
IF there is air in the pipes it can be a real killer of the Grundfos pump. The rotor and bearings are water lubricated...They don't like air. It can chew up the bearing surface pretty fast sometimes..
The pump is not making any noise at all.
You need to make sure there is power to it.. Next pull the electrical cover off (with power off) and see if it has fried a wire terminal or a capacitor.
I could never tell if this pump was on even when it was working lol
That's a good feature..nice and quiet....
I found a replacement online for $236
Try turning it on with the plug out of the end and see if the shaft spins.
I am going to check that now.
You'll want to check and make sure the relay that energizes the pump is good. On the box there on the wall....do you hear it click if you turn the power off and on?
It definitely clicks on. You can feel it and hear it Model 8494-101
Do you own a volt meter?
yes I do
Take the plastic cover off the electrical box on the pump and see if you're getting 120 volts to it...
Yes, it does have power going to it 122.8 volts
You can pretty much assume a faulty winding in the pump motor. Looks like it's time for a new one. Sorry..
One of the pipes also has al small leak :( That must be what caused it to break.
Truly..probably a coincidence...
Its one of the pipes with a flange fitting like a brake line on a car. To of them come together on the bottom inside of the boiler into a big valve.
A small leak shouldn't hurt it unless there was so much air in the system you were not getting any flow.
Sorry...do you think you'll be able to fix the leak??
Yes I will. It will be easy to fix. Is there any trick to changing the pump I should know?
Well....not really...you have a valve on the top..but it doesn't look like the bottom flange had one is that correct?
The pipe that is leaking is under the boiler cover. I should not have used the word valve. It is a big coupler with 5 different connections right in the center of the boiler.
Going back to the pump...
Shut off the makeup water...and drain enough water so that the pressure is at 0. Shut that flange valve off over the pump...Take your new pump apart...(4 allen head screws)...pull just the motor assembly out.....remove the 4 screws holding the old motor on the pump housing....remove the old one and quickly stick the new one in....make sure the rubber oring stays in place...
Not as hard as it sounds and saves alot of time and loss of water. Yes you'll get some water loss...but if you're quick you don't lose much..IF you are uncomfortable with this...Don't Try it!!
What does the isolation valve do?
OK...looks like you may be draining the whole system to fix that anyway!!
How do you get it to turn? it moves slightly left right and pushes in?
No...big screwdriver....turn hard...
There is not one under the pump.
I have drained it before. I know it is a pain to get it to circulate properly again :(
Is there another hose bib anywhere besides the one by the floor?
No just that one. I replaced it about 3 years ago same with the presure relief valve.
Ok...sorry...about having to drain it.
You have been a great help! :) I will be using your service in the future! Thanks for your help!
Check ebay for your pump...I think you can save some$$$
Good idea! Thanks
You're welcome...anything else I can do for you?
Not today. I will most likely be contacting you when I try to install the pump. :)