mclain wgo-3 restarting issue

jsda77

Hello guys,

Days ago boiler stop due to no fuel situation. I filled oil and just set thermostat heat and run more than 30minute but I didn’t get any heat.

What should I do?

Does boiler keep pumpming oil withou ignition light?

SuperTech

You need to purge the air from the oil line. I would suggest replacement of the oil filter, pump strainer and burner nozzle since you ran out of oil those components are probably plugged. I advise you to call a pro, it shouldn't be very expensive. But if you cannot wait or afford to pay someone at least now you know what the problem is, it happens to everyone who has oil. Usually you can get the oil delivery driver to purge and restart the burner.

HVACNUT

If you post a pic of the burner, we could show you how to prime the fuel pump if that is in fact the problem.
Are you sure you were out of oil?
How many times did you hit the reset button?
Like @SuperTech said, even if you get it going with a "prime and start" it should be serviced by a pro annually and show you a print out of the combustion analysis.
The WGO -3 is a pretty tight boiler so keeping those flue passages clear is a must.

SuperTech

Just let us know if calling a pro is out of the question, we can help you out with getting it going, but I can't assure safe operation unless I'm actually there with my tools.

jsda77

Thank you so much guys.




This is my boiler pictures.

I just hit the reset button once and it ran for 20 to 30 seconds and stop and reset button popped up.

Oil out for just one day and I refueled it today.

SuperTech

On the the front of the burner, on the bottom left hand side you will see a small nipple that a 3/8" hex wrench will fit on. Reset the burner and crack open that bleed nipple by unscrewing it a couple of turns. With that open and the burner trying to start you should start to get spurts of air and oil out of the nipple. Be prepared to catch the oil in some sort of container like a pan or bottle. The burner will shut off and need to be reset, close the bleed nipple when this happens. Reset the burner and reopen the bleeder. Once you get a good steady flow of oil you should close the bleeder and the burner should fire up.

Be careful! Depending on how many times you have tried resetting the burner you likely could have flooded the combustion chamber with oil! 😧 This could lead to bad things if you ignite a flooded chamber. If you hit the button more than three times the excess oil should be cleaned out before you start it up. This is another reason why hiring a professional could really pay off, he becomes responsible for the safety issues.

jsda77

Dear SuperTech;

Thank you so much for your very detailed info.

I waited your reply but I tried "Prime" what you mentioned on the first comment with YouTube's help.

And it worked. I'm looking at it from time to time to check.

Now, I saw your awesome reply.
Thank you so much for your help and concerns.

Have a wonderful evening.

Thank you.

Sincerely,

HVACNUT

Unless of course it's a Webster or Danfos fuel pump, in which case you'll need to post a pic of the whole burner.

SuperTech

I'm glad I was able to help and it worked out!

SuperTech

> @HVACNUT said:
> Unless of course it's a Webster or Danfos fuel pump, in which case you'll need to post a pic of the whole burner.
>

I had a danfoss pump last week without anywhere to bleed air from. I didn't have to bleed anything at the time but I still don't understand how someone is supposed to bleed it, through the nozzle line?

STEVEusaPA

SuperTech said:

> @HVACNUT said:

> Unless of course it's a Webster or Danfos fuel pump, in which case you'll need to post a pic of the whole burner.

>



I had a danfoss pump last week without anywhere to bleed air from. I didn't have to bleed anything at the time but I still don't understand how someone is supposed to bleed it, through the nozzle line?

Do you have a picture/model number of that danfoss?

HVACNUT

The Danfos BFPH prime port is on the bottom of the pump. I think it takes a 7/16".
I know they have a model that doesn't need a bypass plug for 2 pipe but there has to be a way to bleed the air for single pipe.

SuperTech

I don't have a picture of that pump unfortunately. It could possibly be the one that @HVACNUT described. I've seen other ones with the bleed port on the top or the sides, but I didn't get a good look at the bottom of it.

STEVEusaPA

Ugh, reminds me of the first gen J pumps with no bleed port. Had to take out the plug. Little messy.
I guess crack the incoming line on a gravity job until you get oil (maybe add a tee with a small ball valve/cap.
Does seem odd, unless that particular pump is always supposed to be used with 2 pipe or a tiger loop.
Just for the aggravation alone I'd replace it.

HVACNUT

The Riello Mectron pumps didn't have a good prime port either. At least they sell the adapter.