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I am trying to bleed the furnace and nothing is coming out of the hose, why?

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  • HVAC Techman May 11, 2010

    A furnace is warm air, a boiler is hot water. What do you have?



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On the oil pump (left hand side of burner) there will ba a small bleeder screw with a 3/8" hex nut attached to it. Get a 2' length of clear hose and make sure itr fits tight in the bleeder. Put the other end in a coffee can or something. Have a helper turn up the thermostat to start the burner motor. At the same time unscrew the bleeder and watch for oil to flow out of the screw. The oil should not have any air bubbles in it. The safety control will time-out between 15 and 45 seconds and shut off the burner. When this happens, tighten the bleeder. You will have to reset the safety control by waiting a minute and depressing the red button. You may need to perform it again to get all the air out. If you are not getting any oil, you may have a plugged oil line, plugged oil filter, a kink in the oil line, a leak at a fitting upstream of the oil pump allowing the pump to **** air or a bad oil pump. There is also a small screen inside the oil pump accessible by removing the 6 Allen head screws on the end of the pump. You will need a pie pan to catch the oil and some thin gasket material to replace the oil seal between the end cap and oil pump. At this point you are on your way to being a top notch oil burner technician!

Posted on Dec 13, 2009


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1 Answer

I need help please I can't bleed my brakes on my 2005 blazer I've tried everything. I changed the hoses going to calipers I've changed the master cylinder I've bleed the whole system with the key on and...

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Try to bleed the brakes and no fluid comes out.

Try removing the bleeder screw all the way. If fluid now comes out, use paperclip to clear bleeder screw. If still nothing, loosen brake hose at end nearest to MC to see if you get fluid there. If yes, replace brake hose. Still nothing? crimped line between MC and hose, or bad MC or misadjusted linkage from pedal. Pedal must release all the way and have some free play 91/8th inch or so).

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I have 3 zones on my boiler and I am trying to bleed the one thats not giving heat, no water comes out when you bleed it whats wrong 1 will not bleed


Feb 21, 2015 | Heating & Cooling

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How to bleed water furnace

Maintaining water pressure and keeping the circulator pump running, go to the furthest bleeder and remove any air at each bleed port working your way back to the furnace. You must maintain water pressure or you will have to start all over again.

Jan 10, 2015 | Heating & Cooling

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Peerless Boiler - Turned off boiler to replace Circulator for the hot water. Turned furnace back on. Did not ignite. Tried to hit the reset button for 30 seconds and nothing happened. Furnace will

Did you bleed the air out of the pump. The boiler has a flow switch that has to make before it will let the boiler lite. Make sure you have all of the air out of the system and are pumping or flowing water and not air...Also check to see if you didn't happen to of tripped the limit it has a manual reset. Red Button on the front of limit.

Nov 13, 2013 | Heating & Cooling

2 Answers

Reillo 40 oil burner wont start

If I read correctly, you should have a pump for your fuel oil. If you are not getting anything out of the bleed screw I would suggest you start there, see if it is running, then check for clogged fuel lines, or possibly filter. Do you have a pilot light or HSI? Does that come on?

Mar 02, 2013 | Heating & Cooling

1 Answer

Furnace starts flame come on 3sec then goes out it doe,s this 10 times then starts and runs but air feels cold coming out warm not hot like before

Sounds like you could have 1 of 2 problems:

1. The flame sensor is dirty. The flame sensor is a small rod just a little bigger around than a pencil lead. It is located in the burner section just a few inches left or right from your glow ignitor. The flame will surround this sensor, but it the sensor is dirty, it cannot sense the heat of the flame. Take the sensor out of the furnace. It generally has one screw holding it, and one wire connected to it. Use emory cloth or light sand paper, or even a small wire brush to clean the sensor. DON'T GET IT WET.

2. You may have air in the gas line. This happens especially if the gas has been turned off to the house. You can bleed the gas line by loosening the gas line connected to the furnace. (furnace turned off) Bleed it just for 10 seconds or so, tighten the gas line, check for leaks with soapy water, and try the furnace again. You may have to do this more than once.

May 21, 2011 | Heating & Cooling

1 Answer

Furnace ran out of oil,got oil for the furnace,started furnace ran for 10 secends then switched off

On the oil pump there should be a bleed screw. Attach a tube to it and the other end to a can and 3/8" wrench, restart burner by depressing red button on Honeywell control and open up bleed screw. Oil will start flowing into can. When full stream of oil coming out of hose, tighten bleed screw. You have less than a minute to do this or the Honeywell control will shut off burner for a minute. It may take more than one try.

Jan 18, 2011 | Heating & Cooling

1 Answer

I have a miller furnace in my shop, runs on K1, recently I ran it out of K1,after putting 100 gallons in the tank, I cannot bleed the system, furnace will start, nothing comes out of the bleeder valve.HELP

Check the filter on the tank to make sure it is not clogged. Then iff it still will not bleed take the screw out od the top of the pump usually a 1/2 inch or 9/16 and fill the pump with kerosene and then put the screw pack inand try to bleed. sometimes priming the pump will get the pump running again because it air locks the when it is run out of fuel.

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Changed clutch master cyl. and clutch still goes to floor

try to gravity bleed the system..............leave the master cap off and open the bleeder screw....sometimes this can take a while.epically if you don't bench bleed the new master.(some clutch masters Ive seen (ford especially) take a lot of pumping literally hundreds of pumps)
hope this helps.Good luck!

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