Boiler problems

[Stroppymonkey]

The pump is working. Its pulling fuel up, but with a load of air. Think these boilers have a built-in none return valve.

What boiler do you have? If you are getting air in on a suction system you have a bad joint somewhere.

 

[diggerjones]

What boiler do you have? Clear tube makes it sound like it might be an HRM or a Grandee wall hung affair?

Hrm wall star

 

[V8Druid]

The pump is working. Its pulling fuel up, but with a load of air. Think these boilers have a built-in none return valve.

if you have air in the line feeding the pump it will cavitate and never clear the air bubble in the line ... try my previous suggestion of manually filling it via port

 

[diggerjones]

I've had a pipe p

if you have air in the line feeding the pump it will cavitate and never clear the air bubble in the line ... try my previous suggestion of manually filling it via port

I understand now.

 

[Stroppymonkey]

if you have airir in the line feeding the pump it will cavitate and never clear the air bubble in the line ... try my previous suggestion of manually filling it via port

Nah. If its on single supply it will need bleeding through the pressure port with a manifold or dragging through with suction pump. If dragging air will be easy to see as HRM use a clear flexible on the supply. If thats pulling air then the line is compromised by either blocked filters/failed fire valve and or leaking joints.

PS. Rather s**t in my hands and clap than work on an HRM wall hung boiler! (sorry @diggerjones !)

 

[pettsy]

PS. Rather s**t in my hands and clap than work on an HRM wall hung boiler! (sorry @diggerjones !)

Once had the joy of working on a wall hung grandee boiler as an apprentice

 

[Stroppymonkey]

Once had the joy of working on a wall hung grandee boiler as an apprentice

I fitted one for a family member back around 2004. I still have trauma. We refuse to work on Grandee, and fortunately not many HRM in our area.

 

[diggerjones]

I've had a pipe p

I understand now.

Just took flexi feed pipe off and filled with oil. Put it back on and no difference

 

[bobthebuilder]

Just took flexi feed pipe off and filled with oil. Put it back on and no difference

have you a length of clear plastic pie you can put on the end of feed pipe ,and suck it thru ,sounds like an airlock in the oil feed pipe ,?

 

[diggerjones]

Nah. If its on single supply it will need bleeding through the pressure port with a manifold or dragging through with suction pump. If dragging air will be easy to see as HRM use a clear flexible on the supply. If thats pulling air then the line is compromised by either blocked filters/failed fire valve and or leaking joints.

PS. Rather s**t in my hands and clap than work on an HRM wall hung boiler! (sorry @diggerjones !)

It's been a good boiler to be fair. With the burner bit outside it's handy in this scenario.
Would it be possible that because the tank is half full and I've had the feed pipe off I've caused a air lock that I will never remove unless I fill tank or use a suction pump

 

[V8Druid]

Nah. If its on single supply it will need bleeding through the pressure port with a manifold or dragging through with suction pump. If dragging air will be easy to see as HRM use a clear flexible on the supply. If thats pulling air then the line is compromised by either blocked filters/failed fire valve and or leaking joints.

PS. Rather s**t in my hands and clap than work on an HRM wall hung boiler! (sorry @diggerjones !)

makes sense .... although surely the NRV should stop any run back long enough to fill that line from bleed port? .. seems to me that it's basically air locked and with the pump above the air bubble in the clear line it has no chance of sucking fuel up to clear the air .. kero pumps won't pump/suck air / create a vacuum

 

[bobthebuilder]

i have one of these type of things as i have a customer who runs out of oil and airlocks the feed pipe

 

[bobthebuilder]

It's been a good boiler to be fair. With the burner bit outside it's handy in this scenario.
Would it be possible that because the tank is half full and I've had the feed pipe off I've caused a air lock that I will never remove unless I fill tank or use a suction pump

airline and blow it back thru to tank ?

 

[V8Druid]

have you a length of clear plastic pie you can put on the end of feed pipe ,and suck it thru ,sounds like an airlock in the oil feed pipe ,?

or alternatively fit into the bleed port and suck like hell

 

[Stroppymonkey]

airline and blow it back thru to tank ?

There should be a non return valve on line. Blowing back to tank shouldn’t be an option unless NRV failed or not installed.

 

[V8Druid]

airline and blow it back thru to tank ?

or seal the breather in the tank and pressurise the tank a little to push it up the line

 

[diggerjones]

I've got a car brake bleeding suction pump, that might do it

 

[Stroppymonkey]

makes sense .... although surely the NRV should stop any run back long enough to fill that line from bleed port? .. seems to me that it's basically air locked and with the pump above the air bubble in the clear line it has no chance of sucking fuel up to clear the air .. kero pumps won't pump/suck air / create a vacuum

Indeed , although @diggerjones said it’s sucking air I think ? He could only know this if it’s visible on clear flexible hose prior to oil pump.

Suggest it’s time for a specialist? Depends how the other occupants of property feel about lack of heating / hot water!

 

[V8Druid]

It's been a good boiler to be fair. With the burner bit outside it's handy in this scenario.
Would it be possible that because the tank is half full and I've had the feed pipe off I've caused a air lock that I will never remove unless I fill tank or use a suction pump

really depends on the head - differential between the top of the level in the tank and the height at which the pump is sat -- might just be possible if they're close to the same level I 'spose

 

[diggerjones]

Indeed , although @diggerjones said it’s sucking air I think ? He could only know this if it’s visible on clear flexible hose prior to oil pump.

Suggest it’s time for a specialist.

I can see the air. But could it be a pocket of air that the pump can't suck up.
YOU LOT ARE THE EXPERTS