Home |
Search |
Today's Posts |
|
UK diy (uk.d-i-y) For the discussion of all topics related to diy (do-it-yourself) in the UK. All levels of experience and proficency are welcome to join in to ask questions or offer solutions. |
Reply |
|
LinkBack | Thread Tools | Display Modes |
#1
|
|||
|
|||
Extractor fan not extracting
Hi,
I have a hood type extractor fan over my hob. Lately this has given up on its extracting duties. When I turn it on theres the usual whizzing noises but no air is being sucked up into the hood. I took the cover off the hood and removed the filter (pretty clean). There's a big fan that spins round at an impressive rate but I can't feel any updraught of air into it. I climbed on to the kitchen roof and checked that the vents are clear and you can feel a slight draught coming from the vent. Any clues? -- Flash Gorman. http://www.flashgorman.com |
#2
|
|||
|
|||
Extractor fan not extracting
do a smoke type test to estabilish what draw is on the vent
|
#3
|
|||
|
|||
Extractor fan not extracting
"Alex" wrote in message ... do a smoke type test to estabilish what draw is on the vent ok, any pointers as to how I would do this? I have tried boiling a kettle under the hood and the steam can be seen going anywhere but into the hood. |
#4
|
|||
|
|||
Extractor fan not extracting
flashgorman wrote:
Hi, I have a hood type extractor fan over my hob. Lately this has given up on its extracting duties. When I turn it on theres the usual whizzing noises but no air is being sucked up into the hood. I took the cover off the hood and removed the filter (pretty clean). There's a big fan that spins round at an impressive rate but I can't feel any updraught of air into it. I climbed on to the kitchen roof and checked that the vents are clear and you can feel a slight draught coming from the vent. Any clues? Are you sure it really used to work? If it really has got worse there's not much that can go wrong, check that the fan is spinning at the right speed, clean the filter thoroughly and then the only remaining possibility that I can think of is a nest or some such in the duct. -- Chris Green |
#5
|
|||
|
|||
Extractor fan not extracting
wrote in message ... flashgorman wrote: Hi, I have a hood type extractor fan over my hob. Lately this has given up on its extracting duties. When I turn it on theres the usual whizzing noises but no air is being sucked up into the hood. I took the cover off the hood and removed the filter (pretty clean). There's a big fan that spins round at an impressive rate but I can't feel any updraught of air into it. I climbed on to the kitchen roof and checked that the vents are clear and you can feel a slight draught coming from the vent. Any clues? Are you sure it really used to work? Indeed. It makes a lot of noise and the sucking-up-ness used to be impressive to behold. If it really has got worse there's not much that can go wrong, check that the fan is spinning at the right speed, clean the filter thoroughly Tried it without the filter at all and still no joy and then the only remaining possibility that I can think of is a nest or some such in the duct. Have removed top of the ducts (appear to be two) on the roof and can't see anything. If I disconnected the pipe from the top of the fan should I then be able to feel the fan sucking up (and hence prove the pipe is blocked) or will it suck without the pipe? Chris Green |
#6
|
|||
|
|||
Extractor fan not extracting
A long shot - but may help...
I had a similar problem with a brand new extractor that did not seem to do anything either. When I finally opened the cover a few weeks later I discovered that there is a leaver inside that should be set depending on whether you extract to the outside, or to the inside (filtering only). Needless to say, mine was set to external extraction mode, which was blocked with a cover, as I only wanted it to filter. The smell from the fan was interesting too... Pretty embarrassing I must say, although it wasn't me who fitted it. May be worth checking whether you have such settings, and whether it moved. Just my 2p-worth. J. "flashgorman" wrote in message ... Hi, I have a hood type extractor fan over my hob. Lately this has given up on its extracting duties. When I turn it on theres the usual whizzing noises but no air is being sucked up into the hood. I took the cover off the hood and removed the filter (pretty clean). There's a big fan that spins round at an impressive rate but I can't feel any updraught of air into it. I climbed on to the kitchen roof and checked that the vents are clear and you can feel a slight draught coming from the vent. Any clues? -- Flash Gorman. http://www.flashgorman.com |
#7
|
|||
|
|||
Extractor fan not extracting
"JoeJoe" wrote in message ... A long shot - but may help... I had a similar problem with a brand new extractor that did not seem to do anything either. When I finally opened the cover a few weeks later I discovered that there is a leaver inside that should be set depending on whether you extract to the outside, or to the inside (filtering only). Needless to say, mine was set to external extraction mode, which was blocked with a cover, as I only wanted it to filter. The smell from the fan was interesting too... Pretty embarrassing I must say, although it wasn't me who fitted it. May be worth checking whether you have such settings, and whether it moved. Just my 2p-worth. Cheers ,sorry should have mentioned that I have found said lever and its set to external. |
#8
|
|||
|
|||
Extractor fan not extracting
"flashgorman" wrote in message ...
"JoeJoe" wrote in message ... A long shot - but may help... I had a similar problem with a brand new extractor that did not seem to do anything either. When I finally opened the cover a few weeks later I discovered that there is a leaver inside that should be set depending on whether you extract to the outside, or to the inside (filtering only). Needless to say, mine was set to external extraction mode, which was blocked with a cover, as I only wanted it to filter. The smell from the fan was interesting too... Pretty embarrassing I must say, although it wasn't me who fitted it. May be worth checking whether you have such settings, and whether it moved. Just my 2p-worth. Cheers ,sorry should have mentioned that I have found said lever and its set to external. My new hood had both a paper filter and a charcoal one. The charcoal one is removed for external venting since you don't need to get rid of smells. Maybe yours wasn't and is now blocked up. What I'm saying is check if there is another filter. MBQ |
#9
|
|||
|
|||
Extractor fan not extracting
flashgorman wrote:
"Richard Sterry" wrote in message ... flashgorman wrote: Hi, I have a hood type extractor fan over my hob. Lately this has given up on its extracting duties. When I turn it on theres the usual whizzing noises but no air is being sucked up into the hood. I took the cover off the hood and removed the filter (pretty clean). There's a big fan that spins round at an impressive rate but I can't feel any updraught of air into it. I climbed on to the kitchen roof and checked that the vents are clear and you can feel a slight draught coming from the vent. Any clues? Is there a build-up of fat/grease somewhere in the ducting? Not as far as I can insert an arm, James Herriot, style, at either end. ....then it would appear to be defying the laws of physics! If the ducts are clear, the outlet grill is clear, the recirculate/extract lever is in the right position, and the fan is going round at a decent speed, then it MUST draw air through. If air is not being drawn through, then one of the previous assumptions/observations must be wrong. Unless it's the unknown factor 'X' of course. ;-) Rick |
#10
|
|||
|
|||
Extractor fan not extracting
Richard Sterry wrote:
...then it would appear to be defying the laws of physics! If the ducts are clear, the outlet grill is clear, the recirculate/extract lever is in the right position, and the fan is going round at a decent speed, then it MUST draw air through. If air is not being drawn through, then one of the previous assumptions/observations must be wrong. Unless it's the unknown factor 'X' of course. ;-) Like a burnt out or shorted motor winding? It would still spin but with far less force.... -- Cheers, John. /================================================== ===============\ | Internode Ltd - http://www.internode.co.uk | |-----------------------------------------------------------------| | John Rumm - john(at)internode(dot)co(dot)uk | \================================================= ================/ |
#11
|
|||
|
|||
Extractor fan not extracting
John Rumm wrote:
Richard Sterry wrote: ...then it would appear to be defying the laws of physics! If the ducts are clear, the outlet grill is clear, the recirculate/extract lever is in the right position, and the fan is going round at a decent speed, then it MUST draw air through. If air is not being drawn through, then one of the previous assumptions/observations must be wrong. Unless it's the unknown factor 'X' of course. ;-) Like a burnt out or shorted motor winding? It would still spin but with far less force.... Well, the original poster said it "spins round at an impressive rate", but I guess that's purely subjective - depends on how easily impressed he is! ;-) Rick |
#12
|
|||
|
|||
Extractor fan not extracting
In message , flashgorman
writes "Alex" wrote in message ... do a smoke type test to estabilish what draw is on the vent ok, any pointers as to how I would do this? I have tried boiling a kettle under the hood and the steam can be seen going anywhere but into the hood. Smoke matches from a CH merchant -- geoff |
#13
|
|||
|
|||
Extractor fan not extracting
"raden" wrote in message news In message , flashgorman writes "Alex" wrote in message ... do a smoke type test to estabilish what draw is on the vent ok, any pointers as to how I would do this? I have tried boiling a kettle under the hood and the steam can be seen going anywhere but into the hood. Smoke matches from a CH merchant Cheers, ta. |
Reply |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
Extracting hot air ... | UK diy |