Common Problems with Wood Burning and Multi-Fuel Stoves and How to Solve Them

Common Problems with Wood Burning and Multi-Fuel Stoves and How to Solve Them

If you’re not an expert in using wood burning or multi-fuel stoves, sometimes the problems or little quirks that happen from time to time can seem quite daunting.

More often than not, it’s very easy to solve whatever difficulty you’re encountering.

Here are a few common problems and some suggestions on how to overcome them.

Difficulty lighting the stove

In most cases, problems with lighting a stove are just down to not using the right materials or not preparing properly. Check out our article on lighting a stove for an in-depth guide to getting your stove going.

Difficulty controlling the stove temperature or overfiring

Believe it or not, your stove can get too hot. If you don’t control the temperature your stove can run so hot that it overfires or damages your stove.

A common cause is too much oxygen getting to the fire. Check all door and glass seals to make sure that’s not the creating the problem. Make sure you’re familiar with all the controls on the stove and proper operation as detailed in the instruction manual.

If it’s a boiler stove, check that the thermostat control flap is clear of debris. In extreme circumstances, consider having a flue stabiliser fitted.

Stove not burning well

The most common cause of this is using damp fuel (read our article on the importance of using properly dried wood).

Make sure you’re burning the type of fuel specified in the instruction manual for your stove (read our article on how to operate a wood burning stove to achieve maximum burning efficiency).

If you’re doing everything correctly, have a professional check your flue for a blockage or other problems.

Stove is smoking

Almost all stoves that are connected to a good chimney will never have smoke or fumes coming into the room.

Smoke in your room usually indicates flue problems. Often a lack of ventilation is responsible. Flues or chimneys need an air supply into the room to be able to remove the smoke effectively.
Another common cause is a cooker ventilation hood in the room or an adjoining room. These hoods can sometimes suck smoke and fumes back down a chimney.

Fireclay flue seals cracking

Cracked fireclay seals around the stove outlet look messy and unsightly. Mix fireclay with heat resistant glass fibre rope, which will bond the fireclay and stop cracks forming.

Paint smelling

New stoves sometimes give off a paint smell when first fired up, but this should disappear after a few days. This happens while the paint is curing. Check your instruction manual for more information.

Prolonged smells for more than 3-4 days suggest some sort of problem. Contact the manufacturer in this case.

Bars or grate have deteriorated

All stove bars and grates deteriorate with use, some faster than others. The type of fuel you use, burn rate and frequency of ash removal are all key factors in their lifespan.

Check your instruction manual to see the best fuel to use. Always avoid petroleum-based fuels - sometimes known as ‘pet coke’. Overfiring your appliance, and leaving the ash pit doors or all air vents open for long periods can also increase deterioration.

Clean your ashes out regularly in a multi-fuel stove to ensure there is an air flow around the bars to keep their temperature down. If the ash pan fills to the point where the ashes touch the bars, there will be premature damage.

Glass dirty and difficult to clean

Most modern stoves have an airwash facility to keep your glass clean when burning (read our blog to find out ‘what is airwash?’). Make yourself familiar with the operation of the airwash by reading the appliance operation manual.

If it’s working well, the airwash will burn soot off the glass when the stove is in use.

The best time to clean the glass by hand is shortly after lighting. Use a damp cloth before the glass gets too hot. The soot will wipe off easily.

Doing this when the glass is too hot will cause the water on the cloth to turn to steam, which should be avoided. Stubborn stains can be removed by dipping your cloth in the ashes in the ash pan and then rubbing the stains.

Using abrasive cleaning fluids or cloths will damage the glass and make it more difficult to clean in future.

If you’ve got a problem that wasn’t answered in this article, please get in touch and we’ll try to write an article to help you.


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Gr8Fires 2015-05-05 15:38:41
@ Colin Evans. Hi Colin, There are a few possibilities but it won't be easy to establish which, if
any, is the cause. One option could be pet coke being burned (for example, if mixed in with your
regular fuel during the production or supply process). The other most likely cause is overfiring (by
burning the stove too hot through either too much fuel or too much oxygen). Thanks.

Gr8Fires 2015-05-05 15:31:00
Hi Yvonne, was it during the cleaning process that the smell was around? If so, it is most likely to
just be the sulphurous content of whatever was burned in the ashes.

colin evans 2015-05-05 15:21:44
Hi I purchased a dunsley highlander 8 Just over two years ago. Unfortunately the grate has
deterioted and broken in parts. not sure why this would happen in such a short space of time? I
regularly empty ash tray and burn mostly smokeless fuel but occasionally wood. I need to replace
the grate but any ideas as to why this should happen? I have been using multistoves for 25 years and
never had this problem before. Many thanks

Yvonne elvin 2015-04-29 09:50:53
Morning I have just cleaned my multi fuel burner and there was an eggy smell is this ok? Thank you.

Gr8Fires 2015-03-17 13:58:07
@George Allan. Hi George, it could be the treated timber creating the smell. It's generally not a
good idea to burn treated wood, due to the fumes and the damage it could cause to the stove system.
Failing that, we'd recommend giving the manufacturer a call to see what they suggest. Thanks.

george allan 2015-03-07 12:29:31
hi there, I keep getting smell from my multi fuel stove I burn wood usually cls timber and off cuts
some timber treated ,fire burns well no smoke in room just smell glass clear wood usually below 20%

Gr8Fires 2015-02-23 10:02:18
@ Jim Dufffy. Hi, it's probably worth getting your installer back out to make sure the system is
balanced. Sometimes needs a bit of fine-tuning. Thanks.

Gr8Fires 2015-02-23 10:00:23
@ Christopher Ogilvie Badenoch. Hi, we don't stock that particular brand so have no experience of
whether or not that is something that affects them. Speaking generally, a throat plate of any brand
can get damaged if the stove is being overfired (i.e. too much oxygen or too much fuel is being
used) or if soot is allowed to settle on top of the plate for a sustained period. Unfortunately, it
is hard to tell from here whether either of those things are causing the problems you've been
experiencing. Thanks.

Jim Duffy 2015-02-21 11:02:35
My multi fuel system is heating radiators but no hot water

Christopher Ogilvie Badenoch 2015-02-20 15:08:20
I have had a Dunsley 'Highlander 5' Multi-fuel stove for the last seven years. It is a very
responsive and easy to operate stove BUT the throat-plate, immediately above the fie-box has had to
be replaced four times since installation. It warps severly - almost beyodn teh point where ti camn
be removed without dismantling the whole stove. I understand that this problem is a very common
fault with a number of brands, some stoves going for only six months before requiring throat-plate
replacement. Replacement is not inexpensive. Surely this is a matter for adequate Trades
Description/Consumer protection? Are there any stoves which are not afflicted by this
problem. C.O.Badenoch

Gr8Fires 2015-02-19 18:20:04
@Neil Cookson. Hi Neil, The answer might be in this
dburner/ Thanks.

Gr8Fires 2015-02-19 18:19:27
@Ralph. Hi Ralph, It is normal for the area around an inset stove. Assuming it is fitted to
manufacturer guidelines, it would only really be a problem if it was a combustible material. You've
indicated it's brick, which can't overheat, so the only issue is if it's causing another safety
problem for your household or stopping enough heat getting into the room.

Neil Cookson 2015-02-19 16:37:34
Hi, my multi fuel boiler stove works well apart from when I open the door to add more fuel when the
fire is lit. When I open the door it sends smoke into the room until the door is closed again. Can
you offer any suggestions to cure this?

Ralph Bradshw 2015-02-16 19:49:40
Hello i Have a brompi inset wood burner fitted.The vent at the top, or just the heat from the wood
burner makes the bricks so hot at the top you cannot touch this what happens. or should they
be a steel plate or something to stop the heat Thanks Ralph.

Gr8Fires 2015-02-10 18:22:39
@Hursev Naim. Hi Hursev Naim, A paint smell is normal for the first 3/4 burns. Have you used it more
regularly than that over the 3 weeks? If so, we'd recommend contacting the manufacturer. Thanks.

hursev naim 2015-02-10 18:15:20
dear sir, hello and how are you from cyprus...3 weeks ago i bought clarke mark new cast iron 3. weeks but its smell not good...i m take paint smell...what will i do???thanx for

David Clarey 2015-02-10 11:36:11
@ Paul Beaton This blowback problem upon lighting your stove is caused by the flue liner being full
of cold air! All chimneys have this problem, but it does not manifest itself in an unlined chimney
which is square in section. As we all know cold air is heavier than hot air and will descend, this
has the effect of stopping the smoke laden hot air from rising by acting as a plug in the
cylindrical section of the modern flue! Conversely an old square section, unlined, chimney does not
have the same problem due to the fact that the rising, smoke laden, hot air can displace the cold
column to the corners and create a path through it! The best solution is to introduce a smokeless
heat into the flue for a few minutes prior to lighting the fire itself. A gas blowtorch is the best
means of doing this! Once the flue has been flushed of the column of cold air the fire can be lit
with no likely hood of smoke blowing back into the room. Sadly this is yet another problem caused
by jobs-worth building regulations, in this case, failing to take into account why chimneys have
been square in section for so long historically.

Gr8Fires 2015-02-08 16:38:40
@Paul Beaton. Hi Paul, The answer might be in this article:

Gr8Fires 2015-02-08 16:36:50
@Adrian Kember. Hi Adrian, Assuming you're doing all the 'obvious' stuff, like not leaving the vents
wide open (which it sound like you would have already thought of), the only thing we can suggest is
to get a couple of Hetas installers out to quote for the second installation and pick their brains
about whether it will work properly. Maybe show them the existing stove in action. Thanks.

Paul Beaton 2015-02-07 18:50:15
Hello, we recenty bought an aarrow ecoburn 5 stove. Everything has been working well until now. We
lit out fire using a fire log to begin with. Unfortunately smoke started to do come out of the air
wash vents. I have been told that this could be blow back because we hadn't used the stove for over
a week and we need warm up the chimney by burning newspaper to begin with. Have tried this and the
paper hardly lights with bellowing smoke again. Seems all strange as the stove has worked well up to
this point. Can anyone offer any suggestions?

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