Cleaning and Maintenance

The Vermiculite Plates Or Bricks In My Stove Have Cracked. Should They Be Replaced?

Cracks in the bricks/vermiculite plates may happen due to bumps from the wood. There is no need to replace the bricks even though they are cracked. They do still insulate the fire chamber.

The purpose of the bricks is to insulate the fire chamber to increase the combustion temperature. However, if they start crumbling, the insulation disappears. This may damage the cast iron and they do in this case have to be replaced.

The Sealing Rope In The Door Is Loose, Or Has Come Away. What Do I Do?

The sealing rope in the door becomes worn after it has been in use for some time, and can start coming away. The seal is fitted using Morsø ceramic adhesive.

When replacing the seal, the surface must be cleaned thoroughly with steel wool or a steel brush. Seal kits with adhesive can be bought from Osowarm. Ensure you use Morso sealing rope.

How Do I Remove Scratches And Marks?

If there are marks on the stove or it simply needs painting to freshen it up, you must clean the surface first.

Rust can be removed using fine steel wool, then painted using Morsø Senotherm spray paint (for black Morsø stoves use coke spray). Please note that MORSO stoves are dark grey in colour not black.

The Glass In My Stove Is Covered In Soot. What Could Be Wrong?

You can clean the glass using Morsø Glass Cleanser. This must be done when the stove is cold.

If heavy soot build-ups appear, use treble ammonia water to clean the glass.

Soot may appear on the glass if the combustion temperature is too low or if the air controls are used incorrectly. The secondary air controls must be open and the primary air controls closed. The primary air either from the riddling grate or air control are only to be used during the lighting period or when dry wood is put into the stove.

Morsø recommends a moisture content in the wood of 16-20%. If you wan to be sure that wood is dry enough, a moisture meter can be purchased from your Osowarm.

Is It Unusual For My Stove To Tick?

You can expect a slight ticking noise while the stove heats up or cools down.

There Is Soot In My Chimney. How Did That Happen?

If the temperature is too low you might experience tarry soot in your chimney. The combustion temperature will be too low if not enough air is supplied, compared to the amount of wood. Tarry soot is easily recognised as a brown sticky coat. Supply more secondary air to increase the temperature.

A stove flue thermometer placed on the lower part of the flue pipe will indicate if the air supply is correct. The flue gas temperature must be approx. 250°C. If the flue gas temperature is considerably lower, tarry soot may be created in the chimney. If the flue gas temperature exceeds 250 – 300°C, the inside parts might be superheated.

Smoke Is Coming Out Into My Living Room When I Open The Stove Door. How Do I Avoid That?

The stove must never be operated with the door open, the door should only be fully opened during refuelling.

Smoke may be emitted into the room at the time of refuelling if the stove is burning at a very low rate. To overcome this either turn the stove to full rate, or open the door slightly (1 or 2 cm) for a few minutes before adding any additional fuel.

If the door is left open for too long (2 minutes or so) during the refuel procedure, a large amount of cool air will be drawn into the chimney chilling the flue gases and slowing the draft. This will result in smoke and fumes coming back in the room; the refuelling time should be kept to a minimum.

If smoke is persistent, and the stove is difficult to light and maintain a good burn rate, there may be a problem with the chimney draught- you should consult with your installer or a qualified chimney sweep.

Where Do I Buy Spare Parts For My Stove?

Parts can be purchased from Osowarm. If you are unsure about what type of stove you have, you can find a casting number inside the door. This casting number can identify the Morsø stove.

All parts of Morsø stoves are interchangeable, and we also guarantee Morsø parts are available for a minimum of 10 years after the stove is put out of production.

There Is Not Enough Draught In The Chimney. What Can I Do?

If the chimney is too short, has inadequate insulation or is leaky, there may be problems; get a chimney sweep to check it and measure the flue draft.

If the above possible problems have been eliminated, extend the lighting period, to ensure the chimney is well heated. The draw on the chimney will be greater when it is hot. This is achieved by using lots of kindling and 1-2 firelighters. After igniting the firelighters leave the stove door slightly ajar about 2 to 3cm for 5 to 10 minutes. When the majority of flame have died down and there is a good amount of glowing embers add 2-3 pieces of dry wood and keep the air supply open. On chimneys with slower flue drafts it may be necessary to leave the stove door slightly ajar again until the logs fully ignite. Once a good flame has been established and the door closed the air control can be set to the desired position. If you have an old brick chimney with a large inner diameter, it can be a good idea to reduce the area with a liner. Seek the help of a HETAS engineer, or contact Osowarm.

Do Morso Wood-Burning Stoves Rust?

If looked after and installed properly, the stove will not rust.
If rust appears on the stove, it is usually because the stove has been exposed to moisture, possibly from the chimney.
In summerhouses, the temperature is often very cold in winter and the still air in the combustion chamber can cause condensation on the stove surface. You should therefore leave the valves in the stove open to prevent condensation forming on the oven, which can cause rust. Another good idea is to leave the door ajar when the stove is not being used for a period of time.
The Glass In My Stove Has Cracked. What Has Happened And Can I Replace It Myself?

Cracks on the glass may happen due to bumps from the wood. Besides, impurities may be found in the wood such as pebbles that may hit the glass during the combustion.

If the glass has cracked, it naturally has to be replaced.

Replacing the glass yourself is a fairly simple job. If you’re unsure about your ability or would prefer, then contact Osowarm. Morsø has the necessary adhesive fibre for glass that can be bought from Osowarm.

The Baffle Plate Is Burned Into Pieces. Why Has That Happened, And Can I Replace It?

The baffle is a consumable item that should be changed as needed.

Morsø cast iron stoves have very long life if wearing parts are replaced when they are worn. When letting too much primary air through the grate shaker, the temperature in the combustion chamber becomes very high, and this can shorten the life of the baffle.

Another reason may be that there are ashes and soot on top of the baffle. Soot and ash on top of the baffle should be removed 1-2 times a year, this can be done with a brush or Morsø ash tool.