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Faults & repair


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, talk to your local Morsø Dealer. Morsø has the necessary adhesive fibre for glass that can be bought at any Morsø dealer.

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.

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

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 local Morsø Dealer.

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 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 your local Morsø Dealer. Ensure you use MORSO sealing rope.

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. 

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.