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CrumblingCrumbling substrate

… normally results from extreme thermal shock when refueling wet wood. Use seasoned, dried wood only; water content < 15%.

It may also occur when the combustor overheats when the stove is running in high-fire mode. Open damper and by-pass combustor to avoid overheating it. Make sure ash box and combustion chamber are closed properly.

Avoid high draft: do not exceed 15 Pascal (0.06’’ of water). Install manual damper and draft gauge, or a barometric damper. Ask your chimney sweep; he’s the expert who has to approve installation.


Fly-ash build-up and maskingFly AshFly Ash Masking



… occurs when combustor has not maintained light-off temperature. Brush cold Firecat® with a soft- bristled brush or vacuum lightly.



Fly AshFly-ash plugging


… can be avoided by not burning materials that produce a lot of char and fly-ash or when closing the bypass too soon. Don’t burn cardboard, gift wrap paper and garbage. Follow instructions for proper light-off.



Thermal cracks

Thermal cracking


… might be the result of uneven temperatures, flame impingement and heat. If large pieces are falling out, combustor ought to be replaced.



Mechanical cracksMechanical cracks


… may either be caused by mishandling or distortion of holder. Handle with care. Replace combustor if large pieces are missing. Replace any warped stove parts as well. Make sure your catalyst is not held directly by metal parts but by soft material like Interam™ (3m)




Creosote plugging

Plugging with creosote

… is a serious matter for your Firecat®. Burning wet, pitchy woods or large loads of dead wood with the combustor in the operating position without light-off ever occurring will result in this kind of plugging.

Burn dried seasoned wood only. Make sure combustor has lit-off before closing the bypass damper. It may be possible to burn the soot or creosote accumulation off by putting the combustor in a partially open and partially closed position  after a hot fire has been started.


Soot maskingSoot masking


… occurs when the combustor that has either not maintained light-off temperature or from burning coal. Sulfur based compounds will put a coat on the catalyst.

Open by-pass damper partially after a hot fire has been started to burn off the soot accumulation. Revert to burning wood and fire the combustor to elevated temperatures for one hour.

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