The short answer
Pellet stoves need little but regular attention. Empty the ash and clear the burn pot as often as your manual says, often daily when the stove is in heavy use, and wipe the glass when it is cool. Once a year, ideally before the season, have the flue, exhaust fan and heat exchanger cleaned and the seals checked by a professional.
Why pellet stoves need regular cleaning
Pellet stoves burn compressed wood pellets fed automatically into a small burn pot. They are efficient and convenient, but they are also sensitive: a few millimetres of ash in the wrong place can stop air flowing, upset the sensors and make the stove fail to light or shut down mid-evening.
Most faults people call about in winter are cleaning problems, not breakdowns.
Good fuel makes a big difference to how much cleaning a stove needs. See choosing and storing wood pellets.
Before you start: safety
- Only clean when the stove is switched off and completely cold.
- Unplug it if the manual says to.
- Use a vacuum designed for ash. Ordinary vacuums can be damaged by fine ash, and warm embers can start a fire inside them.
- Follow your manufacturer’s manual. Stoves differ, and the manual takes priority over any general guide.
Your routine
| How often | What to do |
|---|---|
| Daily, or every few days in heavy use | Remove the burn pot and clear ash and clinker from it, especially the air holes |
| When it fills | Empty the ash pan |
| Weekly | Clean the glass when cold; brush or vacuum ash from the firebox |
| Monthly, in the season | Clean any accessible areas the manual lists, such as the heat exchanger scrapers or rods |
| Once a year | Professional clean and service (see below) |
Clearing the burn pot
Lift out the burn pot, tip the ash into a metal container and clear the air holes with a small brush or the tool supplied with the stove. Hard lumps of clinker should come away with gentle scraping. Make sure the pot sits back exactly in place, because a misaligned pot is a common reason for lighting failures.
Cleaning the glass
Wipe with a damp cloth dipped in a little fine ash, then polish dry, or use a stove glass cleaner. Never use abrasive pads. If the glass blackens very quickly, the stove may need its air settings checked or a service.
Pellet storage
Keep pellets indoors and dry. Damp pellets swell, crumble into dust and burn badly. Do not tip the dust from the bottom of the bag into the hopper.
What needs a professional
Some parts of a pellet stove are not designed for owners to reach, and some need tools or knowledge to clean without damaging them. Once a year, ideally before the season, a professional service typically covers:
- Cleaning the flue and exhaust pipe
- Cleaning the exhaust (combustion) fan
- Cleaning the heat exchanger passages
- Checking and cleaning sensors
- Checking door and glass seals and replacing worn gaskets
- Checking the stove’s operation and settings
Owners who burn the stove every day through a long winter may need a second clean mid-season.
Signs your stove needs attention now
- It will not light, or lights and goes out
- Flames look lazy, dark orange or sooty
- The glass blackens within hours
- Smoke or a burning smell comes into the room
- Unusual noises from the fans
- Error codes on the display
Start with the burn pot. If clearing it does not help, book a service rather than repeatedly restarting the stove.
If your stove will not light at all, our guide on why a pellet stove won’t light walks through the causes in order.
Carbon monoxide
Pellet stoves burn fuel just like a wood burner, so fit a carbon monoxide alarm in the room. Our chimney and stove safety guide explains where to put it and what to do if it sounds.
Book ahead
clear.mt arranges pellet stove servicing across Malta and Gozo. Pellet stove servicing is in short supply and demand peaks from October to January. Booking a service early in autumn, before you need the stove every evening, is the surest way to avoid a long wait.