To fix a fireplace damper that won't close, clear debris (like ash or twigs) from the track and spray the hinges with a high-temperature lubricant like WD-40. If the mechanism is misaligned or broken, you may need to replace the damper plate or opener mechanism entirely.
In general, homeowners can expect to pay between $150 and $500 for a standard chimney damper replacement. One of the most significant factors that affect the cost of chimney damper replacement is the type of damper.
If a damper is damaged it may lose the ability to open or close using the pull system. If a damper won't open it is not safe to use your fireplace because smoke will not be able to escape and will back up into your space.
Tip: Spray WD-40® Specialist® Spray & Stay Gel Lubricant on your chimney damper (top and/or bottom) to protect it from rust and to ensure it continues to open and close properly.
If it sticks or does not turn at all it could be a couple things. If it sticks rust may have developed somewhere in the gear assembly. So some WD-40 sprayed onto the gear assembly should do the trick. If it does not turn at all it could be rusted completely OR the worm can be bent from heat damage.
Problem: One of the most frequent issues homeowners face with fireplace dampers is that they can get stuck, either in the open or closed position. A stuck damper can lead to energy loss, allowing warm air to escape in winter or hot air to enter in summer.
Use only a moli-spray oil or similar graphite based oil as regular lubricating oil will attract dirt. Bearings. Synthetic, oil impregnated, and ball bearings without grease fittings require only minimal grease.
THE FIRE PLACE
It is not recommended to use a chimney without a damper, as this can lead to heat loss, reduced efficiency, and the risk of smoke and other combustion gasses entering the living space. If your chimney does not have a damper, it is important to have one installed.
When looking for a damping grease alternative, it depends on what you are fixing. Standard lubricants like lithium grease or WD-40 are too thin and will cause parts to slip. Instead, use heavy silicone-based greases (like PMS-60000), high-viscosity synthetic oils (e.g., Super Lube 51004), or specialized heavy lubricants like Tribosyn PG44A.
Some of the reasons a chimney damper won't close properly include shoddy installation, age-related damage, or heavy snow or ice affecting a top-sealing type.
Put the damper into an open position and check the registers once again to see if the airflow starts. If the damper is closed and you are feeling low airflow, or none at all, it is most likely a bad damper. For the automatic control damper, turn your HVAC system on. Check for airflow in the registers.
How to Repair a Chimney Damper
A competent person is someone with the training, knowledge, experience and equipment to install, test, inspect and maintain fire dampers safely and accurately. For us, competence means: Understanding current British Standards such as BS 9999 and BS 9991. Being trained in both mechanical and HVAC safety.
Most homeowners insurance policies will cover chimney repairs caused by sudden and accidental events, such as fires, storms, or falling trees. Damage from wear and tear, poor maintenance, or construction defects is usually not covered.
Three of the most common factors are illustrated here, including: obstruction, failed linkage and failed actuator. Obstruction is one of the most common factors contributing to damper failure.
While WD-40 is a great multipurpose solvent, it is a poor long-term lubricant and should never be used on items that require specialized lubricants, come into contact with food, or are made of sensitive plastics and rubber.
To lubricate your fan motor, use a lightweight, non-detergent machine oil like sewing machine oil, Zoom Spout turbine oil, or blue-label 3-in-1 oil. Avoid using standard WD-40 (which is a cleaner, not a lubricant) or heavy-duty greases, as they can gum up the motor and attract dust.
Crompton is proudly recognised as the World's No. 1 Ceiling Fans' Brand, a milestone built on 85+ years of trust, innovation, and performance that brings comfort and reliability to millions of homes.
WD-40 is a fast-evaporating solvent and rust penetrant best used for cleaning gunk and freeing stuck parts. White lithium grease is a heavy-duty lubricant that stays where you apply it, providing long-term, water-resistant protection for high-friction moving parts.
It is not recommended to use Vaseline on fishing reels. While it seems like a convenient household lubricant, petroleum jelly melts in warm weather, can destroy certain plastics, and causes rubber seals to swell, which will ultimately ruin the reel's internal mechanics.
Depending on your specific application, the best grease substitute varies. For heavy-duty mechanical or automotive parts, try lithium-based alternatives or anti-seize lubricants. For plumbing or O-rings, silicone lubricants are ideal. For baking, standard vegetable oil or cooking sprays work perfectly.
You must open the damper fully before lighting a fire. This allows smoke and gases to escape through the chimney instead of coming back into the house. If the damper's closed, you risk carbon monoxide buildup, which can be dangerous.
14 Common Gas Fireplace Problems & What to Do
Short answer: people are ditching fireplaces. From dodging draughts and dust to embracing cleaner, cheaper heating, old hearths are out and modern solutions like Electric Fire Suites are in. Keep reading to explore the lifestyle, health, and eco reasons behind this cosy-but-smart home trend.