Why Is My Dometic DM2672 Making So Much Noise?
If you’re enjoying a quiet evening in your caravan and hear a persistent hum, click, or vibration from the fridge, you’re not alone. The Dometic DM2672 is a popular absorption refrigerator for RVs and motorhomes, but its cooling system can generate more noise than owners expect. Understanding the sources of these sounds—from the burner assembly to the cooling fan—is the first step toward silent operation. This guide focuses on troubleshooting and repairs to help you achieve peaceful camping without waking the neighbours.
What Are the Common Noise Sources in the Dometic DM2672?
The Dometic DM2672 typically produces noise from three main areas: the cooling unit’s burner, the condenser fan, and the movement of ammonia through the system. The burner creates a soft flame sound when operating on gas, which is normal, but a loud roaring or popping indicates incomplete combustion or a blocked flue. The condenser fan, located behind the fridge, can develop rattles if its blades are loose or if debris accumulates on the motor shaft. Additionally, the Dometic DM2672 Ammonia Odor: Diagnosis and Safety Tips guide explains how unusual smells often accompany serious noise changes. A hissing or gurgling sound from the cooling unit may signal air in the system, but this is usually harmless unless accompanied by a loss of cooling performance.
How Can I Reduce Noise from the Burner and Flue?
The burner assembly is a common culprit for excessive noise. Start by checking the burner flame: a healthy flame is blue and steady. If it’s yellow, orange, or produces a loud roaring sound, the burner jets may be clogged with carbon deposits or dirt. Cleaning the burner with a soft brush and compressed air can restore quiet operation. Also inspect the flue pipe for blockages—spider webs or debris can cause incomplete combustion and create a popping noise. For a more thorough approach, consider removing the burner and using a small wire to clear the jet orifice. After cleaning, relight the fridge on gas and listen for improvement. If noise persists, the thermocouple may be misaligned, causing uneven flame; check our Dometic DM2672 Thermistor Calibration: How to Fix Temperature Issues for temperature-related noise problems. Finally, ensure the fridge is securely mounted, as vibration from the burner can amplify through loose brackets.
What Should I Do About a Noisy Condenser Fan?
The condenser fan on the Dometic DM2672 helps dissipate heat from the cooling unit, but over time it can become a source of irritating noise. The first step is to power down the fridge and disconnect it from the mains and gas. Access the fan by removing the lower rear panel (usually held by four screws). With a flashlight, inspect the fan blades for dust, pet hair, or insect nests. Use a can of compressed air or a soft brush to clean the blades and the motor housing. Next, check the fan’s shaft for axial play—if the fan wobbles when turned by hand, the bearing is worn and replacement is necessary. A common repair is to lubricate the fan motor with a few drops of light machine oil through the bearing port (if accessible) to reduce squeaking. If the fan still rattles, replace it with a genuine Dometic part (Part No. 960000742) for around £35 in the UK. Also ensure the fan mounting bracket is tight; loose screws amplify vibrations. For a quieter alternative, some owners replace the OEM fan with a slower-spinning, low-noise model designed for caravan fridges.
How Do I Fix Vibration Noises from the Cooling Unit Itself?
Absorption cooling units like the Dometic DM2672 can sometimes produce a low-frequency hum or vibration that resonates through the RV’s walls. This often stems from the unit touching the fridge enclosure or interior panels. Start by checking the foam insulation around the cooling pipes—if it’s deteriorated, the metal can contact the cabinetry. Apply closed-cell foam tape or rubber gasket material to any contact points. Also check the floor bolts and side brackets that hold the fridge in place; if they’re loose, the entire unit can vibrate. Tighten them to the manufacturer’s torque spec (usually 6-8 Nm). For persistent resonance, consider using vibration-dampening pads under the fridge’s mounting feet. These are available at hardware stores for about £10 per set. If the noise is a gurgling or sloshing sound, it’s likely from the ammonia fluid moving through the system; this is normal, but if it’s loud, you can try tilting the fridge slightly (within the limits specified in the manual) to alter the fluid flow. Never tilt more than 3° off level on the road, as this can damage the cooling unit.
| Noise Type | Likely Cause | Severity Level | Approx. Repair Cost (UK) |
|---|---|---|---|
| Loud roaring from gas flame | Clogged burner jet or flue | Moderate | £0–£15 |
| Rattling from rear fan | Loose fan blade or worn bearing | Low to moderate | £5–£35 |
| Hissing or gurgling from cooling unit | Air in system or normal flow | Low | £0 (unless leak) |
| Loud pop or bang from fridge rear | Expansion/contraction of metal | Low | £0 (check bolts) |
| Vibration through cabinets | Loose mounting brackets | Moderate | £0–£10 |
Can a Faulty Door or Seal Cause Noise Troubles?
While door issues don’t directly produce mechanical noise, a loose or poorly aligned door can create rattling while the vehicle is moving or when the fridge is running. The Dometic DM2672 Door Seal Replacement: Step-by-Step Guide is essential reading if you hear a clicking sound that disappears when you press on the door. A loose seal can flutter against the door frame, while a misaligned hinge can cause the door to vibrate against the cabinet. Check the door latch: if it’s not engaging properly, the door can rattle even on level ground. Also inspect the hinge alignment; our Dometic DM2672 Door Hinge Alignment: Fixing Sagging and Leaks guide will help you adjust the door so it sits flush without clicking. A final check is the internal shelves—loose items can rattle against the door. Secure them with non-slip mats or reposition them.
What Owners Say
Many Dometic DM2672 owners report that the most common noise issue is a clicking sound from the back of the fridge, which often turns out to be the relay for the gas shut-off valve. This is usually harmless but can be annoying. “I found that just tightening the mounting bolts on the back panel stopped the clicking—it was vibrating against a metal bracket,” writes Paul from Cornwall. Another owner, Sarah from York, says her husband cleaned the burner with a pipe cleaner and the roaring noise completely disappeared. A few owners have replaced the condenser fan with a computer-style 120mm fan running at reduced voltage to achieve near-silent operation, although this requires some DIY wiring skills. The general consensus is that 90% of noises can be fixed with simple cleaning and tightening, but persistent roaring or clicking after maintenance may indicate a faulty burner assembly or circuit board, requiring professional repair. “Don’t ignore a loud gurgle—it could be a sign of a cooling unit leak,” warns a forum moderator from the Caravan and Motorhome Club. For safe diagnosis of smells, refer to our Dometic DM2672 Ammonia Odor: Diagnosis and Safety Tips before tackling any noise issues.
Frequently Asked Questions
- Why does my Dometic DM2672 make a clicking sound every few seconds?
This is usually the gas safety relay (thermocouple) cycling on and off. If it’s constant, the flame may be too small or the thermocouple is failing. Clean the burner and check the gas pressure. A new thermocouple costs around £20 and can be fitted by a gas-safe technician. - Is it normal to hear a gurgling sound from the fridge?
Yes, a soft gurgling is normal as ammonia fluid circulates through the cooling pipes. If it becomes loud or is accompanied by poor cooling, there may be a blockage or leak. Check for ammonia smell using our safety guide. - How do I stop the condenser fan from rattling?
First, clean the fan blades and housing. If that doesn’t help, check the fan bearing by spinning the blade manually—if it feels rough or loose, replace the fan. A new fan costs about £30 from a caravan parts supplier. - Can I use spray silicone to quiet a noisy seal?
No, silicone can degrade the rubber seal. Instead, clean the seal with warm soapy water and check for gaps. For a proper fix, see our door seal replacement guide. - Why does the fridge vibrate when running on gas but not on electric?
This is because the gas burner produces a continuous flame, while electric heating elements are silent. Check the burner flame colour—if it’s yellow, it’s incomplete combustion, which causes vibration. Clean the burner jet and flue. - Will a noise-dampening mat help reduce fridge noise?
Yes, applied to the rear panel of the fridge compartment or on the cooling unit brackets, closed-cell foam mats can significantly reduce vibration transfer. Ensure the mat doesn’t block ventilation slots. Cost is around £15–£25 per metre.
