What is going on across the RDTM line
New noise from an AVG RDTM refrigerator sorts into three families: a rattle (something loose), a hum or buzz (a fan or a transformer working against resistance), and a rhythmic click or gurgle (which is usually normal operation). On these machines the first family is by far the most common, and it is owner-fixable.
What owners describe
- A knock once or twice a day and never otherwise — On an RDTM model, noise that keeps a schedule is usually the machine working, not failing.
- A rattle or buzz that comes and goes with the cooling cycle — For RDTM models, cycle-linked noise means a fan, the compressor mounts, or tubing vibrating against the cabinet.
- A hum that has grown louder over months — On the RDTM line, gradual growth is a bearing or a fan losing lubrication, not a sudden failure.
- A buzz that follows the ice maker filling — Across the RDTM line, close the supply valve for a day: if the buzz goes, you have found it.
- Vibration you can feel in the floor or the worktop — Where RDTM models are concerned, a cabinet out of level walks on two feet and drums into whatever it is touching.
- NEAR MISS — a buzz with water running into the cabinet — A fill valve buzzing while it leaks is a water fault, not a mechanical one. Go to the water-leak page.
What actually fails on RDTM models, in order
- A cabinet that is not level or is resting on cabinetry — It leads the list because a single foot off the floor turns the compressor into a drum skin — and because the fix is a spanner and five minutes.
- The condenser fan clipping its shroud or a dust ball — It sits here because you can see it: pull the machine out, take off the rear cover and the contact mark is usually obvious. On RDTM models it earns that place.
- Something touching the cabinet or a loose panel — It belongs here because a hand on the cabinet identifies it in seconds and a hand also fixes it.
- A failing compressor — Last, as it should be: a genuinely failing compressor is rare next to everything above and it is licensed work. On RDTM models it earns that place.
Check in this order, and why
- Open the door and listen for the noise to stop — On an RDTM model, the door switch cuts the evaporator fan, so a noise that dies with the door open is that fan and nothing else.
- Check the clearance around and above the cabinet — On an RDTM model, a machine touching a wall or a worktop uses that surface as a soundboard, and the noise doubles.
- Look for a frost sheet on the rear wall inside the freezer — If there is a slab there, treat the defrost problem — the noise is a symptom of it.
Before you take any panel off
Safety
Unplug the refrigerator or switch off its breaker before any cover comes off — a capacitor can hold a charge after the power is off, and a condenser fan will start without warning while you have a hand in it. Never spin a fan blade with the machine live to "see if it is free". The door switch and its harness stay exactly as they are.
Models in the RDTM family
Reference| Model number | Family key |
|---|---|
| RDTM181SE | avg:refrigerator:rdtm |
| RDTM181WE | avg:refrigerator:rdtm |
When this stops being an owner job
The owner line here is anything you can reach with the machine unplugged and a screwdriver. Beyond that — evaporator fan, compressor mounts, sealed-system noise — bring someone in. Call the same day if the noise is accompanied by a burning smell or by a breaker that trips, because neither is a mechanical nuisance.
More RDTM pages
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
