The short answer
On a KEG draught cabinet there are two noise sources people confuse: the refrigeration and the gas side. A hiss or intermittent sigh is usually the regulator or a fitting, not the compressor. Separate the two before opening anything, because a hiss is also how a gas leak announces itself. Where these usually stand, the room is the variable that moves most, so start there rather than inside the unit.
What you observe
- A hiss or sigh near the gas bottle or regulator — That is the gas side, and it can mean a leak rather than a noise.
- A rattle from the base at start-up — Usually the cabinet, its feet or a loose panel rather than the compressor.
- NEAR MISS — quiet and warm — That belongs on the page for a cabinet that will not cool.
Causes, most likely first on a KEG refrigerator
- Gas side: regulator, fittings or bottle — Id: gasparts — A hiss or an intermittent sigh comes from the regulator or a fitting rather than the refrigeration, and it is treated as a leak until proven otherwise. First on a draught cabinet because it is the one noise here that is also a safety finding.
- Cabinet not level, or touching something — Id: level — Second: a cabinet on uneven feet, or in contact with a wall or a run of units, passes compressor vibration into the structure and amplifies it.
- Condenser fan, or debris in its path — Id: condfan — Third: the fan at the back or underneath moves air over the hot coil. A worn bearing gives a whirr; anything in the blade path gives a clatter that comes and goes.
- Compressor hum, or its mounts — Id: compressor — Fourth, and less common: a compressor hums under load and can knock as it starts and stops. Hardened rubber mounts turn that into a rattle against the base.
- Refrigerant and defrost noises, which are normal — Id: normalflow — Last, and the reason the order matters: gurgling, trickling and the occasional pop or sizzle are refrigerant moving and defrost water hitting a warm surface. Nothing is wrong.
Check in this order, and why
- Listen at the regulator and brush soapy water on the fittings — Bubbles name a leak without any tool at all. First because it is the top-ranked cause above and costs nothing.
- Rock the cabinet and check its feet and clearances — Any movement, or any contact with a wall or unit, is the finding. Second because its cause ranks second above.
- Look at the fan behind or under the cabinet with the power off — Debris in the blade path shows itself immediately. Third because its cause ranks third above.
What an owner can safely check
- Separate the gas noise from the refrigeration noise — A hiss near the bottle or regulator is the gas side and is checked first.
About 10 min
- Move it somewhere cooler for a day and compare — A few degrees of room temperature change what a small unit can hold.
About 30 min
- Brush soapy water onto the gas fittings and watch — Bubbles find a leak; if you find one, close the bottle and re-seat the fitting.
Tools: soapy waterAbout 15 min
- Level the cabinet and secure the bottle and any loose panel — A cylinder standing free in a cold box rattles and is unsafe as well as noisy.
Tools: spirit levelAbout 20 min
- STOP HERE if the next step needs a panel off with power on — Fan and compressor work behind a live panel is a service call.
Before you open anything
Safety
Unplug the cabinet before removing any panel. Treat the gas side separately: a carbon dioxide cylinder is a pressure vessel, it must stand secured, and a leak in a closed room is a suffocation risk rather than a noise. If you find a leaking fitting, close the bottle valve first.
When to call a technician
Call for refrigeration noise that survives levelling and cleaning. Deal with a gas leak immediately and separately: close the cylinder valve, ventilate the space, and have the fittings replaced rather than tightened repeatedly. Tap, line and regulator parts come from draught suppliers; refrigeration parts come from the seller of the cabinet.
Nearest pages of this class
What this page does not cover
This page covers KEG refrigerators as a class, not one family or model line. Where a family- or model-specific page exists for your unit, that page is the more specific answer. Not here: part numbers, fan ratings and mount specifications. It is draught cabinets built around a keg, a gas bottle and a tap tower rather than around shelves.
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
