Noise · Denver
Is gurgling or hissing normal?
The short answer
Usually nothing. Sub-Zero puts gurgling and hissing down to refrigerant moving, meltwater running away after a defrost, or a drain that is partly blocked, and calls those sounds normal. Sub-Zero Appliance Repair Denver only wants the new ones — (303) 729-0972.
$89 service call, credited against the repair.
Before you call
- Notice when it happens. Gurgling in the hour after a defrost is meltwater finding its way out, and that is the system working.
- Listen for where it sits. Hissing from low down at the back is refrigerant; a gurgle higher up is usually water.
- Compare the display against the settings Sub-Zero publishes, because a compartment run too cold can freeze water in the drain.
- Ask yourself whether it is new. A sound that has always been there is a different thing from one that started this month.
Stop here and call Sub-Zero Appliance Repair Denver on (303) 729-0972 if the gurgling arrived alongside water inside the cabinet or under the front edge.
What it usually turns out to be
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Refrigerant on the move
A hiss or a soft trickle from the back, most obvious when the room is quiet, and it stops and starts with the cycle.
Quoted after the diagnosis
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Meltwater leaving after a defrost
A gurgle that runs for a while and then stops, on a rhythm of several hours rather than several minutes.
Quoted after the diagnosis
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A drain tube partly blocked
The gurgle gets thicker, it takes longer to clear, and water starts showing on the floor of the cabinet.
Quoted after the diagnosis
When it is worth a visit
Book a visit when the sound is new, when it is getting louder, or when it will not go away — those are the three the manufacturer names. A gurgle arriving with water inside the cabinet points at the drain, and on several generations that tube is cleared by a technician.
Which sound is which
Two different things are being described by one page here, and they come from opposite ends of the appliance. Hissing is the sealed side: refrigerant changing pressure and state as it goes round, loudest from low at the back, and nothing an owner is meant to act on.
Gurgling is water. Frost builds on the cold surfaces during normal running, a defrost clears it on a schedule, and what melts has to leave by a trough and a tube. You hear that journey. A tube that is beginning to close up makes the same journey take longer and sound heavier, which is the one version of this noise that turns into a repair.
The tell is time, not volume. Note the hour it happens, note whether anything is wet, and the rest follows.
Follow-up questions
Is hissing a sign the refrigerant is leaking?
Not by itself. Sub-Zero puts hissing down to the refrigerant moving round the system, which is exactly what it is supposed to do, and lists the sound as normal. A leak announces itself by what the appliance stops doing, not by the noise it makes.
The gurgling has got louder this month. What now?
That is the one case the manufacturer flags: a noise that is new, that grows, or that will not stop. Thicker gurgling usually means water sitting somewhere it should be running. Sub-Zero Appliance Repair Denver will follow the drain route on the visit — (303) 729-0972.
Do the temperature settings have anything to do with it?
They can. Sub-Zero points out that running a compartment colder than its published setting can freeze water inside the drain tube, and a part-frozen tube gurgles as it clears. Putting the settings back where the manufacturer has them is a fair first move.
Talk to someone
Still doing it after the checks?
Say what changed and in what order, and the technician packs for that fault rather than for a guess. Technicians work 8:00 am to 8:00 pm, any day of the week, and the line takes a call 24/7.