Temperature · Denver
Why does the display temperature move around all day?
The short answer
Because a refrigerator is never at one temperature. Sub-Zero puts the normal wander at plus or minus five degrees Fahrenheit, driven by the door, the room and the humidity. Sub-Zero Appliance Repair Denver looks at drift beyond that — (303) 729-0972.
$89 service call, credited against the repair.
Before you call
- Note what the panel says at the same hour on three days running, rather than watching it over one afternoon.
- Think back to what went in warm. Sub-Zero asks for several hours before judging a cabinet that has just been loaded.
- Stand a glass of water mid-shelf with a thermometer bulb sunk in it, halfway front to back.
- Leave it twelve hours before you read it. That is what the manufacturer asks for, and shorter tells you nothing.
Stop here and call Sub-Zero Appliance Repair Denver on (303) 729-0972 if the glass reading and the panel reading disagree by more than a few degrees after twelve hours.
What it usually turns out to be
-
Normal cycling
The figure moves within about five degrees either side and settles again within hours of a shop being put away or a door being propped.
Quoted after the diagnosis
-
A condenser carrying dust
The swing widens over months rather than days, the grille is grey when you look through it, and nothing in the kitchen routine has changed.
Quoted after the diagnosis
-
A reading that is not real
The panel disagrees with a thermometer left in a glass of water overnight, which points at what is sensing the compartment rather than at the cooling.
Defrost heater, thermostat or sensor$280–$680
When it is worth a visit
Drift wider than five degrees either side, after the condenser has been cleared and nothing warm has just gone in, is worth a visit. Bring the two numbers with you when you ring: what the panel claimed and what the glass of water actually read.
Measuring it properly
The panel is not a thermometer, or at least not the one that matters. Sub-Zero’s own instructions for checking a cabinet say the figure on the control is the setpoint and that food temperature is the measurement to take, which is a polite way of saying that the number you have been watching all week may not be the number you think.
So take the real one, the way the manufacturer describes it: the bulb under water in the middle of the refrigerator, or under vegetable oil in a freezer, and half a day before you look.
What comes back is a reading you can argue with. If it sits close to what the panel claims, the cabinet is doing its job and the movement you noticed was the door and the room. If it does not, you have something specific to describe over the phone, which is worth more than any amount of watching the display.
Follow-up questions
Is the number on the panel the real temperature?
Not necessarily. Sub-Zero's guidance on measuring says the figure on the control panel is the unit setpoint, and that food temperature is the proper measurement. That is why it tells owners to use a glass of water rather than trusting the display or waving a thermometer in the air.
How much movement is too much?
Sub-Zero calls a wander of about five degrees either way normal, and blames the door, the room temperature and humidity for it. Beyond that, once the condenser is clean and nothing warm has just been loaded, you are no longer looking at weather in the kitchen.
Why use oil for the freezer and water for the fridge?
Both stand in for food, which is what the manufacturer says you should actually be measuring. Water would turn solid in a freezer and read nothing useful, so Sub-Zero says to sink the bulb in vegetable oil there instead. Sub-Zero Appliance Repair Denver reads both before touching a control.
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.