The short answer
A freezer that runs continuously and still drifts warm has usually lost its seal or its ability to reject heat, not its refrigerant. Both of the likely causes are owner-checkable and neither needs a part. Put a thermometer in the cabinet overnight rather than trusting the display. A freezer holds food safely at zero degrees Fahrenheit or below, and knowing how far off it is changes what you check. On a Summit freezer the cause that ranks first is condenser coil blanketed in dust.
What you observe
- The compressor never stops running — The cabinet never reaches its target, whatever the cause.
- A solid sheet of frost on the rear wall of a frost-free cabinet — The defrost system has stopped clearing the coil.
- Food is soft or partly thawed but the cabinet is clearly running — Cold is being made; it is not keeping up with the losses.
- NEAR MISS — the cabinet is silent and nothing is cold — That is a power or start-relay fault, and it is a different page.
Causes, most likely first on a Summit freezer
- Condenser coil blanketed in dust — The coil cannot reject the heat the compressor removes, so the machine runs continuously without ever getting the cabinet down. It ranks first on a Summit freezer because there is very little slack behind the panels of a compact cabinet, so anything that restricts restricts completely.
- Door or lid not sealing, or left ajar — Warm humid air enters continuously, frost builds fast, and the cabinet never recovers between door openings. Second on this platform: a cabinet opened often, or one whose lid is held up by a packet, never gets the chance to catch up.
- Defrost stalled, evaporator iced over — On a frost-free cabinet the heater stops clearing the coil, frost builds into a sheet and airflow stops while the compressor runs on. Ranked here because it applies to frost-free cabinets, and on one it is a leading cause that builds quietly over weeks.
- Thermostat or control set wrong, or drifted — A mechanical dial knocked while loading, or a control that has drifted with age, leaves the cabinet running to the wrong target entirely. Last, and the reason to work down the list rather than guess: on a mechanically controlled cabinet a knocked dial is the likeliest single explanation and it is free to check.
Check in this order, and why
- Feel the coil area for heat and look for a dust blanket — A covered coil is visible, and it is the cheapest cause to fix.
- Run a sheet of paper round the seal and check the lid or door closes on its own — A seal that does not grip paper is admitting air constantly.
- Empty the cabinet and look for a solid sheet of frost on the rear wall — A sheet rather than a dusting is the answer.
What an owner can safely check
- Unplug the cabinet and vacuum the coil and its grille thoroughly — Twice a year in a house with pets, or in a garage or outbuilding.
Tools: vacuum, soft brushAbout 25 min
- Clean the gasket and the sealing face, re-seat any lifted section and clear anything obstructing the door — Check nothing inside is holding the lid a fraction open.
Tools: cloth, paperAbout 15 min
- STOP HERE if the next step needs a meter on live terminals or a panel off — That is where an owner check ends and a service call begins, whatever the ranking above says.
Before you open anything
Safety
Unplug the cabinet or switch off its breaker before removing any interior panel — a capacitor can hold a charge after the power is off. Never cut, open or attempt to recharge a sealed refrigerant line, and get help to move a loaded chest cabinet.
When to call a technician
Call once the seal, the coil, the control and the defrost are all clean and the cabinet still will not hold temperature: what is left is the sealed system. On a compact machine, expect access to be the larger half of any labour quote — the part itself is rarely the expensive part.
Nearest pages of this class
What this page does not cover
This page is written for the Summit freezer as a class, not for one family or model line. Where a family- or model-specific page exists for your unit it is linked above, it is the more specific answer, and it is the one to read first. Deliberately not here: part numbers, wiring colours, panel removal order and torque figures, all of which differ between families under the same nameplate.
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
