The short answer
On the FR line, the most common reason a freezer is not freezing is airflow blocked by a frosted evaporator. On this page that cause is ranked ahead of temperature sensor or control board reading wrong, which is where the order departs from the brand-generic article above; the ranking below says what about this platform moved it. Only one of the causes below is owner-checkable without tools, and the last of them is a service call.
What you see on the FR line
- The cabinet is warm but the unit is clearly running — The compressor hum is there and the light comes on, yet the air inside is no colder than the room after several hours.
- A sheet of frost on the freezer rear wall — Not the light dusting a freezer normally carries, but a continuous white slab over the panel that hides the evaporator.
- The freezer is still cold but the fresh-food side is not — A split like this points at airflow between the two compartments rather than at cooling itself, and it is the single most useful thing you can notice.
- NEAR MISS — the unit is silent and the light is out — That is a power, cord or main-board fault, not a cooling fault, and it is a different page.
Causes, most likely first on the FR line
- Airflow blocked by a frosted evaporator — The defrost cycle stops clearing the evaporator, frost builds into a slab, and the slab blocks the only path cold air has into the cabinet. The unit keeps running because the sensor it trusts never sees the temperature it wants. It ranks first because it is the fault that produces exactly this pattern — a running unit and a warm cabinet — and because it arrives slowly enough that nobody notices until the cabinet warms. The table below lists 21 models under one family key, so treat the page as covering the whole of that list unless a step below says otherwise.
- Temperature sensor or control board reading wrong — A thermistor that has drifted reports a cabinet colder than it is, and the board then runs the wrong cycle or none at all. Nothing sounds wrong because, electrically, nothing is. It ranks below the mechanical causes because it is genuinely less common, and because the mechanical ones have to be excluded before a board can fairly be blamed.
- Sealed-system or compressor fault — A leak, a restriction or a compressor that no longer pumps ends the cooling entirely. The motor often still hums, which is exactly why this cause belongs at the end of a list rather than the start of one. It ranks last on purpose: it is rare, it is expensive, and every cause above it has to be cleared before it is a fair conclusion.
Check in this order, and why
- First: Look behind the freezer rear panel for a frost slab — Ice visible around the panel seams settles the question before any tool comes out. It comes first because it is the cheapest of the three to exclude and because everything below it is harder to read while it is unresolved.
- Second: Compare a shelf thermometer against the panel — Do this only after the airflow checks, or you will chase a reading that was correct all along.
- Third: Only after the checks above: is the condenser cold and the evaporator dry? — A condenser that never gets warm while the compressor runs points this way. Stop there and call.
Before you open anything
Safety
Unplug the appliance or switch off its breaker before removing any panel — a capacitor can hold a charge after the power is off. Leave the door switch wired exactly as it is; it cuts the fan for a reason, and defeating it to watch the fan spin means putting a hand near a moving blade with power on. Never put a heat gun or a hair dryer against an evaporator to speed a defrost: the tubing behind it is thin, and one hole in it turns a cheap repair into a sealed-system job.
Models in the FR family
Reference| Model number | Family key |
|---|---|
| FR1400BREV | conserv:freezer:fr |
| FR1400SREV | conserv:freezer:fr |
| FR1400SS-N | conserv:freezer:fr |
| FR1400SSEL | conserv:freezer:fr |
| FR1400SSER | conserv:freezer:fr |
| FR1400W-N | conserv:freezer:fr |
| FR1400WREV | conserv:freezer:fr |
| FR1700BREV | conserv:freezer:fr |
| FR1700EL | conserv:freezer:fr |
| FR1700ER | conserv:freezer:fr |
| FR1700SREV | conserv:freezer:fr |
| FR1700WREV | conserv:freezer:fr |
| FR2000BREV | conserv:freezer:fr |
| FR2000SREV | conserv:freezer:fr |
| FR2000WREV | conserv:freezer:fr |
| FR300BG | conserv:freezer:fr |
| FR300SG | conserv:freezer:fr |
| FR300WG | conserv:freezer:fr |
| FR430B | conserv:freezer:fr |
| FR430S | conserv:freezer:fr |
| FR430SC | conserv:freezer:fr |
When to call a technician
Call when the frost, the fan and the condenser have all been ruled out, and call at once if the cabinet has been above safe temperature long enough to matter for the food. A refrigerator holds food safely at 40 °F (4 °C) or below and a freezer at 0 °F (−18 °C) or below; past that the repair decision is no longer the urgent one.
