The short answer
Start from a failed or obstructed evaporator fan: on a Tappan refrigerator that is the likeliest explanation for what you are looking at, and a sealed-system or compressor fault is the least likely. Most of this you can settle before anyone is called.
What the symptom looks like
- The cabinet is warm while the unit is plainly running — You can hear it working. The air inside is not cold and has not been for a day or more.
- Frost has built into a sheet on the freezer back wall — Not the usual light dusting but a solid layer, which is airflow stopping rather than cold failing.
- NEAR MISS: the unit is silent and nothing is cold — That is a no-power or start-relay fault and it belongs on a different page. Leave this one.
Causes ranked for this brand, likeliest first
- A failed or obstructed evaporator fan — The fan behind the freezer rear panel moves cold into the cabinet. When it stalls, cold is made and never delivered. First on Tappan because the installed base is old, and on an old machine the parts that have been moving the longest fail first.
- Door gaskets no longer sealing — A hardened gasket lets room air in continuously. The unit runs without stopping and the interior never settles. Next, and relatedly: the gasket compound on a value build hardens sooner, so the seal is live well before the machine is old.
- A condenser coil blanketed in dust — The coil sheds the heat the system removes. Covered, it cannot, and the unit runs constantly without pulling the cabinet down. Third on this build, because vent runs collect over years, and nobody has cleared this one recently.
- A sealed-system or compressor fault — The system has lost charge or the compressor is no longer pumping. The unit runs and never gets cold anywhere. Last, and the order is the point: it is the least likely cause here and the only one that is not an owner fix.
Check in this order, and why
- Open the freezer and listen for the fan with the door switch held in — It tells you in seconds whether cold is being moved at all.
- Close the door on a sheet of paper and pull it out — Anywhere it slides out freely is a gap the unit is fighting all day.
- Feel the condenser area for heat and look at the coil — A coil that is hot and furred tells you where the heat is stuck.
The checks you can do yourself
- Hold the freezer door switch in and listen for the fan — Silence with the compressor running is the answer. Do not reach in while it is powered.
Tools: a torchAbout 10 min
- Test the gasket with a sheet of paper at several points around each door — Wash the gasket and the frame first. Food residue holds a gasket open more often than age does.
Tools: a sheet of paperAbout 15 min
- Pull the unit out, vacuum the condenser coil and the fan grille behind or beneath it — This is the single most productive owner check on any refrigerator and it needs no skill.
Tools: a vacuum, a soft brushAbout 30 min
- STOP HERE: anything past this point needs gauges on the sealed system — That is licensed work and it is where an owner check ends.
Safety first, and it is not a formality
Safety
Unplug the appliance or switch off its breaker before removing any panel. A capacitor can hold a charge after the power is off. Get help before pulling the cabinet out: a loaded unit runs away from you on a hard floor and the supply line behind it tears easily. Never open sealed-system tubing.
When this stops being a do-it-yourself job
Call once the coil is clean, the gaskets pass the paper test and a full defrost has not restored cold. Call immediately for oil near the compressor or a burning smell: oil outside the tubing means the system is open. A refrigerator holds food safely at 40 degrees F (4 degrees C) or below, so treat a cabinet above that for hours as a food decision first.
Where to go next in this class
What this page leaves to a more specific one
This page is written for the Tappan refrigerator as a class, not for one family or model line. Where a family-specific page exists for your unit it is linked below and it is the more specific answer. Deliberately not here: wiring colours, part numbers, board pinouts and service-mode sequences, which all differ by family.
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
