Thermador · Troubleshooting
Thermador Refrigerator Not Cooling
When a Thermador column or bottom-freezer runs warm, the cause is most often a mode or setting, a door that is not sealing, a dusty condenser at the toe kick, a stopped fan, or a defrost fault that has iced the coil. Sealed-system failures happen too, and on the 36-inch bottom-freezers they usually hit only one of the two compartments.
$79 service call, applied to the repair. Monday to Saturday, 8 AM to 7 PM.
In short: the number on the display is the temperature you asked for, not the one inside, so measure first. VACATION, ECONOMY and SABBATH hold the refrigerator near 45°F on purpose. Check the breaker, the toe kick grille, and whether DOOROPEN shows with the door shut. If only one side of a bottom-freezer is warm, the fault is in that side's own system.
Checks you can make before calling
- Measure the real temperature. Put a thermometer in a cup of water in the middle of the compartment, keep the door shut for a few hours, then read it. Air near the door or the coil swings too much to mean anything.
- Look for a mode. VACATION, ECONOMY and SABBATH raise the refrigerator set point to about 45°F and the freezer to about 3°F, and Sabbath also turns off lights, alarms and the ice maker. On the 70 and 800 generations the Vacation key ends both Vacation and Sabbath, and ECO ends when you change a set point.
- Read any message. DOOROPEN with the door closed, LOWPOWER, HIGH VOLT, a code starting with E, or a flashing ALARM symbol each mean something specific; write it down. When the freezer alarm flashes, one press of ALARM OFF silences it and briefly shows the warmest temperature the freezer reached.
- Check the power. Look at the breaker and, if the unit is on a GFCI outlet or breaker, whether it tripped. One reset is fine. A second trip means a fault, often a defrost heater leaking to ground on bottom-freezers, so leave it off and call.
- Clear the toe kick. The condenser breathes through the grille at the bottom. With the power off at the breaker, vacuum the grille and keep rugs and storage away from it.
- Close every door and drawer. Let each swing shut from halfway. Ice around the freezer drawer gasket, or a panel brushing the cabinet beside it, means air is getting in.
What it usually turns out to be
With settings ruled out, in roughly the order we find them:
A door or drawer that is not sealing
What it usually is: heavy custom panels pull doors out of line, and the bottom-freezer drawer can settle with a gap along its lower edge. Humid air leaks in, frost forms at the gasket, and the compressor runs longer and longer.
What you can check: close the door on a strip of paper at several points; it should drag everywhere.
What we do: realign the doors, adjust the drawer at its bracket, set the height at the rear rollers and replace flattened gaskets.
Condenser clogged at floor level, or its fan stopped
What it usually is: these units draw air at the toe kick, right where dust and pet hair travel, and a matted coil or stalled fan leaves the compressor running hot until both sections warm. The low-voltage fan follows the room temperature, so it can be quiet in a cool kitchen without being broken.
What you can check: the grille and as much coil as a vacuum can reach, power off.
What we do: clean the coil, then test the fan, its driver and the room sensor that sets its speed.
Demo mode after repeated fan faults
What it usually is: a showroom setting: lights, display and buttons work, nothing cools. The bottom-freezer control of around 2012 enters it by itself after three condenser fan failures, and keeps it through a power cut. On earlier 70-series bottom-freezers the power key ends it.
What you can check: a unit that looks normal but never runs: no compressor hum, no cold air.
What we do: repair the condenser fan, then take the control out of demo mode. Clearing the mode alone only brings it back.
Evaporator fan, or a door switch stuck on open
What it usually is: the control stops the compartment fan whenever the door switch reads open, so a failed fan, ice on its blades or a stuck switch leaves a frozen coil and warm shelves. Short bursts or a pause right after a defrost or a door opening are normal.
What you can check: DOOROPEN with the door shut, and air moving at the top of the compartment a few minutes after closing.
What we do: run the fan from the test program, measure the module output, and replace the part that failed.
Defrost failure and an iced coil
What it usually is: the defrost heater, the coil sensor, a frozen drain, or the thermal fuse on the coil, which must be replaced once it opens. The section cools well for a while, then fades. A failed coil sensor shows no code in normal running, only when the control's self-diagnosis is run, which is why these faults get missed.
What you can check: frost on the cover at the top of the compartment, a fan that scrapes, water under the crispers. Leave the ice alone.
What we do: test heater, fuse and sensor, clear the drain and melt the coil. Thermador refrigerator repair shows where these parts sit.
Stop valve, inverter or power module
What it usually is: many units have a magnetic stop valve that shuts when the compressor rests and opens just before it starts; if it stays shut, the compressor runs and the coil stays warm. Units built before about December 2010 could jam it in very hot conditions. On variable-speed models, a failed inverter or power module can look exactly like a dead compressor.
What you can check: nothing; from outside these look like any cooling failure.
What we do: test the valve and the compressor electronics before ordering anything, so a compressor is not ordered when the electronics are at fault.
Refrigerant leak
What it usually is: a leak at a joint, the coil or the tubing. On US bottom-freezers the copper tubing in the compressor compartment is a known corrosion spot, and the result is one compartment that stops while the other carries on.
What you can check: nothing safely. Never try to add refrigerant.
What we do: find the leak, repair it with LOKRING compression joints, fit a new drier and refill the system with its exact factory charge. If the leak was on the low-pressure side, moisture may have reached the compressor oil, and Thermador's procedure then replaces the compressor too; you hear that before the quote. See sealed-system repair.
How the cause differs by model
- Refrigerator columns (IR models): one compressor, one coil. A warm column beside a cold freezer column is that column alone, and a frosted top cover points to defrost rather than refrigerant.
- Freezer columns (IF and ID): a warm freezer stops the ice maker first. On the 800 generation, the 18-inch freezer column has a variable-speed compressor, while the wider freezer columns use a simpler single-speed one, so the likely causes differ by size.
- 36-inch bottom-freezers (IB and IT): two separate systems, refrigerator compressor on the left, freezer on the right. One warm side rules out half the unit. The tubing corrosion, GFCI trips and demo mode above belong to this group.
- 900 generation (from about 2017): stored fault codes read by a technician, and sealed-system work done from the front.
Bosch and Gaggenau built-ins on the same platform behave much the same way. For other brands, see Sub-Zero not cooling and Viking refrigerator not cooling.
Protect the food and the unit. Once a thermometer shows the refrigerator above 40°F, move perishables to a cooler with ice and keep the freezer shut; food-safety guidance is to throw out perishables that have been above 40°F for more than two hours. These cabinets are top heavy and anchored against tipping, so never pull one out of its opening yourself, and never cut or puncture tubing.
What the repair costs
The service call is $79. It covers the trip and the diagnosis and is applied to the repair once you approve the written price. Typical ranges:
Built-in refrigerator and freezer repair (Sub-Zero, Thermador, Viking, Monogram, Miele)
| Repair | Typical price, parts and labor |
|---|---|
| Condenser cleaning and performance check | $150 to $250 |
| Condenser fan motor | $350 to $600 |
| Evaporator fan motor | $350 to $650 |
| Temperature sensor (thermistor) | $250 to $450 |
| Defrost heater or defrost termination | $350 to $650 |
| Water valve | $300 to $550 |
| Door gasket, per door | $300 to $600 |
| Door hinge or closer cam | $300 to $650 |
| Ice maker assembly | $450 to $900 |
| Electronic control board | $650 to $1,300 |
| Refrigerant leak repair and recharge | $900 to $2,000 |
| Evaporator replacement | $1,200 to $2,500 |
| Compressor replacement (sealed system) | from $2,000 |
Typical Orange County ranges for parts and labor. The $79 service call is applied to any of them. Parts that ship from the manufacturer and older or discontinued models can run higher. You get the exact written price after the diagnosis and before any work starts.
For a leak or compressor, see the repair or replace guide and the pricing page. Thermador is part of our built-in refrigerator repair service, with the rest of the Thermador kitchen.
Talk to the technician first
Monday to Saturday, 8 AM to 7 PM. The $79 service call is applied to the repair.
Thermador refrigerator not cooling: questions
My Thermador display says 37°F but the milk is warm. Which is right?
The milk. The display shows the set point you chose, not a measurement. A thermometer in a glass of water on a middle shelf, read after a few hours, gives the real temperature.
Why is my Thermador refrigerator warm when the freezer is cold?
On a 36-inch bottom-freezer the sections have separate compressors and coils, so the fault is in the refrigerator system: its fan, defrost, sensor, a leak, or on models that have one, its stop valve. Columns are separate appliances anyway.
Should I turn my Thermador off and on to reset it?
Once, with its power key, is fine. If it warms again, leave it running, write down any message on the display and call; repeated restarts hide the fault and do not fix it.
Why does my Thermador keep tripping the GFCI?
Something inside is leaking current to ground. On bottom-freezers the defrost heater is the usual culprit, and Thermador revised those heaters in 2011. Leave the circuit off and call rather than resetting it again.
Can a dirty condenser stop a Thermador from cooling?
Yes, and it clogs sooner than people expect because the air comes in at floor level. Vacuum the grille every few months and have the coil cleaned yearly.
How long does a Thermador take to cool down after a repair?
A refrigerator section usually settles within several hours and a loaded freezer within a day. Super cooling, which runs about six hours, speeds the refrigerator up.
Is it worth fixing a Thermador with a refrigerant leak?
Often, when the cabinet, doors and panels are sound, because a replacement must match the opening and usually needs new panels. We locate the leak first and quote in writing, including whether the compressor goes with it.