mypros+
Error code reference

Thermador Refrigerator Error Code 3-2-5

Icemaker

Thermador codesThermador refrigerator codes

Icemaker: Icemaker inlet water heater problem.

First step from the service manual

Check resistance of the inlet water heater (US: 7kOhm, EU: 33kOhm); if OK replace the icemaker.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

MyPros+ Max

Get the full diagnostic procedure for 3-2-5.

  • Step-by-step tests with expected resistance, voltage, and continuity values
  • Wiring diagram references and connector pinouts from the OEM service manual
  • Verified part numbers when replacement is required
Get the full procedure

$29/month · Cancel anytime · Or $9.95 3-day pass

What 3-2-5 means on a Thermador refrigerator

Error code 3-2-5 on a Thermador refrigerator indicates a problem with the icemaker inlet water heater. This component is a small resistive heating element located at the water inlet of the icemaker assembly. Its function is to prevent ice from forming at the inlet valve or feed tube, ensuring water can flow into the icemaker mold during harvest and fill cycles. When the control board detects an abnormal signal from this heater circuit, it logs error 3-2-5 and may suspend icemaker operation.

The primary diagnostic step involves measuring the resistance of the inlet water heater using a multimeter. For US-market units, the target resistance is 7 kilohms. For EU-market units, the correct value is 33 kilohms. A reading that is open (infinite resistance) indicates a broken heating element, while a reading that is shorted or far outside the specified range points to internal heater failure. These resistance values give technicians a clear pass or fail threshold without ambiguity.

If the inlet water heater resistance measures within specification, the fault is likely internal to the icemaker control circuitry rather than the heater element itself, and the entire icemaker assembly should be replaced. This is because the heater and its monitoring circuit are integrated into the icemaker unit and cannot typically be serviced independently. Wiring harness integrity between the control board and the icemaker connector should also be inspected before condemning the icemaker, as a loose or corroded connector can produce the same fault signal.

Source: manufacturer service documentation.

Common causes of 3-2-5

  1. 01

    Failed inlet water heater element

    Part replacement

    The resistive heating element inside the icemaker inlet has burned out or broken open. This is confirmed when a multimeter reads infinite resistance instead of 7 kilohms (US) or 33 kilohms (EU).

  2. 02

    Shorted inlet water heater

    Part replacement

    The heater element has shorted internally, producing a resistance reading significantly below the specified value. This also triggers the fault code and requires icemaker replacement.

  3. 03

    Loose or corroded wiring connector

    Wiring / connection

    The connector between the icemaker harness and the main wiring loom may be loose, corroded, or damaged, causing an intermittent or false open-circuit reading. Inspect the connector pins for corrosion and reseat the connection before replacing any parts.

  4. 04

    Damaged wiring harness

    Part replacement

    The wire leads running to the inlet water heater may be chafed, pinched, or broken. A visual inspection and continuity test of the harness from the control board to the icemaker can confirm this.

  5. 05

    Icemaker control board fault

    Part replacement

    If the heater resistance measures correctly at 7 kilohms or 33 kilohms and the wiring is intact, the fault monitoring circuit within the icemaker assembly itself may have failed. In this case the icemaker unit should be replaced.

See the test procedure for each cause

Frequently asked questions about 3-2-5

What does 3-2-5 mean on a Thermador refrigerator?
Error code 3-2-5 indicates a problem with the icemaker inlet water heater. This small heating element sits at the water inlet of the icemaker and prevents freezing at that point. The control board has detected that the heater circuit is not operating within acceptable parameters, so it logged the fault and may have disabled icemaker operation. Testing the heater resistance is the first step toward diagnosing the root cause.
How do I fix error code 3-2-5 on my Thermador refrigerator?
Start by disconnecting power and measuring the resistance of the inlet water heater using a multimeter. On US units the correct value is 7 kilohms, and on EU units it is 33 kilohms. If the reading is open or far outside those values, the icemaker assembly needs to be replaced. If the heater reads correctly, inspect the wiring harness and connector for damage or corrosion before replacing the icemaker.
Is it safe to use my Thermador refrigerator while error 3-2-5 is active?
The refrigerator and freezer compartments will generally continue to cool normally while this error is active, since the fault is limited to the icemaker inlet heater circuit. However, ice production will likely be affected or stopped entirely. You can continue using the refrigerator for food storage, but the icemaker should be serviced promptly to avoid potential water inlet issues.
Will resetting my Thermador refrigerator clear error code 3-2-5?
A power reset may temporarily clear the error code from the display, but the fault will return if the underlying problem with the inlet water heater or its circuit has not been repaired. The code is a symptom of a hardware failure, not a software glitch, so resetting alone is not a fix. The heater resistance and wiring must be tested and corrected to resolve the error permanently.
How much does it cost to repair error code 3-2-5 on a Thermador refrigerator?
Repair costs depend on whether the fix involves only a wiring repair or a full icemaker assembly replacement. Wiring connector repairs are relatively inexpensive, while icemaker assembly replacement typically ranges from a few hundred dollars to over five hundred dollars depending on the specific model, parts pricing, and labor rates in your area. Thermador refrigerators are premium appliances, so parts costs can be higher than average.

Related Thermador refrigerator codes

All Thermador refrigerator codes
View all 49 Thermador refrigerator codes

78,000+ service manuals · 160,000+ error codes · 55+ brands

Get Started

$29/month · Cancel anytime · Or $9.95 3-day pass