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Error code reference

Thermador Refrigerator Error Code 3-1-3

Icemaker

Thermador codesThermador refrigerator codes

Icemaker: Water valve of icemaker faulty.

First step from the service manual

Check water fill valve of icemaker; if problematic replace water valve, if valve is OK replace icemaker.

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

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  • Wiring diagram references and connector pinouts from the OEM service manual
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What 3-1-3 means on a Thermador refrigerator

Error code 3-1-3 on a Thermador refrigerator indicates a fault with the icemaker water fill valve. This is the solenoid-operated valve responsible for supplying water to the icemaker when a new ice-making cycle begins. When the control system detects that this valve is not functioning within expected parameters, it logs the 3-1-3 code and may suspend icemaker operation to prevent flooding or ice production failures.

The water fill valve operates by receiving a voltage signal from the icemaker control board, which energizes the solenoid coil and opens the valve to allow a measured amount of water into the ice tray. A fault can occur due to a failed solenoid coil, an electrically open or shorted winding, wiring damage between the control board and the valve, or a mechanically stuck valve that does not open or close correctly. In some cases, mineral scale buildup from hard water can cause the valve to stick in the open or closed position, triggering the fault.

The recommended diagnostic approach is to inspect the water fill valve directly. If the valve shows signs of electrical failure, such as an open coil or incorrect resistance, or mechanical failure like visible damage or scale blockage, the valve should be replaced. If the valve tests within acceptable electrical parameters and shows no physical defects, the fault may originate within the icemaker assembly itself, in which case the full icemaker unit is the next replacement candidate.

Source: manufacturer service documentation.

Common causes of 3-1-3

  1. 01

    Failed water fill valve solenoid

    Part replacement

    The solenoid coil inside the water fill valve can burn out or develop an open or shorted winding, preventing the valve from operating. This is the most common cause of code 3-1-3 and requires replacing the valve.

  2. 02

    Wiring or connector fault between control board and valve

    Wiring / connection

    Damaged, corroded, or loose wiring between the icemaker control board and the water fill valve can interrupt the signal needed to operate the valve. Inspect the harness and connectors at both ends for continuity and secure seating.

  3. 03

    Mineral scale or debris clogging the valve

    Part replacement

    Hard water deposits can accumulate inside the valve body, preventing the solenoid from fully opening or closing. This is identifiable by restricted or absent water flow even when the solenoid is electrically functional.

  4. 04

    Mechanically stuck or seized valve

    Part replacement

    The valve mechanism can seize in the open or closed position due to wear or debris, causing the icemaker to either flood or receive no water. Physical inspection of the valve and water flow behavior during a cycle can confirm this.

  5. 05

    Faulty icemaker assembly

    Part replacement

    If the water fill valve tests correctly electrically and shows no physical defects, the fault may originate within the icemaker module itself. In this case, replacing the full icemaker assembly is the recommended next step.

See the test procedure for each cause

Frequently asked questions about 3-1-3

What does 3-1-3 mean on a Thermador refrigerator?
Code 3-1-3 on a Thermador refrigerator indicates a fault with the icemaker water fill valve. The refrigerator's control system has detected that this valve, which supplies water to the icemaker during each ice-making cycle, is not operating correctly. The icemaker may stop producing ice as a result. A technician should test the valve and replace it or the icemaker assembly as needed.
Can I fix the 3-1-3 error code on my Thermador refrigerator myself?
A knowledgeable DIYer can inspect the water fill valve for visible damage, check the wiring connections for corrosion or looseness, and confirm the water supply is active and unrestricted. However, testing the solenoid coil electrically and replacing internal components requires some comfort with appliance repair and basic electrical testing. If the valve or icemaker needs replacement, those parts must be sourced and installed correctly to avoid water leaks.
Is it safe to keep using my refrigerator when error 3-1-3 is active?
The refrigerator's cooling functions are generally not affected by a 3-1-3 error, so food storage remains safe. However, if the water fill valve is stuck in the open position, there is a risk of water overflowing into the icemaker or the refrigerator compartment. It is best to address the fault promptly to avoid potential water damage.
How much does it cost to repair error code 3-1-3 on a Thermador refrigerator?
Repair costs depend on whether the water fill valve or the full icemaker assembly needs replacement. A water fill valve replacement typically ranges from around $80 to $200 including the part and labor. If the icemaker assembly itself needs to be replaced, costs can range from $200 to $500 or more depending on the model and local labor rates. Getting a diagnostic inspection first helps avoid replacing parts unnecessarily.
Will resetting my Thermador refrigerator clear the 3-1-3 error code?
A power reset may temporarily clear the code, but if the underlying fault with the water fill valve or icemaker assembly has not been resolved, the code will return once the system runs through another icemaker cycle. Resetting is useful for confirming whether the fault is intermittent, but it is not a substitute for diagnosing and repairing the root cause.

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