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Bosch SMV59T10EU Dishwasher - Error E:04, Water Not Heating, Contactors & Troubleshooting

MikiKQ 19632 11
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  • #1 17263105
    MikiKQ
    Level 8  
    Posts: 32
    Rate: 3
    Board Language: polish
    Welcome. I have a problem with the dishwasher - it does not heat the water - the controller does not supply voltage to the heater. Two contactors are responsible for its work. When the heater is to turn on, one contactor (its coil) shows 9V, while the other only 0.8V. It works normally only washes in cold water and at the end of the program the error E: 04 is thrown. Can someone suggest where to look next?
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  • #2 17263300
    Piotr2608

    Level 41  
    Posts: 5372
    Help: 849
    Rate: 4471
    Board Language: polish
    Most likely you have a damaged heater - the heater shorts to ground.
    Company Account:
    ZimTech Piotr Zimny
    Przy Bażantarni 13/31A, Warszawa, 02-793 | Tel.: 666-XXX-XXX (Show) | Company Website: https://zimtech.com.pl
  • #3 17263304
    MikiKQ
    Level 8  
    Posts: 32
    Rate: 3
    Board Language: polish
    How to check it to be 100% sure? Because here the heater comes from the turbine for almost PLN 600.
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  • #4 17263308
    Piotr2608

    Level 41  
    Posts: 5372
    Help: 849
    Rate: 4471
    Board Language: polish
    MikiKQ wrote:
    How to check it to be 100% sure?

    The meter on the heater connectors - the meter is set to measure ?
    Company Account:
    ZimTech Piotr Zimny
    Przy Bażantarni 13/31A, Warszawa, 02-793 | Tel.: 666-XXX-XXX (Show) | Company Website: https://zimtech.com.pl
  • #5 17263341
    MikiKQ
    Level 8  
    Posts: 32
    Rate: 3
    Board Language: polish
    The heater has 3 wires - 2 red and 1 green - yellow (I think). There is about 20k between the two reds but there is nothing between any red and the yellow one.
  • #6 17263348
    Piotr2608

    Level 41  
    Posts: 5372
    Help: 849
    Rate: 4471
    Board Language: polish
    20 k??

    And what is this meter and with what maximum measuring range ??
    Company Account:
    ZimTech Piotr Zimny
    Przy Bażantarni 13/31A, Warszawa, 02-793 | Tel.: 666-XXX-XXX (Show) | Company Website: https://zimtech.com.pl
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  • #7 17263370
    MikiKQ
    Level 8  
    Posts: 32
    Rate: 3
    Board Language: polish
    Error - 20?
  • #8 17263386
    Piotr2608

    Level 41  
    Posts: 5372
    Help: 849
    Rate: 4471
    Board Language: polish
    Piotr2608 wrote:
    20 k??
    And what is this meter and with what maximum measuring range ??

    And what is the range of the meter? Shall we now exchange posts one by one?

    E04 - zeolite heater shorted to ground, pump-heater shorted to ground; the dishwasher continues to run without heating. Replace: the zeolite heater, replace the pump-heater
    Company Account:
    ZimTech Piotr Zimny
    Przy Bażantarni 13/31A, Warszawa, 02-793 | Tel.: 666-XXX-XXX (Show) | Company Website: https://zimtech.com.pl
  • #9 17263419
    MikiKQ
    Level 8  
    Posts: 32
    Rate: 3
    Board Language: polish
    I can set 200, 20k, 200k, 2000k on the meter. But I checked three wires from the heater and only the two red ones have resistance. I am asking because this is the entire element that costs exactly PLN 596 - this is 1/4 of the value of a new dishwasher.

    Added after 7 [hours] 12 [minutes]:

    Could you tell me where this zeolite heater is? Is it in the attachment?
    Attachments:
    • Bosch SMV59T10EU Dishwasher - Error E:04, Water Not Heating, Contactors & Troubleshooting 1528404426152162371303.jpg (2.91 MB) You must be logged in to download this attachment.
  • #10 17264420
    MikiKQ
    Level 8  
    Posts: 32
    Rate: 3
    Board Language: polish
    I already know that it is not a heater. For me, there is no heater in the zeolite tank. Unless I'm blind ? This zeolite is these red pebbles and is combined with a salt reservoir?
  • #11 17264490
    Piotr2608

    Level 41  
    Posts: 5372
    Help: 849
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    The one in the picture above is the regeneration valve.
    Company Account:
    ZimTech Piotr Zimny
    Przy Bażantarni 13/31A, Warszawa, 02-793 | Tel.: 666-XXX-XXX (Show) | Company Website: https://zimtech.com.pl
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  • #12 17269132
    mrice
    Moderator of Home appliances  
    Posts: 13763
    Help: 2172
    Rate: 6848
    Board Language: polish
    MikiKQ wrote:
    I already know that it is not a heater. For me, there is no heater in the zeolite tank. Unless I'm blind ? This zeolite is these red pebbles and is combined with a salt reservoir?


    No, if the zeolite is present, it is in the tin box on the left side (viewed from the front of the device).
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Topic summary

✨ The Bosch SMV59T10EU dishwasher is experiencing an E:04 error due to water not heating, with the controller failing to supply voltage to the heater. Users suspect a damaged heater, as one contactor shows 9V while the other only 0.8V. Resistance measurements indicate that only the two red wires of the heater show approximately 20k ohms, while the yellow wire shows no continuity. Discussions reveal confusion regarding the zeolite heater's location, with clarifications that it is not present in the zeolite tank but rather in a separate component. Recommendations include checking for shorts to ground in the zeolite heater and pump-heater, and considering replacement parts if necessary.
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FAQ

TL;DR: Bosch SMV59T10EU no‑heat + E:04 points to 2 heater paths; "E04 - zeolite heater shorted to ground" and wash continues cold. For owners fixing no‑heat, test heaters to earth and check contactors. [Elektroda, Piotr2608, post #17263386]

Why it matters: You can confirm a ground‑faulted heater and avoid a needless PLN 596 replacement.

Quick Facts

What does Bosch dishwasher error E:04 mean on SMV59T10EU?

E:04 indicates a heater ground fault. It points to the zeolite heater or the pump‑heater. The program continues, but heating is disabled. “E04 - zeolite heater shorted to ground” is the service cue. Replace the failed heater assembly after confirming with measurements. [Elektroda, Piotr2608, post #17263386]

Where is the zeolite module located on this Bosch?

If fitted, the zeolite module sits inside a tin box on the left side when you face the machine. Check that enclosure rather than the softener compartment. This helps distinguish the drying heater from other parts. [Elektroda, mrice, post #17269132]

Will the dishwasher still run the cycle with E:04?

Yes. With E:04, the controller lets the cycle finish but without heating. You will get a cold wash and the fault display. This behavior isolates heater faults from other system errors. [Elektroda, Piotr2608, post #17263386]

I see two heater contactors; one coil reads ~9 V and the other ~0.8 V—what does that imply?

Those readings were recorded when heating should start. They show uneven relay drive at that moment. The unit still washed cold and finished with E:04. Focus your checks on the heater circuits before suspecting the control board. [Elektroda, MikiKQ, post #17263105]

How do I test the heater for a short to ground with a multimeter?

  1. Disconnect power and access the heater connectors.
  2. Remove the two red leads from the heater terminals.
  3. Set the meter to resistance and measure each red lead to the green‑yellow earth; continuity indicates a ground short. Use this before ordering parts. [Elektroda, Piotr2608, post #17263308]

What did the heater wiring measure in this case?

The heater had three wires: two red and one green‑yellow earth. There was resistance between the two red leads. There was no continuity between either red lead and earth. These observations came from the affected unit. [Elektroda, MikiKQ, post #17263341]

Is the part next to the salt reservoir the zeolite heater?

No. The part shown in that area is the regeneration valve for the softener. It is not a heater. Avoid replacing the wrong component. [Elektroda, Piotr2608, post #17264490]

Is the zeolite system combined with the salt softener?

No. The zeolite pack, if present, is a separate assembly. It is housed in a left‑side tin box, not within the salt/softener container. This prevents misidentification during diagnostics. [Elektroda, mrice, post #17269132]

How much might replacing the heater assembly cost?

A user quoted PLN 596 for the pump‑heater assembly. They estimated this as about one‑quarter of a new dishwasher. Confirm the fault first to avoid unnecessary expense. [Elektroda, MikiKQ, post #17263419]

Which parts should I replace to clear E:04?

E:04 points to two targets: the zeolite heater or the pump‑heater. The dishwasher will run but not heat until the fault is cleared. “Replace: the zeolite heater, replace the pump‑heater.” Verify with a meter before ordering. [Elektroda, Piotr2608, post #17263386]

Do all SMV59T10EU units have a zeolite heater?

Not necessarily. The guidance states, “if the zeolite is present,” it sits left‑side in a tin box. That wording implies some variants lack zeolite. Confirm presence before troubleshooting that circuit. [Elektroda, mrice, post #17269132]

What multimeter ranges were mentioned during troubleshooting?

The meter used offered 200, 20k, 200k, and 2000k ohm ranges. These ranges were referenced while checking the heater and earth continuity. [Elektroda, MikiKQ, post #17263419]

Could the heater be shorted to ground in this fault?

Yes. The diagnosis given was, “Most likely you have a damaged heater - the heater shorts to ground.” Confirm by measuring from heater terminals to the green‑yellow earth. Replace the failed assembly if confirmed. [Elektroda, Piotr2608, post #17263300]
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