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
- E:04 flags a ground fault in the zeolite heater or pump‑heater; the cycle continues without heating. [Elektroda, Piotr2608, post #17263386]
- Reported coil readings during a heat call: about 9 V on one contactor coil, 0.8 V on the other. [Elektroda, MikiKQ, post #17263105]
- Heater leads observed: two red and one green‑yellow (earth); no continuity to earth was measured. [Elektroda, MikiKQ, post #17263341]
- Quoted pump‑heater assembly cost: PLN 596 (about one‑quarter of a new dishwasher). [Elektroda, MikiKQ, post #17263419]
- Zeolite module location: tin box on the left side viewed from the front. [Elektroda, mrice, post #17269132]
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?
- Disconnect power and access the heater connectors.
- Remove the two red leads from the heater terminals.
- 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]
