Brand: Miele
Category: Dishwasher
Document Type: Parts/Service
Language: EN
Brand: Miele
Category: Dishwasher
Document Type: Parts/Service
Language: EN
Uploaded: Nov. 21, 2025, 8:12 p.m.
Manual Publish Date: 2015-01-01
| Fault Code | Symptom | Cause | Remedy |
|---|---|---|---|
| F79: Circulation Pump Interaction Fault | The program is interrupted and the drain pump is operated. | Faulty interaction between the frequency converter electronic of the circulation pump and the electronic (SLT). | 1. Check for supply voltage. a. Measure the voltage at the electronic (SLT) output and input. b. Measure the voltage at the wiring harness. c. Measure the voltage at the circulation pump. 2. Carry out appropriate remedial action (replacement of the electronic, wiring harness or circulation pump). |
| Frequency converter electronic defective. | Replace the circulation pump. See Section 050-4.13. | ||
| Control electronic (SLT) defective. | Replace the control electronic. See Section 100-4.5 or 100-4.6. | ||
| F84: Slide Shutter Positioning Fault | The program is interrupted and the drain pump is operated. | Position switch defective. | Replace the circulation pump. See Section 050-4.13. |
| Drive (synchronous motor) defective. | Replace the circulation pump. See Section 050-4.13. | ||
| Slide shutter mechanism defective. | Replace the circulation pump. See Section 050-4.13. | ||
| Turbidity sensor connection wires open-circuited. | Check the connection wires for continuity. | ||
| F85: Slide Shutter Signal Change Fault | Even though the slide shutter has not been activated, a signal change has been detected at the position switch. If the fault is registered before the circulation pump has been activated for the first time (or before program start), the program is interrupted and the drain pump is operated. If the fault is registered later, the fault message will be indicated in the display at the end of the program. | Position switch B3/12 defective; intermittent contact. | 1. Check for dirty contacts; clean or replace circulation pump as necessary. 2. Check for pulses during operation at ST14 on the electronic, using a multimeter set for low-voltage DC. If there are pulses every 30 seconds, then replace the electronic (Section 100-4.5 or 100-4.6). If there are no pulses, replace the circulation pump (Section 050-4.13). |
| Electronic defective. | Replace the electronic. See Section 100-4.5 or 100-4.6. | ||
| F86: Salt Container Lid Contact Fault | If the fault is detected during a program, the program will be interrupted and the drain pump will start. The display reads Close salt container lid. If the fault is detected before the start of a program, the message Close salt container lid will be displayed. | Lid not closed. | Close lid. |
| Magnet missing. | Replace the salt container lid. | ||
| Reed switch magnet defective. | Replace the reed switch magnet. | ||
| F88: Turbidity Sensor Fault | If this fault is registered, the program is not interrupted. The fault will only be indicated when the fault memory is checked in the service mode. If this fault is registered, the program continues with default settings. | False or no values from turbidity sensor. | 1. Check the turbidity sensor for correct function. 2. Replace the top spray arm feed pipe with turbidity sensor, if necessary. See Section 050-4.4. |
| Foreign objects in the measurement path. | Check for foreign objects in the measurement path. Remove blockage or replace feed pipe (Section 050-4.4) if necessary. | ||
| Turbidity sensor connection wires open-circuited. | Check connections to electronic board and turbidity sensor B3/10 and perform a continuity check. | ||
| F91: Load Size Registration Inactive | If this fault is registered, the program is not interrupted. The fault will only be indicated when the fault code memory is checked in the service mode. | Water has collected in tipped-over dishes. Subsequent water fill is not successful. | Place dishes in the machine with care. |