Bosch · Washing Machine
Bosch Washing Machine E26 Error Code
Analog pressure sensor out of range
What this error means
E26 (F26) reports a fault in the analogue pressure sensor circuit—the air dome tube from the tub to the pressure switch sent resistance outside calibrated limits, so the board cannot confirm fill or drain level.
How E26 is detected
When E26 appears on a Bosch washing machine, the control board has confirmed that water did not leave the machine within the programmed drain window. On Bosch WAT28400UC, Bosch WGA12400UC, and similar variants, the drain pump runs for a fixed interval—often three to seven minutes on washers and dishwashers—while a pressure switch or turbidity sensor verifies the tub or sump is empty. If water remains, the cycle stops to prevent spin with a full tub or overflow on the next fill.
Most E26 calls are resolved without parts: unplug and trace the clear pressure hose from the tub dome to the top control area. Restricted drain paths mimic pump failure because the impeller spins against a blocked hose or filter. Document whether the pump hums audibly during the drain step; a humming pump with no water movement points to a clogged filter or kinked hose, while silence may indicate a failed pump motor or loose wiring at the harness.
After clearing blockages, run a short cycle and listen at the drain hose for steady water flow. If E26 returns on the next load with a clean filter and straight hose, measure resistance at the pump motor connector per the service manual for your model before ordering a replacement pump assembly.
Common causes
- Pressure dome hose disconnected from the tub nipple
- Cracked or kinked clear hose between tub and control panel
- Pressure sensor failure after prior E23 flooding
- Main board pressure input circuit damaged
Step-by-step fixes
- 1Unplug and trace the clear pressure hose from the tub dome to the top control area
- 2Reconnect any loose hose ends and inspect for pinholes or cracks
- 3Ensure the tub is empty before restart—water trapped can skew pressure readings
- 4Run a short rinse after hose verification
When to call a technician
E26 with a verified intact pressure hose usually requires pressure sensor or main PCB replacement.
Affected models
- Bosch WAT28400UC
- Bosch WGA12400UC
- Bosch WGG254AXUC
Prevention & maintenance
- Clean drain filters and hose terminations monthly on high-use washing machines to prevent E26 from lint and food debris buildup.
- Record when E26 appears in the cycle and whether it clears after a 60-second power reset on your Bosch washing machine—that detail speeds diagnosis if you call service.
- Keep the model and serial number from the rating plate when ordering parts for E26; Bosch uses multiple revisions with different harness lengths and board firmware.
- Photograph wiring connector orientation before disconnecting any component while troubleshooting E26; reversed plugs on pumps and valves cause immediate repeat faults.