Bosch
SGX78C***
Dishwasher
Bosch SGX78C*** — Error Code E02
Bosch SGX78C*** error code E02: Heater relay failure.
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Last updated:
Methodology: We combine manufacturer references with recurring service patterns, then review for safe, step-by-step repair guidance.
Sources: Manufacturer fault-code sheets, service manuals, and recurring field-repair patterns.
Limits: Guidance is informational and may not match every model-year or revision. Confirm with the official manual and diagnostics before replacing parts. For safety-critical or electrical work, use a qualified technician.
Looking for the full diagnosis and repair guide? View complete Bosch Dishwasher error code E02 guide →
Repair guidance: the symptoms and steps below come from the canonical Bosch Dishwasher E02 guide and apply to SGX78C*** unless your manual says otherwise.
Symptoms on SGX78C***
- ⚠️ Dishes not clean or dry
- ⚠️ Water not heating
- ⚠️ Long cycles
How to Fix Error E02 on SGX78C***
- 1 Unplug the dishwasher for 60 seconds then plug back in — this resets the control board and clears many temporary faults
- 2 Test the heating element with a multimeter — replace if no continuity ($20–$80 part)
- 3 Check the thermal fuse — a blown fuse means there was overheating, also check the vent
- 4 If the error persists after basic troubleshooting, contact a qualified appliance technician
🛠️ You'll need: Multimeter, Screwdriver set, Nut driver
· Time: 30–60 min
Questions People Also Ask for Error E02
What does Bosch Dishwasher error code E02 mean? ▼
Error code E02 on a Bosch Dishwasher means: Heater relay failure. The appliance detected this condition and has stopped or limited operation to prevent further damage.
How do I fix Bosch Dishwasher error code E02? ▼
First, unplug the dishwasher for 60 seconds to reset the control board. If error E02 returns, the root cause (heater relay failure) needs to be addressed — check connections, filters, and hoses before calling a technician.
Is it safe to use my Bosch Dishwasher with error code E02? ▼
It depends on the cause. Most E02 errors mean the appliance has stopped itself as a safety measure. Check the 'Should I unplug it?' section above for specific guidance on this error.