Skip to main content
Error code reference
Bosch Oven Error Code E305
Communication error: loss of communication between TCM and control module or TCM and user interface.
SourceBosch 800 Series Built-in Wall Ovens - Service Manualp. 33
Diagnostic procedure
The full E305 procedure
Step 1 is visible so you can confirm you are on the right page. The remaining steps, the ones that tell you whether to actually replace a part, unlock with any pass.
MyPros+ · DiagnosticsStep 1 preview
1
First diagnostic step
Check for damaged (cut or pinched) wires or loose connectors. Confirm that voltage is getting to the correct pins on the board.
SourceBosch 800 Series Built-in Wall Ovens - Service Manualp. 33
More steps, wiring diagram references, and verified part numbers
Includes expected resistance and voltage values, connector pinouts, and supersession notes for replacement parts.
Unlock E305 procedure $9.95
Or subscribe: $29/month for all codes plus Max diagnostics, with 70 Max messages a day. Plus applicable tax.
Where this code is documented
2 manuals in the MyPros+ library document this code for Bosch oven.
Models covered by the manuals that document this code
75,000+ service documents · 20,000+ error codes · 100+ brands
Get Started$29/month · Cancel anytime · Or $9.95 3-day pass · Plus applicable tax