Skip to main content
Error code reference
Bosch Refrigerator Error Code E21
Communication error between DOM (Display and Operation Module) and IWD (Ice Water Dispenser) control module.
SourceBosch Refrigerator - Full Service Manual: BC22CS30SNSp. 41, 48
Diagnostic procedure
The full E21 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 electrical connections and cables between DOM and IWD PCB; replace relevant PCB if necessary.
SourceBosch Refrigerator - Full Service Manual: BC22CS30SNSp. 41, 48
More steps, wiring diagram references, and verified part numbers
Includes expected resistance and voltage values, connector pinouts, and supersession notes for replacement parts.
Unlock E21 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
5 manuals in the MyPros+ library document this code for Bosch refrigerator.
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