Skip to main content
Error code reference
Mitsubishi Air Conditioner Error Code E.1
Option fault - contact fault between inverter and plug-in option at connector 1.
SourceMitsubishi Packaged Rooftop Air Conditioner - Service Manual: Precedent eFlexp. 114
Diagnostic procedure
The full E.1 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 that the plug-in option is plugged into connector 1 properly.
SourceMitsubishi Packaged Rooftop Air Conditioner - Service Manual: Precedent eFlexp. 114
More steps, wiring diagram references, and verified part numbers
Includes expected resistance and voltage values, connector pinouts, and supersession notes for replacement parts.
Unlock E.1 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
1 manual in the MyPros+ library documents this code for Mitsubishi air conditioner.
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