What iC1 / iC2 Means
iC1 is a MACS bus communication error, signaled after three attempts to establish communication. iC2 is an ADSI communication error; the program is suspended and can restart once the condition clears. Both are internal bus failures between electronic modules.
Common Causes of iC1 / iC2
- Internal communication harness loose
- Board communication circuit failing
🔧 One Safe Check You Can Try
Reset at the breaker. If the codes repeat, book service.
⚠ Why You Shouldn't Go Further Than That
- Bus problems need service mode to identify which module drops off.
- Boards are replaced as matched assemblies.
Opening a panel to inspect or repair something yourself doesn't automatically cancel your manufacturer's warranty — but it can risk accidental damage, and some manufacturers do have specific service conditions. Check your product's warranty terms, or ask us, before deciding.