4 Fault Isolation 
4.3 Fault Isolation Concepts 
R688   HPM High-Performance Process Manager Service  329 
December 2020  Honeywell   
Table 58 Communications and Control Processor Hard Failure Codes 
Corrective Action 
(See Table 57) 
Change Task Priority call failed. 
Mail box entry has bad MTOS return 
code. 
Pause Timeout if pause selected. 
Mailbox fetch returned illegal code. 
Mailbox send of response returned 
illegal code. 
Mailbox fetch returned illegal code. 
Resume of user's task returned illegal 
code. 
Task ran out of resources; not legally 
possible since there are more of these 
than SMS buffers. 
Wait for event flag returned illegal 
code. 
Reset of event flag returned illegal 
code. 
IF_action passed in MSG_if_rec is not 
supported. 
Reserved for future IOI Subsystem 
crash codes. 
Mail box send returned illegal code. 
Set of event flag for CCITrn task failed. 
Reset of IMR event flag failed. 
Wait for IMR event flag failed. 
Timed set of event flag failed. 
Mail box send to DBIRET failed. 
Setting of CClbuf EF failed. 
Timed set of event flag failed. 
Wait for mailbox or timeout EF failed.  
Test of timeout EF failed. 
Reset of mailbox event flag failed. 
Reset of CClbuf EF failed. 
Wait for CClbuf EF returned illegal 
code.