IRF - сбой реле интерфейса?

The HMI (чел. маш. интерфейс) has self-supervision ability. It also displays the IRF codes of the base relay if the base relay is in energized condition.

HMI can display IRF codes from base relay only if HMI is powered through base relay.
HMI however can display its own IRF codes when powered through both battery and base relay.

IRFs considered for base relay are:
Relay EEPROM Failure
....