Paramedics have been given instructions on how to deal with potential faults, however, the procedure can take up to 5 minutes to complete.
Concerns have been raised by some ambulance workers after a piece of life-saving equipment failed during a recent emergency call-out.
A number of the cardiac devices been removed from service following an error message during call out in south Leinster.
Paramedics have since been given instructions on how to deal with potential faults, however, the procedure can take up to 5 minutes to complete.

Sharp Rise In M9 Collisions With Garda Call-Outs Up Year-On-Year
Councillor Seeks Clarity On How Often Nightclubs and Late Bars In Naas Are Inspected For Fire Risks
New Figures From CSO Reveal How Much International Protection Applicants Earn Compared To Average Worker In Ireland
Unpaid Eight-Month Work And Training Placement For Adults With Disabilities Branded "Extremely Unfair"
Department Of Education Defends Kildare SNA Cuts Amid Claims Of Reduced Need At Some Schools
Naas Nurses Threaten Escalation As Staffing Row Deepens
Driving Tests Face Disruption As RSA Testers To Strike Next Week
Jury Delivers Not Guilty By Reason Of Insanity Verdict In Ballyfin Demesne Strangling Case