The man completed his sentence last week, but said that, during his confinement, the alarm that should only be triggered when he stepped outside the perimeter of his home was triggered twice when he was not outside it.
Another time the strap on the unit was faulty, again triggering the alarm.
The Corrections Department said it would investigate what happened, but believed the man's experience was probably an isolated incident.
The man, who did not want to be identified, was serving a six week home detention sentence after pleading guilty to obtaining goods by deception.
He said he was twice contacted because the alarm was triggered, which should only have happened if he went outside the perimeter of the area he had to stay in (his home address) between 6pm and 5am.
"This may seem trivial, but what it means is that twice in the last six weeks I have been called and accused of not being home, when in fact I am in bed in the middle of the night."
Each time he got a follow-up visit from a probation service officer, at which he received new units.
Twice the officer had called the monitoring company while standing beside the man inside the perimeter and the company had informed him that the man was outside the premises, according to their information, the man said.
He was concerned that faulty units could lead to people on home detention having time added to their sentence.
"I see it as a worry that people can, for this reason, be falsely accused."
The Corrections Department said the case appeared to be unique and it was looking into it.
"I can assure you that offenders are not being mistakenly charged with breaches of electronic monitoring due to equipment faults," community probation and psychological service area manager Monique Cunningham said.
"Enforcement action for offenders on community detention is taken based on the consideration of material such as electronic monitoring reports from the provider, information from the offender and other relevant sources of information."
The Otago Daily Times is seeking answers to further questions from the Corrections Department under the Official Information Act .
