Mean Time Between Failures (MTBF) is the average time an asset operates between one failure and the next. In Zoho FSM, MTBF is derived from the asset’s service history: the time between consecutive reactive (unplanned) Work Orders for the same fault type on the same asset. A higher MTBF indicates a more reliable asset that requires less frequent emergency intervention. Tracking MTBF in FSM helps service managers and customers make informed decisions about asset replacement versus continued maintenance.
A declining MTBF trend on a specific asset signals that it is becoming less reliable and that the current maintenance interval may no longer be sufficient. If an asset that previously failed every 12 months now fails every 6 months, the preventive maintenance schedule should be reviewed and potentially made more frequent. MTBF data from FSM provides the evidence base for these adjustments, moving maintenance decisions from guesswork to data.
Aggregating MTBF across all assets in a category reveals which equipment types are inherently more reliable. If one brand or model of equipment has a significantly lower MTBF than competitors in the same category, this data can inform procurement decisions, justify a manufacturer escalation, or prompt a product recommendation change to customers when replacement is required.
MTBF is calculated by dividing the total operating time of an asset over a period by the number of failures in that period. In FSM terms, count the reactive (unplanned) Work Orders on an asset over a defined timeframe, then divide the total period duration by that count. For example, 3 failures in 12 months gives an MTBF of 4 months. FSM reports can surface the reactive Work Order count per asset to support this calculation.
MTBF measures the reliability of equipment: how long does it work before failing? MTTR measures service response efficiency: how quickly is it fixed when it does fail? Both are needed for a complete picture of field service performance. A high MTBF means the asset rarely fails; a low MTTR means when it does fail, it is fixed quickly. The ideal is high MTBF and low MTTR combined.
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