For a service contractor the van is the shop, and its condition sets the first-time fix rate. Two things degrade quietly: stock, which drains through small unlogged uses until the common part is missing on the call that needed it, and instruments, which drift. A recovery scale reading four percent low means every charge is wrong and every refrigerant log entry is wrong with it — including the numbers the leak-rate calculation depends on.
The steps ChatterFix schedules for this PM. Every step is a checkable item on the work order — a technician can speak their way through it without touching a keyboard.
For a service contractor the van is the shop, and its condition sets the first-time fix rate. Two things degrade quietly: stock, which drains through small unlogged uses until the common part is missing on the call that needed it, and instruments, which drift. A recovery scale reading four percent low means every charge is wrong and every refrigerant log entry is wrong with it — including the numbers the leak-rate calculation depends on.
Return visits, and a return visit is the most expensive hour a contractor sells: the drive is paid twice, the customer's confidence is spent, and the call often cannot be billed the second time. Uncalibrated gauges are worse because the work looks completed — a system charged by a drifting scale gets signed off, runs badly, and comes back as a callback that reads like a new fault.
Quarterly for stock and instrument checks. Calibration certificates follow the instrument manufacturer's schedule, usually annual, and recovery cylinders have a hydrostatic test date of their own that is easy to let lapse. Track those dates as assets, not as a checklist item someone remembers.
This procedure — and every other PM for your industry — is already built into ChatterFix. Pick your industry and it lands on the right equipment, on the right interval, in about three minutes.