Our machine room aircon system broke down last week and the temperatures have been all over the place.
After a few days of summer clothing and a few nights of temperature alarms, it was diagnosed to be a refrigerant gas leak from the chiller on the roof. The bad news is that this takes 2 weeks to fix. Luckily the estates engineer was very efficient and organised the delivery and connection of a backup chiller on the last day of term, then personally looked in over Easter to keep an eye on it.
It has been stable the last few days so I've just brought the cluster back up. The site will come out of downtime this evening.