The Daikin controller on the wall is flashing U4. The system won’t respond to any commands — no heating, no cooling, fan won’t start. The facility manager tries powering it off and on from the controller, but U4 comes straight back every time. Staff are asking questions, the building is uncomfortable, and nobody on site...

Another batch of TripAdvisor reviews just dropped. “Room was lovely but the air conditioning didn’t work.” “AC was making a terrible noise all night.” And the classic: “The room smelled musty — like damp.” Three different complaints, three different rooms, all pointing at the same underlying issue — HVAC maintenance that’s been allowed to slip....

Your phone buzzes at 6:47 AM. It’s an alert from the monitoring system: server room temperature 28°C and climbing. The setpoint is 22°C. You pull up the BMS remotely — both AC units showing offline. By the time you drive to site, it’ll be 35°C in there. Your servers are heading for thermal shutdown, and...

First cold Monday morning in October. Staff walk into the office and it’s 14°C inside. The heat pump is running — you can hear the outdoor unit humming — but the air coming out of the ceiling cassettes is cool. Not warm. Not lukewarm. The system was cooling perfectly all summer, and now it won’t...

The thermostat on the wall reads 21°C. The room feels like 26°C. Staff are complaining, productivity is dropping, and the facilities manager is staring at a controller that insists everything is fine. This mismatch between what the thermostat reports and what people actually experience is one of the most frustrating HVAC problems in commercial buildings...

Three indoor units running perfectly. The fourth — nothing. It’s blowing air, but it’s room temperature at best. Maybe the display is flashing an error code, maybe it’s completely blank. Either way, one unit on the multi-split system has dropped out and the rest carry on like nothing happened. This is one of the most...

An office manager in a Farringdon serviced office block called us because tenants on the top floor were complaining about a grinding noise coming from above. It had started as a faint rumble a week earlier and progressed to a sound one tenant described as “like a shopping trolley being dragged across a car park.”...

An office manager in Holborn described the problem perfectly: “The AC makes a noise like it’s starting up, runs for about two minutes, then clicks off. Five minutes later it does the same thing. It’s been doing it all day and the office is getting warmer.” That’s short cycling — the compressor starts, runs briefly,...

A facilities manager in a Moorgate office block rang us in a mild panic because every indoor unit on three floors was flashing an error code simultaneously. Fifty staff sitting in a building with no climate control, the MD asking questions, and all the FM company could tell him was “it’s showing a fault.” The...