LOW SUCTION PRESSURE Vertiv — Low Suction Pressure Alarm
At a glance
- Severity
- FAULT STOP
- Domain
- PRECISION_COOLING_SYSTEM
- Reference standard
- EN 378 / F-Gas EU 517/2014
What it means
Suction pressure falls below the limit: compressor protection trips and cooling is absent or heavily reduced.
Probable causes
- Saturated CRAC air filters: insufficient flow over the evaporator
- Low refrigerant charge from a circuit leak
- Electronic expansion valve failed or faulty bulb sensor
- Dirty or iced evaporator coil
- Closed dampers or obstructed return grilles
Where to start
Measure suction pressure and superheat, check the liquid sight glass (bubbles = low charge).
Full guided diagnosis in the app
The diagnostic tree for this fault has 5 guided steps with measurements, checks and resolutions. You'll find it in DataCIQ, one of the five IndexOS apps: free, works offline.
Printable sheet + Vertiv updates
Leave your email: get the link to the printable Vertiv error-code sheet and a heads-up when we add new codes and guides.
Double opt-in, zero spam, one-click unsubscribe.
The same fault on other brands
More Vertiv codes
- HIGH HEAD PRESSURE — High Head Pressure Alarm
- HUMIDIFIER FAULT — Humidity Control Fault
- LEAK DETECTED — Water Leak / Condensate Overflow
- LOSS OF AIR FLOW — Low Airflow / High Filter ΔP
- BATTERY TEST FAILED — Replace Battery / Battery Fault
- ON BYPASS — On Bypass / Inverter Fault
- OVERLOAD SHUTDOWN — Output Overload
- OVERTEMP — Internal Overtemperature