All symptoms
Diagnosis
FLAT / UNDER-CARBONATED
Beer pours clear with little head and tastes lifeless.
3
LIKELY CAUSES — RANKED MOST COMMON FIRST
- 1
CO₂ PRESSURE TOO LOW
Beer slowly loses CO₂ until equilibrium with applied pressure.
Fix- Set regulator to the brewer's spec for current keg temp.
- Allow 24–48 hrs for carbonation to recover after re-pressurizing.
- 2
EMPTY / LEAKING CO₂
Tank empty or a leak in the gas line.
Fix- Soap-test all gas fittings; replace bad washers or hose clamps.
- Keep a spare full CO₂ cylinder on site.
- 3
OLD KEG / PAST FRESHNESS DATE
Beer staled and CO₂ absorbed into headspace gases.
Fix- Rotate stock FIFO; pull kegs past the brewer's freshness window.
STILL NOT FIXED?
Capture temp at the faucet, applied PSI at the regulator, and a photo of the pour. Then check the spec reference or run a full line cleaning.