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Stuck Check Ball- Remove coupler from the keg. Using something thin (dial thermometer works great) poke the check ball located in the probe of the coupler and make sure it's not stuck. Pro tip - point the coupler away from face when performing this task. Access the check ball from the bottom of the couple.
Untapped- Sounds silly but make sure the keg is tapped. Lines in the cooler can get mixed up. Untap every line and re-tap one at a time and confirm nothing is mixed up.
Gas out or shut off – Generally this will cause the beer to flow slowly or eventually not at all. Remove the coupler from the keg and engage the handle as if you are tapping it. You should hear gas coming out of the coupler. Check you have gas in the co2 cylinder and nitrogen cylinder if on a blender. If you think you may have a damaged regulator you can remove it from the gas cylinder and slowly open the wheel valve on the cylinder. You will hear gas and it should be loud. Confirm all ball valves (toggle levers) are parallel with the gas lines. Most direct draw coolers will have a ball valve (shut off) on the regulator and often will have ball valves on air distributors inside the cooler. They get accidentally bumped in the off position often. Follow the gas line up from the coupler and confirm all ball valves are in the on position.
Empty Keg- This is a common issue. The keg is stuck to the floor or the lines are mixed up. Untap every line and tap one at a time and confirm what line beer is coming out of.
Frozen- Inspect the beer line and confirm the beer is not frozen in the line. Massage the line with a warm bar towel can expedite the process. Turn up the cooler to maintain a temp of 34-38 degrees. If the kegs have froze they may be over-carbonated.
Pinched line- Follow the entire line in the cooler and make sure it's not pinched by another keg. Check and confirm it's not pinched in the tower.
Gas But No Beer- If the keg is not empty and the lines are not mixed up you may have a missing probe washer. Untap the keg and inspect the probe for the washer. Note - not all couplers have a probe washer. Look at another coupler from the same manufacture to confirm whether it should have a washer on the probe.
Missing Check Ball Retainer - Not a common issue. If there is a Check Ball and not a Retainer Clip the Check Ball can restrict flow of the beer. Install a Check Ball Retainer.
