Draft System Checklist: Temperature, Pressure, and Cleaning Intervals That Matter
When a draft pour is not right, the problem is usually one of three things: the beer pours flat, it pours too foamy, or it tastes off. Each symptom points to a specific set of causes. By following a simple diagnostic flow, bars and restaurants can find the root issue faster, reduce waste, and get back to clean, consistent pours.
This guide walks you through a step-by-step way to troubleshoot common draft problems. Use it as a checklist for your team or as a starting point before calling in professional service.
Start with the basics
Before diving into complex fixes, check the fundamentals. Many draft issues come from simple oversights that are easy to correct.
Quick basics to verify:
- Is the keg cold enough from top to bottom?
- Is the CO2 tank open and connected properly?
- Is the regulator set to the correct pressure for the beer and system?
- Are the faucet and coupler clean and free of debris?
- Has the system been cleaned within the recommended interval?
If any of these are off, correct them first and test a pour.
If the beer pours flat
Flat beer usually means the beer is losing carbonation somewhere between the keg and the glass. This can happen due to low pressure, temperature issues, or leaks.
Check these in order:
- CO2 pressure: Verify the regulator is set correctly for your system and beer style. Too low pressure can cause flat pours.
- Temperature: Warm beer holds less carbonation. Ensure the keg and lines are at the proper serving temperature.
- Leaks: Inspect all connections, including the coupler, regulator, and line fittings. Use soapy water to look for bubbles that indicate a leak.
- Line length and balance: If lines are too long or the system is unbalanced, carbonation can drop before the beer reaches the faucet.
- Keg age: Old or improperly stored kegs can lose carbonation over time.
If pressure, temperature, and connections are correct but the beer is still flat, the system may need rebalancing or professional inspection.
If the beer pours too foamy
Excessive foam is one of the most common draft complaints. It is often caused by temperature, pressure, or restriction issues that agitate the beer as it flows.
Check these in order:
- Temperature: Beer that is too warm will foam excessively. Ensure the keg and lines are properly chilled.
- Pressure: Too much CO2 pressure can cause over-carbonation and foam. Verify the regulator setting matches your system design.
- Restrictions: Kinks in the line, clogged faucets, or dirty couplers can create turbulence and foam. Inspect and clean as needed.
- System balance: If line length, diameter, and pressure are not balanced, foam is likely. This often requires a professional assessment.
- Pour technique: Tilting the glass and opening the faucet fully can reduce foam. Train staff on proper pour method.
If foam persists after these checks, the issue may be deeper in the system, such as glycol problems in long-draw setups or hidden restrictions.
If the beer tastes off
Off-flavors are often the most serious sign. They can indicate contamination, dirty lines, or equipment issues that affect both taste and safety.
Check these in order:
- Line cleanliness: Dirty beer lines are the most common cause of sour, stale, or off-tasting beer. Verify the last cleaning date and schedule a clean if overdue.
- Faucet and coupler hygiene: Buildup in these areas can taint flavor. Remove and clean both components thoroughly.
- Old beer in lines: If a tap has not been used in a while, flush it before serving. Stale beer left in lines can spoil the taste.
- Chemical residue: If lines were recently cleaned, ensure they were rinsed properly. Residual cleaner can create chemical or soapy flavors.
- Equipment wear: Worn seals, gaskets, or plastic parts can harbor bacteria and affect taste. Replace parts as needed.
If off-flavors continue after cleaning and flushing, the system may need a deep clean, acid wash, or professional service to check for biofilm or hidden contamination.
Use a simple diagnostic flow
To make troubleshooting faster, follow this order:
- Check temperature first. Most draft problems start with improper cooling.
- Verify CO2 pressure and connections. Incorrect pressure or leaks cause flat or foamy pours.
- Inspect faucets, couplers, and lines for dirt, debris, or damage.
- Confirm the system was cleaned on schedule and rinsed properly.
- Test pour technique and glassware. Staff training can solve many foam issues.
- If problems persist, call a professional to assess system balance, glycol function, or hidden issues.
This flow helps you eliminate the most common causes before moving to complex fixes.
When to call a professional
Some draft problems require specialized knowledge or equipment. If basic checks do not resolve the issue, it is time to bring in expert service.
Call a professional if:
- Off-flavors persist after thorough cleaning and flushing.
- Foam or flat pours continue despite correct temperature and pressure.
- You suspect system imbalance or glycol issues in long-draw setups.
- There are visible leaks you cannot locate or fix.
- The system has not been serviced in a long time.
Professional service can identify hidden problems, rebalance the system, and perform deep cleaning that restores pour quality.
Prevent problems with routine care
The best way to avoid draft issues is consistent maintenance. A well-maintained system pours better, wastes less beer, and keeps customers happy.
Routine care should include:
- Cleaning beer lines every 14 days at minimum.
- Cleaning faucets and couplers on the same schedule.
- Checking temperature and pressure regularly.
- Inspecting lines and fittings for wear or damage.
- Keeping a log of cleaning and service dates.
When maintenance is routine, small issues are caught before they become big problems.
Flat, foamy, or off-tasting beer does not have to mean lost revenue or unhappy customers. By following a simple diagnostic flow, you can identify and fix most draft problems quickly.
Start with temperature and pressure, move to cleaning and inspection, and call in professional service when needed. Consistent care and a clear troubleshooting process keep your draft system pouring at its best.
At Brewskis, we help bars and restaurants diagnose and resolve draft issues fast. From cleaning and balancing to full system service, our team ensures every pour meets quality standards.

AUTHOR:
Brewskis Beverage Service
Brewskis Beverage is a draft beer service company that specializes in draft system repair, installation, and custom beer tower design.
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