Home › Commercial Refrigeration Guide › Beer & Draft Refrigeration Guide › Beer Cave Problems and How to Fix Them
Updated October 14, 2026
Quick answer
A beer cave is a walk-in cooler with glass merchandiser doors, and most of its problems start at the doors: fogging glass from failed anti-sweat heaters, doors that do not self-close, and gaskets torn by heavy traffic. Warm beer usually follows a door problem or a dirty condensing unit.
Door problems
| Problem | Likely cause | Owner check |
|---|---|---|
| Fog or water on the glass | Anti-sweat heater off or failed, very humid store | Is the heater switch or controller on? |
| Doors stay open | Worn closer or hinge cam, unit settling | Watch the door from fully open |
| Frost around the frame | Gasket torn, frame heater failed | Dollar-bill test |
| Lights out | LED driver, wiring in the mullion | Check switch and breaker |
| Fog between panes | Glass seal failed | Door or glass replacement |
Warm beer
- Doors propped or not closing during stocking. Close them between pallets.
- Shelving and airflow. Cases stacked to the ceiling or against the evaporator stop air from reaching the doors.
- Condensing unit. Rooftop or outdoor units clog with leaves and dust; clean coils and clear space around them.
- Evaporator ice from defrost problems. See ice buildup.
Keep it running
- Check door closers and gaskets weekly in busy stores.
- Keep product behind the shelf stops so doors close fully.
- Clean the condensing unit coil at least every quarter.
- Schedule a preventive visit before summer.
Planning a new one? See beer cave planning and beer cave cost.
What the technician checks
- Door and frame anti-sweat heater circuits and controls
- Door closers, hinge cams and gaskets on every door
- Evaporator, defrost and fan operation
- Condensing unit coil, fans, pressures and refrigerant charge
- Controller set point and alarm settings
Stocking without warming the cave
- Stock from the back (the cooler side) where possible, so customer doors stay closed.
- Do not prop the walk-in door during deliveries; use a strip curtain.
- Pre-chill or stage warm cases so the cave is not pulling down a full truck at once on a hot day.
Owner checks, in order
| Step | Check | What the finding means |
|---|---|---|
| 1 | Cave temperature with a thermometer in a bottle of water | Above set point: refrigeration or doors |
| 2 | Every customer door closes by itself | No: closer, hinge or level |
| 3 | Glass fog outside vs between panes | Outside: heater or humidity. Between: seal failed |
| 4 | Frost around frames | Gasket or frame heater |
| 5 | Evaporator for ice | Defrost fault |
| 6 | Condensing unit coil | Dirty: clean or call |
Bay Area factors
Stores near the coast fight humid air at the doors; inland stores fight summer heat on rooftop condensing units. Both show up first as fogged doors and warm product near the glass.
Automatic customer doors
Automatic doors have sensors, operators and fail-safe switches. If an automatic door stays open, the cave warms quickly and frost forms on the evaporator. Report door faults to the door installer and refrigeration issues to us; we coordinate when both are involved.
Maintenance schedule
| Task | How often |
|---|---|
| Check temperature and log it | Daily |
| Check every door closes and seals | Weekly |
| Clean glass and check for fog | Daily |
| Clean condensing unit coil | At least quarterly; monthly in dusty spots |
| Professional inspection of refrigeration, heaters and doors | Twice a year, before summer and before the holidays |
What our technician does
- Measures cave and product temperature.
- Tests door and frame heaters and controls.
- Adjusts or replaces closers and gaskets.
- Checks the evaporator, defrost and condensing unit.
Regular hours are 8 AM to 5 PM, with emergency service until 9 PM.
What each finding means
| Finding | Meaning |
|---|---|
| Only product near the glass is warm | Doors, heaters or loading |
| Whole cave warm | Refrigeration |
| Warm after deliveries only | Load and door habits |
| Fog on one door | That door's heater or seal |
| Fog on all doors on humid days | Store humidity |
Shelving and airflow
Shelving that blocks the evaporator or crowds product against the glass leaves warm pockets. Leave space at the top for air to reach the doors, and keep floor stacks out of the evaporator's throw.
Energy
Door heaters and lights run continuously in most caves. LED lighting and heater controls lower operating cost, but disabling heaters to save energy usually causes fog and frost. Keeping doors closing properly saves more than any other single habit.
When to call a technician
Call if glass keeps sweating with heaters on, if doors will not self-close after adjustment, or if the cave cannot hold its set point.
Open 7 days, 8 AM to 5 PM, with emergency service until 9 PM. CA Lic. #776244.
Frequently asked questions
Why are my beer cave doors fogging?
Usually the anti-sweat heaters in the door or frame are off or failed, or store humidity is high.
What temperature should a beer cave be?
Most stores run beer caves in the mid-30s °F so packaged beer is cold at the door.
Why do beer cave doors stop closing?
Worn closers or hinge cams, or a unit that has settled out of level.
Do beer cave door heaters need to run all the time?
Many run continuously or under a controller. Turning them off to save energy usually causes fogging and frost.
Why is there frost on the beer cave ceiling?
Humid air entering through doors left open or poor seals; fix the doors first.
How often should beer cave doors be serviced?
Check them weekly and have them serviced at least twice a year.
Can you fix automatic beer cave doors?
We handle the refrigeration and heaters; door operators are serviced by the door installer. We coordinate when both are involved.
Why do my beer cave doors stick in winter?
Frame heaters may have failed, letting gaskets freeze or stick to cold frames.
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