Is your Primo water dispenser dispensing slowly or producing water with a strange aftertaste? Knowing how to drain Primo water dispenser units properly is the only way to remove hidden mineral deposits and bacteria that cause these issues.
This guide walks you through every step to safely empty, sanitize, and restart your machine without damaging internal parts. You will learn exactly which tools to use, how to access the rear drain plug, and the specific button combinations needed for a total system flush.
Power Down and Prepare the Unit Safely
Water and electricity create a dangerous combination, so you must cut power before starting any maintenance work. Always turn off all energy-saving switches and unplug the dispenser from the wall outlet immediately.
Remove the Water Source
Lift the empty 5-gallon bottle off the top for standard models or disconnect the base connection for bottom-loading units. This action stops fresh water from entering the system while you work on the internal reservoirs.
Position the Dispenser for Access
Pull the unit away from the wall to create ample workspace around the back panel. Lay down old towels on the floor to catch accidental spills and protect your flooring during the draining process.
Empty Internal Reservoirs Through Taps
Start by removing the bulk of the water stored inside the hot and cold tanks using the standard dispensing nozzles. This preliminary step reduces the volume of water you must handle later during the deep clean.
Open Hot and Cold Water Taps
Place a large pitcher or bucket under both spouts and open the taps fully until the flow stops completely. Some residual water will remain in the lines, which is normal and expected at this stage of the process.
Pro Tip: If water fails to flow, check if the internal float mechanism is stuck in the up position.
Mix and Circulate Sanitizing Solution
Even if your goal is just draining, running a sanitizing cycle every three months prevents biofilm buildup and keeps your water tasting fresh. You can use distilled white vinegar for a non-toxic clean or regular bleach for faster disinfection.
Prepare the Cleaning Mixture
Combine 2 cups of distilled white vinegar or 2 tablespoons of regular bleach with 2 gallons of hot tap water inside an empty 5-gallon bottle. Hot water helps the solution dissolve mineral scale and kill bacteria more effectively than cold water.
Fill the System with Solution
Reattach the bottle firmly to the dispenser, ensuring you push and twist slightly to seat the internal cord on bottom-load models. Plug the unit back in, turn both hot and cold switches to ON, and let the reservoirs fill with the cleaning mix.
Let the Solution Soak
Allow the solution to sit inside the internal tanks for exactly 10 minutes to break down deposits. You may notice a strong vinegar scent during this time, which indicates the solution is actively working on internal surfaces.
Warning: Never leave the cleaning solution in the unit for longer than 30 minutes as prolonged exposure can damage internal seals.
Flush and Rinse the System Thoroughly
You must remove all traces of the cleaning agent to ensure your next bottle of water is safe to drink. Proper rinsing prevents any lingering vinegar taste or bleach odor in your drinking water.
Drain the Used Cleaning Solution
Turn off the switches and unplug the dispenser before opening both taps to drain the dirty solution into a bucket. Close the taps once the flow stops to prepare the system for the fresh water rinse cycle.
Rinse With Fresh Hot Water
Rinse your 5-gallon bottle thoroughly and refill it with plain hot tap water containing no additives. Reinstall the bottle, plug the unit in, and run water through both taps until the bottle is empty to flush out residue.
Repeat Rinsing if Necessary
Smell the water coming from the taps to verify that no vinegar or bleach odor remains before using the machine. If you detect any scent, repeat the rinse cycle with a second bottle of fresh water to ensure neutrality.
Perform Deep Drain Via Back Panel
Standard tapping does not remove all water, so you must access the rear drain point for moving, storage, or repairs. This critical step removes the stagnant water sitting in the bottom reservoir that taps cannot reach.
Remove the Back Panel Cover
Ensure the unit is unplugged and locate the back panel, sometimes called the “slow cover,” on the rear of the machine. Use a Philips head screwdriver to remove the securing screws and gently take off the cover to expose the drain components.
Activate the Rear Drain Valve
Look for a green needle or a specific drain plug and cap assembly on the back of the internal tank. Carefully remove the green needle or unscrew the drain plug to open the valve and allow water to escape.
Collect Runoff and Tilt Unit
Place a 2-gallon bucket directly underneath the opening and gently tilt the unit forward to force out remaining drops. This tilting action ensures water trapped in low points of the reservoir flows out completely.
Reassemble the Drain Components
Once the unit is fully dry, reinsert the drain plug or green needle and secure the cap tightly. Replace the back panel cover and tighten the screws firmly, but avoid overtightening the plastic fittings.
Clean External Components and Float
While the internal system is empty, take time to clean accessible external parts to maintain overall hygiene. Proper care of these components prevents clogs and ensures the float mechanism functions correctly.
Wipe the Float Mechanism
Locate the float assembly near the water inlet and wipe around it with a damp, lint-free cloth. Ensure the float moves up and down freely, as debris here can cause the unit to overfill or fail to refill.
Clean Dispensing Spouts Gently
Lightly wipe the underside of the hot and cold spouts with a clean cloth to remove any external grime. Do not insert brushes or tools into the spouts, as this can scratch seals and cause permanent leaks.
Wipe Down Exterior Surfaces
Use a damp cloth to clean the cabinet, drip tray, and control panel, then dry all surfaces immediately. Avoid using abrasive cleaners that could scratch the finish or damage the plastic housing.
Common Mistake: Inserting objects into spouts or using harsh chemicals can void your warranty immediately.
Restart and Refill With Fresh Water
Now that the unit is clean, dry, and reassembled, you can restore it to normal operating condition. Following the correct restart sequence ensures the reservoirs fill properly without air locks.
Install a Fresh Water Bottle
Place a new 5-gallon Primo bottle on the unit and push down firmly while twisting slightly to seat the internal cord. This seating process prevents vibration noise and ensures a secure connection for water flow.
Power On and Test Flow
Turn both hot and cold switches to ON and allow the reservoirs to fill completely before dispensing. Dispense a small amount of water from each tap to confirm proper flow rate and temperature before regular use.
Time Estimate: The entire draining and cleaning process typically takes about 30 minutes to complete.
Execute Special Draining for Repairs
Certain situations like moving or internal repairs require evacuating water from the heating element specifically. This advanced procedure uses a specific button combination to force water out of the hot water line.
Activate Hot Water Release Mode
Press and hold the File, Set, and Child Lock buttons simultaneously while the unit is powered on. Hold these buttons until the hot water release activates and drains the heating chamber completely.
Disassemble Internal Components
Only after confirming the unit is 100% drained should you remove the pet pack, air tube, and plastic connection box. Never attempt to disassemble these parts while water remains inside to avoid electrical damage.
Troubleshoot Common Draining Issues
Even with careful work, you might encounter minor issues like lingering smells or flow problems after maintenance. Understanding these common hiccups helps you resolve them quickly without calling support.
Persistent Vinegar Smell
Cause: Incomplete rinsing of the internal lines.
Fix: Run another full cycle with hot tap water and dispense until the odor disappears completely.
Noisy Operation After Refill
Cause: The bottle cord is not seated properly in the base.
Fix: Remove the bottle and reinsert it, twisting slightly to align the internal cord correctly.
Water Will Not Flow
Check: Verify the float is not stuck and that the rear drain plug is fully closed. Also ensure the back panel is secure and the unit is plugged in.
Leak at Back Panel
Likely Cause: The drain plug or cap was not tightened sufficiently.
Action: Reopen the panel, inspect the seal, and resecure the plug without overtightening the plastic.
Follow Preventative Maintenance Tips
Consistent care extends the life of your dispenser and ensures your water always tastes clean and fresh. Adopting these habits prevents major issues and keeps your machine running efficiently for years.
Adhere to 3-Month Cleaning Schedule
Mark your calendar to clean the unit every three months to prevent mineral buildup and bacterial growth. High-usage environments like offices may require more frequent cleaning intervals.
Use Only Approved Cleaners
Stick strictly to distilled white vinegar or regular bleach to avoid damaging internal seals. Harsh chemicals or detergents can degrade plastic components and void your manufacturer warranty.
Store Properly When Not in Use
If storing the unit long-term, drain it completely via the back panel and leave taps open. Remove the water bottle and store the dispenser in a dry, upright position to prevent mold.
Frequently Asked Questions About Draining Primo Dispensers
How often should I drain and clean my Primo water dispenser?
You should perform a full drain and cleaning every 3 months to prevent bacterial buildup and mineral deposits. High-traffic areas or units noticing a taste change may need cleaning more frequently.
Can I use bleach instead of vinegar to clean my dispenser?
Yes, you can use 2 tablespoons of regular bleach as an alternative to 2 cups of distilled white vinegar. However, vinegar is generally recommended for home use as it is less toxic and easier to rinse.
Why is water still coming out after I opened the taps?
Water remains in the bottom reservoir because standard taps cannot reach it, requiring a deep drain via the back panel. You must remove the rear cover and open the drain plug or green needle to empty this section.
What tools do I need to drain the back of my Primo dispenser?
You will need a Philips head screwdriver to remove the back panel and a 2-gallon bucket to catch the runoff water. A funnel is also helpful to direct the flow and prevent spills on the floor.
How do I drain the hot water line specifically?
Press and hold the File, Set, and Child Lock buttons simultaneously while the unit is on to activate the hot water release. Allow the line to drain completely into a container before powering down.
Key Takeaways for Draining Your Primo Water Dispenser
Properly learning how to drain Primo water dispenser units protects your investment and ensures safe, great-tasting water. Remember to always unplug the unit before starting, use the back panel for a complete drain, and stick to a strict 3-month cleaning schedule.
Take action today by gathering your vinegar, bucket, and screwdriver to perform this essential maintenance task. Your dispenser will run more efficiently and provide healthier water for you and your family.
