Bunn Coffee Maker Won't Brew? 6 Fixes (Speed Brew, Phase Brew, My Café)

Nothing Moves Until the Lid Closes

On a Bunn Speed Brew or Velocity Brew, the water you pour in stays in the pour-in bowl until the lid is closed. A rubber stopper holds it back, and closing the lid lets it into the tank. Less than 20 oz poured in won't push coffee out either. So a Bunn that "won't brew" is most often a lid that isn't fully down, or a pour that's too small. The next most likely cause is a tank that isn't full.

That's the always-hot design at work. The new water displaces hot water already in the tank, so if the tank is short, after storage, draining or weeks switched on without use, the first pots come out short or not at all. Bunn's Phase Brew, Heat N Brew and single-cup My Café work differently, so each has its own fix below.

---

Try This First

• Close the lid all the way. On a Speed Brew or Velocity Brew, nothing reaches the tank until it does.
• Pour at least 20 oz (4 cups). Bunn's range is 20 to 50 oz per batch.
• Look into the pour-in bowl after a minute. Water still sitting there means a clogged sprayhead (Fix 3).
• Think about the last few weeks. Moved, drained, stored or unused? The tank needs refilling (Fix 2).
• Check the panel on a Phase Brew, Heat N Brew or My Café. A red light, EE:03 or a flashing light points straight to the cause (Fixes 5 and 6).

---

Which Fix You Need

---

Fix 1: Close the Lid and Pour Enough Water (Works About 30% of the Time)

The pour-in bowl has a rubber stopper. Opening the lid completely sets it, and closing the lid releases the water into the tank, where it pushes hot water out through the sprayhead. With the lid part-open, or with too little water to push anything out, the machine just waits.

Signs it's this one:

• The water is still in the bowl, and the lid isn't fully down
• You were making a small pot of fewer than 4 cups

1. Fill the carafe with at least 20 oz of cold water (the brewing chart runs from 4 cups at 20 oz to 10 cups at 50 oz).
2. Open the lid completely and pour the water in.
3. Close the lid fully.
4. Coffee should start within moments and finish in about 3 to 4 minutes.

Time: 1 minute
Cost: Free
Success Rate: About 30%
Difficulty: Easy

Worth knowing: you always get a little less coffee than the water you poured, because the grounds absorb some. That's normal.

---

Fix 2: Refill the Tank With Bunn's Setup Steps (Works About 25% of the Time)

An always-hot Bunn needs a full tank before it can brew. A new machine arrives empty, and so does one that was drained for a move, storage or freezing temperatures. One left switched on for a long time without use slowly loses water too. BUNN's answer to both "coffee doesn't come out" and "only partially brewed" is to top the tank off by repeating Initial Setup.

Signs it's this one:

• Brand-new machine, or it was drained or stored
• It was switched on but unused for weeks
• You get a partial pot, or nothing on the first try

⚠️ Warranty: BUNN warns, in capitals, not to plug the brewer in until the tank is filled. Doing it the other way round causes permanent damage and voids the warranty. Power always comes last.

1. Switch the tank off and unplug the brewer.
2. Slide the empty brew funnel into its rails, carafe underneath.
3. Fill the carafe with water and pour it in with the lid open.
4. Close the lid and wait 4 minutes while the tank fills.
5. Repeat steps 3 and 4 until water flows from the funnel. A Velocity Brew takes two full carafes to fill completely.
6. Plug in, switch the tank on, and wait 15 minutes for it to heat.

Time: About 30 minutes
Cost: Free
Success Rate: About 25%
Difficulty: Easy

---

Fix 3: Clear a Clogged Sprayhead (Works About 20% of the Time)

If water still sits in the pour-in bowl after you close the lid, BUNN's troubleshooting table names the cause: a clogged sprayhead. The water can't get out of the tank fast enough, so it can't get in either.

Signs it's this one:

• Water left standing in the bowl
• Brewing slowed down before it stopped

⚠️ Safety: the tank is full of hot water. Switch off, unplug and let it cool at least 2 hours before you touch the sprayhead.

1. Switch the tank off, unplug, and wait 2 hours.
2. Slide out the funnel and unscrew the sprayhead with your fingertips.
3. Clear each hole with a toothpick, then wash the sprayhead with dish soap and rinse it.
4. Refit it, plug in, switch on, and wait 15 minutes.

Time: About 2 hours 15 minutes, mostly cooling
Cost: Free
Success Rate: About 20%
Difficulty: Easy

The full removal and refit, for each model, is in our Bunn spray head guide.

---

Fix 4: Delime the Sprayhead Tube (Works About 10% of the Time)

Lime also builds up in the tube behind the sprayhead and in the tank. BUNN's last step for coffee that won't come out is the flexible deliming tool supplied with the brewer.

Signs it's this one:

• The pot got slower over months before it stopped
• A clean sprayhead didn't help

1. With the brewer cool and the sprayhead off (Fix 3), insert all but two inches of the deliming tool into the sprayhead tube.
2. Slide it in and out five or six times.
3. Flush with a carafe of fresh water, refit the sprayhead, and switch back on.
4. Then run BUNN's vinegar clean: 1 quart of white vinegar through, a 2-hour soak, and fresh-water rinses. The steps are in our Bunn descaling guide.

Time: About 3 hours with the vinegar soak
Cost: A few dollars for vinegar
Tools: The BUNN deliming tool for your model
Success Rate: About 10%
Difficulty: Moderate

Use the tool that came with your brewer. BUNN warns that different models take different tools, and the wrong one can damage the brewer.

---

Fix 5: Start the Cycle on a Phase Brew or Heat N Brew (Works About 10% of the Time)

These two hold water in a Top Tank and heat it for each pot, so "won't brew" usually means the cycle never started.

Signs it's this one:

• A clock display and an On/Off (Phase Brew) or Brew (HB) button
• No red light after pressing it
• EE:03 on a Heat N Brew

1. Check the brewer is plugged into a working outlet.
2. Press On/Off (Phase Brew) or Brew (HB). The red light should come on.
3. Make sure the Top Tank holds at least 4 cups (20 oz).
4. On a Heat N Brew, EE:03 means "the brewer did not detect water". Fill the Top Tank and try again.
5. If you used Delay Brew and it didn't start, set the clock. Both manuals list an unset clock among the reasons a programmed brew doesn't run.
6. If CLE (Phase Brew) or CLEAN (HB) is showing, run the clean cycle. Our Bunn error codes guide has both.

Time: 5 minutes
Cost: Free
Success Rate: About 10%
Difficulty: Easy

---

Fix 6: On a My Café, Read the Lights (Works About 5% of the Time)

The single-cup My Café MCU has its own tank and tells you what's wrong with its lights. Its manual's "water is not exiting drawer" row comes down to four checks.

Signs it's this one:

• A flashing Brew Button or Indicator Light
• The drawer isn't fully home

1. Brew Button flashing red: the internal tank needs filling. Run the manual's Initial Setup, 14 oz at a time, until the button stops flashing.
2. Indicator Light flashing red and green: the drawer isn't fully inserted. Push it in until it locks.
3. Indicator Light flashing green: add water. If the bowl is full, the water may be too pure for the probes to detect, so swap distilled water for tap or spring water.
4. Indicator Light flashing red: it's still heating. Wait for green (about 2 minutes) and press Brew again.
5. Only hot water comes out: check there's coffee or tea in the drawer.

Time: 5 minutes
Cost: Free
Success Rate: About 5%
Difficulty: Easy

---

When DIY Won't Work

Stop and call BUNN if:

• Water is collecting under the brewer
• There's a burning smell, or the breaker trips when the tank switch goes on
• The cord or plug is damaged

BUNN's manuals say to never disassemble the coffeemaker, because there are no user-serviceable parts inside. Despite what some guides say, no manual shows a float, valve or fuse you can reach.

Warranty and support: three years on a new Speed Brew, Velocity Brew, Phase Brew or Heat N Brew (glass carafe excluded). Two years on a My Café MCU. Call 1-800-352-2866 (USA) or 1-800-263-2256 (Canada) with the model and date code, which are etched on the power cord's prongs or printed on the bottom or lower back.

---

Keep It Brewing

• Leave the always-hot models switched on. BUNN designs them for it.
• Drain before storage, a move or freezing temperatures, and run Initial Setup again afterwards.
• Every 3 months: sprayhead cleaned and the vinegar clean run. Twice a month for the sprayhead in very hard water.
• Pour at least 20 oz on a Speed Brew or Velocity Brew.
• Use tap or spring water in a My Café, not distilled.

---

FAQ

Why does my new Bunn not brew the first time?

Its tank is empty. A new Speed Brew or Velocity Brew has to be filled through Initial Setup before it's plugged in. Pour carafes in, close the lid, wait 4 minutes and repeat until water flows from the funnel. The Velocity Brew needs two full carafes, then 15 minutes to heat.

Can I brew just one or two cups in a Speed Brew?

No. BUNN's range is 20 to 50 oz, so the smallest batch is 4 cups (20 oz). Less than that isn't enough to push hot water out of the tank. For single cups, BUNN's My Café is the machine built for it.

Why is there water left in the top of my Bunn?

On a Speed Brew or Velocity Brew, water sitting in the pour-in bowl after the lid is closed means the sprayhead is clogged, according to BUNN. Let the brewer cool for 2 hours, then remove and clean the sprayhead.

Does a Bunn have a float or a valve I can unstick?

None of BUNN's home manuals describes one, and all of them say there are no user-serviceable parts inside. The only things you're meant to remove are the funnel, carafe, sprayhead and top cover. If cleaning doesn't fix it, call BUNN.

---

Related Bunn Guides

• Bunn Coffee Maker Troubleshooting Guide: every Bunn symptom in one place
• Bunn Brewing Slow?: when it brews, just slowly
• Bunn Coffee Maker Won't Turn On?: when nothing powers up
• Bunn Error Codes and Lights: EE:03, CLE, CLEAN and the My Café lights

Sources: BUNN Speed Brew Owner's Manual (53883.0002, models GRX/BX/SBS/CSB1/CSB2/BTX/CSB3T); BUNN Velocity Brew 10 Cup Use & Care Manual (43097.0002D01, models NHS/GR/BX/BT/ST); BUNN Phase Brew 8 Cup Use & Care Manual (HT/HG); BUNN Heat N Brew Model HB Use & Care Manual (52774.0000a); BUNN My Café Single Cup Multi-Use Brewer Use & Care Manual (MCU, 43460.0002D).