Mr. Coffee Won't Brew? 5 Fixes That Work

Why Your Mr. Coffee Won't Brew

Mr. Coffee's own troubleshooting table lists four reasons a drip coffeemaker won't brew: it isn't getting power (unplugged or a power outage), the water reservoir is empty, the filter basket isn't inserted, or the decanter isn't placed fully on the warming plate. Two more causes catch people out: a Delay Brew that wasn't re-set (it doesn't repeat the next day), and scale that slows or stalls the brew until you run a Clean cycle.

Mr. Coffee drip makers don't show numbered error codes. The lights are all you get, so start by checking what they're doing.

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What Your Mr. Coffee Is Telling You

Which model is yours? The 12-Cup Programmable (JPX37 series) has no power switch; you press Brew Now/Off. The Simple Brew (SK series) has an On/Off switch with a light. The model number is stamped on the bottom of the machine.

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Try This First

• Push the carafe all the way onto the warming plate, with the lid on.
• Check the filter basket clicks fully into place.
• Look at the reservoir. It needs water, but not past the 12-cup MAX line.
• Press Brew Now/Off (JPX37) or turn the switch on (SK) and watch for the light.

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Fix 1: Seat the Carafe and Filter Basket (Works About 35% of the Time)

Two of the four causes in Mr. Coffee's troubleshooting table are placement problems: the basket isn't inserted, or the decanter isn't fully on the warming plate. The JPX37 manual warns that if the carafe isn't placed fully, "the water and the grounds will overflow from the filter basket".

1. Press Brew Now/Off (or switch off) and let the machine cool if it has been running.
2. Take out the filter basket and put it back so it's fully inserted.
3. Use a 10-12 cup basket-style paper filter or a permanent filter, with the paper sides flush against the basket. If a paper filter collapses, dampen it first.
4. Put the lid on the carafe and slide it all the way onto the warming plate.
5. Start the brew again.

If the basket overflowed: turn the coffeemaker off, unplug it, let it cool and wipe up. Don't set a hot carafe on a wet warming plate. Pause 'n Serve gives you up to 30 seconds to pour a cup mid-brew; longer than that and the basket overflows.

Time: 2 minutes
Cost: Free
Success Rate: About 35%
Difficulty: Easy

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Fix 2: Check Water and Power (Works About 25% of the Time)

The other two causes in the table are an empty reservoir and no power.

Water:

1. Fill the reservoir with water using the carafe's cup markings.
2. Stop at the 12-cup MAX line. If you fill past it, water flows out of the overfill hole at the back of the machine instead of brewing.

Power:

1. Make sure the plug is fully in the wall socket. The plug is polarized, so it fits one way only.
2. Don't use an outlet where the plug fits loosely or that feels warm. Try another outlet you know works.
3. JPX37: there's no power switch. Press Brew Now/Off; its light pulses while it brews. SK series: turn the On/Off switch on and look for its light.
4. After a power cut, the machine carries on with what it was doing only if power comes back within 7 seconds (JPX37) or 10 seconds (SK). After a longer outage, press Brew Now/Off again.

If no light comes on in any working outlet, go to our Mr. Coffee won't turn on guide.

Time: 2-5 minutes
Cost: Free
Success Rate: About 25%
Difficulty: Easy

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Fix 3: Re-Arm Delay Brew Every Night (Works About 15% of the Time)

If your Mr. Coffee brewed yesterday at the set time but not today, this is almost certainly why. The JPX37 manual says: "As a safety feature, your coffeemaker will NOT start again automatically the next day." You have to arm Delay Brew each night.

1. Make sure the clock shows the correct time. A flashing clock means the machine lost power, and the time needs setting again.
2. Set the Delay Brew time.
3. Press Delay Brew so the yellow Delay Brew light comes on.
4. Fill the water and coffee the night before, as usual.

Why the clock matters: if you press Brew Now/Off or Clean before setting the clock, the clock starts from 12:00 a.m., so a programmed time will be off by hours.

Our Mr. Coffee timer not working guide covers the programming steps in more detail.

Time: 2 minutes
Cost: Free
Success Rate: About 15%
Difficulty: Easy

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Fix 4: Run the Clean Cycle (Works About 15% of the Time)

Mr. Coffee's troubleshooting table has one cause for "brews slowly": the coffeemaker needs cleaning. On the JPX37, the red Clean light flashes when it's due.

1. Put an empty 10-12 cup basket filter in the basket and place the empty carafe on the warming plate.
2. Pour 4 cups (20 fl oz) of undiluted white vinegar into the reservoir, or use Mr. Coffee cleaner.
3. Press Clean. The Clean light stays on.
4. The machine brews about 3 cups slowly, then pauses for about 30 minutes. That's normal, so leave it.
5. It brews the rest, then the Clean light and the machine turn off. The whole cycle takes 45-60 minutes.
6. Discard the vinegar and run two full brew cycles of fresh water.

How often: every 80 brew cycles with soft water, every 40 with hard water, or whenever the red Clean light flashes. This is the JPX37 procedure; our Mr. Coffee descaling guide has more detail.

Time: About 1 hour 15 minutes, including the rinses
Cost: The price of a bottle of white vinegar
Success Rate: About 15%
Difficulty: Easy

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Fix 5: Contact Mr. Coffee Support (Works About 10% of the Time)

If the light comes on, the reservoir is full, everything is seated, and a Clean cycle hasn't helped, the fault is inside the machine. The manuals say plainly: "No user serviceable parts inside." Don't remove the cover.

1. Note the model number stamped on the bottom.
2. Call Mr. Coffee: 1-800-MR COFFEE (1-800-672-6333) in the US, or 1-800-667-8623 in Canada.
3. If the machine is under a year old, it's covered by the 1-year limited warranty for the original purchaser with proof of purchase. Don't return it to the store; the warranty is handled by Mr. Coffee. Repairs by anyone else void it.

About thermal fuses: repair guides for the 5-cup Mini Brew show a thermal fuse in the base that can fail over time. A thermal fuse is one-shot. It doesn't reset when the machine cools, so any online "reset" routine for it won't work. On a machine out of warranty, replacing the coffeemaker is usually the practical choice.

Time: 15 minutes
Cost: Free under warranty
Success Rate: About 10%
Difficulty: Easy

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When DIY Won't Work

Stop using it and unplug it if the cord or plug is damaged, you smell burning, or the outlet feels hot. Mr. Coffee's manuals say not to repair or splice a damaged cord.

Call Mr. Coffee if the power light works but no water moves after Fixes 1-4, or if the machine won't power on in a known-good outlet.

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Prevention

• Seat the basket and carafe fully before every brew.
• Fill to the MAX line, not past it.
• Arm Delay Brew each night, and reset the clock after any power cut.
• Run the Clean cycle every 40-80 brews, depending on your water, or when the Clean light flashes.
• Keep Pause 'n Serve under 30 seconds.
• Place the machine on a hard, flat, level surface so air can flow underneath.

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FAQ

Why won't my Mr. Coffee brew even though the light is on?

Mr. Coffee's table lists three causes besides power: the reservoir is empty, the filter basket isn't inserted, or the carafe isn't fully on the warming plate. Reseat the basket and carafe, check the water, and try again. If it only trickles, run a Clean cycle.

Why didn't my Mr. Coffee brew at the programmed time?

Delay Brew doesn't repeat. The JPX37 manual says the coffeemaker "will NOT start again automatically the next day", so you arm it every night so the yellow Delay Brew light is on. Also check the clock: after a power cut it flashes and needs setting again.

Does my Mr. Coffee have a reset button?

The Mr. Coffee manuals read for this guide don't describe a reset button or a button-combination reset. After a power outage longer than 7 seconds (JPX37) or 10 seconds (SK), the machine stops what it was doing. Press Brew Now/Off again, and set the clock.

Why does my Mr. Coffee take forever to brew?

The manual's answer for slow brewing is that the coffeemaker needs cleaning. Run the Clean cycle with 4 cups of white vinegar. It pauses for about 30 minutes partway through, which is normal. Then run two fresh-water cycles.

Why did water come out the back of my Mr. Coffee?

The reservoir was filled past the 12-cup MAX line. The JPX37 manual says the extra water flows out of the overfill hole in the back. Use the carafe markings, and stop at MAX.

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Related Mr. Coffee Guides

• Mr. Coffee Won't Turn On
• Mr. Coffee Descaling Guide
• Mr. Coffee Timer Not Working
• Mr. Coffee Leaking Water
• Mr. Coffee Slow Brewing

Sources: Mr. Coffee 12-Cup Programmable JPX37-R series user manual and Simple Brew SK series user manual (Sunbeam); iFixit Mini Brew thermal fuse guide (repair community).