When the office coffee suddenly tastes bitter, sour or weak, the machine is rarely broken. In most cases the cause is one of five things: stale or wrongly stored beans, a grind setting that has drifted, a brew group or milk system that needs cleaning, a water filter that is overdue, or scale building up inside the machine. Most of these have a simple fix, and staff can check the first few themselves in under ten minutes. Panica Coffee services commercial superautomatic coffee machines across Melbourne from our workshop in Caulfield South, and this guide sets out what each taste usually means, what your team can safely check and when it is time to call a technician.
What Does Each Taste Problem Usually Mean?
Each taste points to a different cause, so start by naming the problem clearly. Ask two or three regular coffee drinkers to describe it, because one person’s “bitter” is often another person’s “burnt”.
| What the coffee tastes like | Most likely causes | First check |
|---|---|---|
| Bitter, harsh or burnt | Grind too fine, dirty brew group, very dark roast, scale | Run the cleaning cycle and check when the brew group was last cleaned |
| Sour or sharp | Grind too coarse, water not hot enough, very fresh change of beans | Check whether the beans or grind setting changed recently |
| Weak or watery | Grind too coarse, low dose, drink size set too large, nearly empty hopper | Check the hopper and the drink settings on the menu |
| Flat, stale or cardboard | Old beans, beans left open in the hopper, water filter overdue | Check the roast date and the filter change date |
| Off or sour milky drinks only | Milk system not rinsed, milk too warm, old milk | Run the milk rinse and check the milk temperature |
Why Does Office Coffee Suddenly Taste Bitter?
Bitter office coffee usually means the coffee is over extracted or the brew group is dirty. Over extraction happens when water stays in contact with the ground coffee for too long, which is most often caused by a grind that is too fine. In addition, coffee oils build up on the brew group and inside the machine over time. Those old oils turn rancid and add a harsh, burnt taste to every cup.
A superautomatic coffee machine grinds the beans, tamps the coffee, brews the espresso and froths the milk automatically, so the brew group is where most of the work happens. For that reason, the cleaning tablet cycle matters. If nobody has run it this week, run it before changing anything else.
Why Does the Coffee Taste Sour or Weak?
Sour or weak coffee usually means the coffee is under extracted. The water passes through the ground coffee too quickly to pull out the full flavour, which most often happens when the grind is too coarse or the dose is too small. A change of beans can cause it too, because a new blend or a different roast level often needs a slightly different grind setting.
Weak coffee can also have a simple explanation. For example, someone may have changed a drink size on the menu, or the hopper may be nearly empty so the grinder delivers less coffee per cup. Check those two things first, because neither needs a technician.
What Can Your Team Safely Check?
Staff can work through these checks without opening the machine or changing internal settings:
- Check the beans. Look at the roast date on the bag and how long the open bag has been sitting out. Our guide to storing coffee beans in the office explains how to keep them fresh.
- Run the cleaning cycle. Run the brew group cleaning tablet cycle and the milk system clean, following the steps in our daily coffee machine cleaning routine.
- Empty and wash the grounds drawer and drip tray. A full grounds drawer can affect how the machine doses and brews.
- Check the water filter date. If the filter is overdue, the water may be carrying more taste and minerals into the cup.
- Check the drink settings. Make sure nobody has changed the strength or cup size on the drinks you use most.
- Taste a plain espresso. If a short black tastes fine but milky drinks do not, the problem is the milk side rather than the coffee.
What Should Staff Not Try to Fix?
Staff should not open panels, adjust the brewing temperature or change service settings on a commercial superautomatic coffee machine. These adjustments affect how the machine heats and pressurises water, and a wrong setting can damage parts. Descaling inside the machine is also a technician job on most commercial models. Our guide to descaling a coffee machine safely explains why.
Grind changes sit in between. Some offices are comfortable making a small grind adjustment if the manual allows it. However, if you are not sure, it is better to ask your supplier than to keep turning the dial, because every change takes a few coffees to show its full effect.
How Do Water and Scale Affect the Taste?
Water makes up almost all of a cup of coffee, so its quality shows up in the taste. A water filter reduces chlorine taste and the minerals that form scale inside the machine. When scale builds up, it can stop the machine from heating water properly, which can make the coffee taste sour or flat. Our guide to water filtration for commercial coffee machines explains how filter life is worked out.
When Should You Call a Technician?
Call a technician when the taste stays wrong after a full clean, fresh beans and a check of the drink settings. Call straight away if the coffee tastes wrong and the machine also shows an error message, runs slowly, leaks, makes new noises or delivers coffee that is not hot. These signs point to a fault inside the machine rather than a cleaning or bean problem. Our guide to common commercial coffee machine faults lists what the most frequent problems mean.
How Does Panica Coffee Help?
On a Panica Coffee office coffee machine rental, the service plan includes servicing, so a technician can check the grind, brewing and water side when the taste is not right. Panica Coffee responds within 4 to 24 hours for sites within 30 km of Caulfield South, and within 24 to 48 hours further out. If the beans are the issue, Panica Coffee also supplies six coffee bean blends in 1 kg bags, from smooth everyday blends to bolder espresso blends.
Need Help With Your Coffee Machine?
Tell Panica Coffee which machine you have and how the coffee tastes, and we can help you work out whether it needs a clean, a grind adjustment, different beans or a service visit. Call 1300 529 505 or use the form below.
Frequently Asked Questions
Why does my office coffee taste burnt?
Burnt tasting office coffee is usually caused by a dirty brew group, a grind that is too fine or a very dark roast. Run the cleaning tablet cycle first. If the taste stays after cleaning, ask your supplier to check the grind setting.
Why does the coffee taste fine black but bad with milk?
When black coffee tastes fine but milky drinks do not, the milk system is the likely cause. Run the milk rinse, wash the milk container, use fresh cold milk and run a milk system clean.
Can new beans make office coffee taste sour?
Yes, new beans can make office coffee taste sour for a while. A different blend or roast level often needs a small grind adjustment, so tell your supplier when you change beans.
How often should the brew group be cleaned?
Most commercial superautomatic coffee machines need the cleaning tablet cycle at least weekly, and busy machines may prompt for it more often. Follow the machine’s own cleaning prompts and your supplier’s schedule.
Does a water filter change the taste of coffee?
Yes, a water filter can change the taste of coffee. A filter that is working reduces chlorine taste and scale, while an overdue filter lets more of both through. Change the filter when it is due.
Still Not Happy With the Taste?
If the coffee still tastes wrong after a clean and fresh beans, contact Panica Coffee and we will help you find the cause.