Coffee Maker Problems

Troubleshooting Your Coffee Maker Problems Can Be Infrequent … If Your Staff Are Correctly Trained!

Most of your troubleshooting can be avoided through proper barista training. First and foremost, your espresso coffee machine is a valuable piece of equipment … so, don’t let anyone near it until he or she is correctly trained.

Having a problem with your coffee machine can have a significant effect on your profits … particularly if you own a coffee shop, relying on coffee to draw coffee lovers to your establishment.

Sometimes a coffee machine technician can’t get to you immediately … so try taking matters into your own hands and check out the following …

Coffee Maker Problems and Solutions …

PROBLEM ACTION CAUSE SOLUTION
No water flows into the
machine, pump is noisy
Switch off the machine
and check for the cause
Water supply
to machine
interrupted
Check all supply taps
are open
Water mains
failure
Check other water supply
points / faucet  are working
Damaged
water feed
pipe
Check for damaged / kinked pipe
Pressure differs from normal operating range (ie 9 Bar) Listen for noise from pump Pump by-pass
incorrectly adjusted
With a filter holder locked onto the group and the coffee residue inside, operate the pump and  adjust the pressure by –  slowly screwing the by-pass screw in or out to obtain 9 bars of pressure whilst watching the
pressure gauge.
Check static pressure of water supply is within normal range
(2 to4 bars)
Pump failure Replace with new pump
Listen to determine if electric motor for pump is running normally or if it seems to be laboring Blocked in line filter sieve Remove and clean out or replace blocked filter sieve
Auto level supplies no water to boiler – water level below minimum on sight glass Turn off machine or power to heating element The probe can’t detect level Clean or replace with new probe
Solenoid valve intake manifold doesn’t open Replace solenoid valve
Auto level control
defective
Replace level control unit
Electric connection
defective
Check and make good
Wiring broken Repair wiring
Inlet water filter sieve blocked Remove and clean or
replace sieve
Auto level continuously supplies water to boiler Switch off power to machine Probe not detecting water level Clean or replace with new probe
Shut off water supply to machine Solenoid valve
intake manifold
doesn’t close
Replace solenoid valve
Auto level control
defective
Replace level control unit
Probe in sight glass Check that it doesn’t
touch the glass
Probe disconnected Reconnect probe
No pressure in the
boiler
Heating element  defective / burned out Replace with new element
No power supply to heating element Check wiring
Defective main switch Replace
Pressure switch
defective
Replace
Safety thermostat
tripped
Reset safety switch
Water boiler pressure
correct, groups cold
Heating circuit  for group head partially defective Clean out blocked pipes
Flow rate reducer
clogged
Clean out blockage
No water flows from
brewing group
Shower clogged Clean or replace
Solenoid valve blocked / not working Clean or replace valve
No power to solenoid  valve Check connection
Solenoid valve with faulty coil Replace solenoid coil
Spray filters clogged Clean or replace
Solenoid valve open for discharge Replace solenoid valve
Filter holder / Porta-filter too far to the right and not sealing to group head Hooks worn Replace filter holder
Gaskets worn / broken Replace rubber seal / gasket
Coffee residue too wet Solenoid  valve not
discharging
Replace solenoid valve
Coffee beans too finely ground Adjust grinder to coarser grind
Coffee residues in cup Coffee too finely ground Adjust grinder to coarser setting
Pressure >9 Bar Adjust to correct pressure
Filter holes dilated Replace filter holder cup
Crema too light Pressure <9 Bar Adjust delivery pressure to 9 bar
Temperature <88oC Adjust element to cut out at 1,1 bar
Spray holes clogged Clean with blind filter or replace
Filter holes dilated Replace filter cup
Coffee bean grind too coarse Adjust  grinder to finer setting
Crema too dark Pressure >9 Bar Adjust pressure to 9 bar
Temperature >95oC Adjust element to cut out at 1,1 bar
Filter holes clogged Clean with blind filter or replace
Effervescent crema Sprays clogged Replace
Temperature >95oC Adjust
Filters clogged Replace
Grinder not grinding The motor runs. Grinding burrs in
good repair.
Lift off hopper and check direction of rotation of grinder shaft Wrong direction of rotation of drive shaft Invert power supply cables
Very fine coffee powder, no adjustment for coarser grind Grinder blades worn Replace
Coffee drips from filter holder Filter holes clogged Clean
Filter holder gasket worn or holder not secured tightly Replace gasket / tighten securely
Coffee residue surface in filter holder is pitted / not flat Spray holes are partially clogged Clean with blind filter or replace
Tamping not uniformly      distributed Tamp uniformly
Coffee-dosing grinder noisy and overheated Stop grinder Worn grinders Replace with new burrs
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