Fetco CBS-31A User Manual - page 15
15
Brewing Problem
Possible Cause
Solution
Brewer won’t stop brewing
(not the same as high brew levels)
Water pressure over 75psi
-Place a water pressure regulator on the line and reduce to
20-75 psi
Water level probe bad or
encrusted with lime.
(causes brewer to continue filling
hot water tank which will overflow
into the brew baskets)
-Clean lime build up on the probe tip
and/or tank wall. (Holding the probe wire (green) from the
probe end to the body of the brewer should stop the fill if
the probe is bad but the liquid level board is good)
Bad liquid level control board
-Replace the LLC board if grounding the probe end of the
(green) probe wire to the body of brewer does not remove
the voltage at the fill terminal on the LLC board.
Bad or stuck fill valve
-Rebuild or replace the fill valve if no voltage is on the coil
(it is not magnetic) and it still passes water to the tank.
(Disconnect the outlet side to see if it leaks water to the
tank)
Reverse osmosis water system.
(Mineral content is too low for
liquid level control board to
operate properly.)
-Call FETCO Service Department to discuss.
(800) 338-2699.
Coffee tastes too strong
Incorrect dosage
-Measure and confirm the correct amount of coffee
required
Short brew levels
-See “Short brew levels”, above.
Temperature Problem (brewer only)
Possible Cause
Solution
See also dispenser problems
Brew water is cold / not hot enough,
ready light is OFF.
(Before proceeding, make sure water
tank refills when water is dispensed.
The brewer will not heat unless the
tank is full.)
No power to brewer.
-Make sure power switch is on
-Check power connection. (plug or hard wire connection)
-Check the wall circuit breaker / reset
-Reset the circuit breaker, located on the back of the
brewer. Press and release the white button.
Defective liquid level control
board.
(No power to thermostat).
-With power on, and water tank full, check LLC board for
120 volts on brown wire and neutral. Replace LLC board
if there is no voltage.
Bad connections on mercury relay.
(No power to heaters).
-Check relay for burned or loose connections. Replace
with high temperature connectors if necessary.
Defective mercury relay.
(No power to heaters).
-Check input and output voltages on relay. 120 volts on
blue wire (input) but no voltage out to heaters indicates a
bad relay.
Bad heating element/s.
-Check amperage draw on heater wires. 0 amps = bad
heater.
Brew water is cold / not hot enough,
ready light is ON.
Bad Thermostat
(the thermostat believes that it is
at set temperature)
-Replace the thermostat and or thermal probe. It’s not
possible to trouble shoot the probe.
Low brew temperature setting on
thermostat
-See “Low brew temperature” under “Weak Coffee”
section.
Slow to recover temperature
Brewers with more than one
heater can have just one fail.
(CBS-32 - 120/220 volts only)
-Check amperage draw on heater wires. 0 amps = bad
heater.
(Ready light takes a long time to come
back on after brewing.)
Hot water tank limed up
-Remove access cover to the hot water tank and inspect
for lime. Remove the brewer for shop de-liming if build up
is thick.
Boiling and Steams
Thermostat set too high for altitude
(Denver etc.)
-Reduce temperature setting to 3 degrees below boiling at
your altitude
Defective thermostat
-Replace the thermostat and or thermal probe. It’s not
possible to trouble shoot the probe.
Dispenser Problem
Possible Cause
Solution
Coffee not hot enough
Attempting to hold coffee
too long.
-Review discard times
Using 1/2 batch on regular
basis
-Encourage full batch use except at end of day or shift. Explore the
need for smaller dispensers
Parts related problems
-Contact dispenser manufacturer:
Zojirushi - (800) 733-6270 / Techni-Brew - (800) 545-4077