Fetco CBS-51H10 User Manual page 20

Brewing Problem
Spray head / brew basket drips either
side or both
MAJOR
Brewer won't stop brewing
(not same as high brew levels)
Coffee tastes too strong
Temperature Problem (brewer
only)
See also LUXUS 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.)
Brew water is cold / not hot enough,
ready light is ON.
Slow to recover temperature
(Ready light takes along time to come
back on after brewing.)
Boiling
Possible Cause
Cracked dispense tube/s
(This problem starts out minor but
gets steadily worse)
Fill valve not sealing
(Will drip even with power off.)
Dispense tube cracked
Mechanical binding
(brew handle stays down / brew light
turns off at normal time)
Water pressure over 75psi
Dispense tube drive screw off. A
2.5" screw that connects the handle
to the dispense tube at the brass
sprayhead tower.
(handle returns up and brew lamp
turns off but brewing continues)
Water level probe bad or encrusted
with lime.
(causes brewer to continue filling hot
water tank which will overflow into
the brew baskets)
Bad liquid level control board
Bad or stuck fill valve
Incorrect dosage
Short brew levels
Possible Cause
No power to brewer.
Defective liquid level control board.
(No power to thermostat).
Bad connections on mercury relay.
(No power to heaters).
Defective mercury relay.
(No power to heaters).
Bad heating element/s.
Bad Thermostat
(the thermostat believes that it is at
set temperature)
Low brew temperature setting on
thermostat
Brewers with more than one heater
can have just one fail
Hot water tank limed up
Thermostat set too high for altitude
(Denver etc.)
Defective thermostat
20
Solution
-Replace both dispense tubes even if other side is not
dripping
-See next section - "Brewer won't stop brewing", "Bad or
stuck fill valve".
-See "sprayhead drips MAJOR" above
-Re-align the brew handle / brass sprayhead tower / and
dispense tube into a straight line by moving brass tower
-Place a water pressure regulator on the line and reduce to
20-75 psi
-Ensure that the drive screw is straight (can be straightened
by hand while still in the brew handle) and reconnect to the
dispense tube. The flange that the drive screw engages
MUST be held flat against the brass sprayhead tower,
without being able to back out.
-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)
-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.
-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)
-Measure and confirm the correct amount of coffee required
-See "Short brew levels", above.
Solution
-Make sure power switch is on.
-Reset machine circuit breaker.
-Check power connection. (plug or hard wire connection).
-Check building circuit breaker. (Always reset breaker by
switching off, then on.)
-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.
-Check relay for burned or loose connections. Replace
with high temperature connectors if necessary.
-Check input and output voltages on relay. 120 volts on
blue wire (input) but no voltage out to heaters indicates a
bad relay.
-Check amperage draw on heater wires. 0 amps = bad
heater.
-Replace the thermostat and or thermal probe. It's not
possible to trouble shoot the probe.
-See "Low brew temperature" under "Weak Coffee"
section.
-Check amperage draw on heater wires. 0 amps = bad
heater.
-Remove access cover to the hot water tank and inspect
for lime. Remove the brewer for shop de-liming if build up
is thick.
-Reduce temperature setting to 3 degrees below boiling at
your altitude
-Replace the thermostat and or thermal probe. It's not
possible to trouble shoot the probe.