User Manual

CAUTION:
SHOCK HAZARD
Live electrical circuits may
be exposed while performing
these procedures.
These procedures are to
be performed by qualied
technical personnel only.
ERROR DETECTION
13
WHAT TO CHECK DESCRIPTION CORRECTIVE ACTION
Has the water
tank been properly
lled?
On initial startup, an attempt to heat a
dry tank will be detected as too high a
temperature or insufcient temp rise, or
will trip the high limit.
Tank must be properly lled as
detailed on page 6.
Check hi-limit (see below)
Has hi-limit safety
thermostat tripped
off?
Brewer may have been started without
water in the tank, or the temp control
thermostat may require adjustment.
Access hi-limit by removing front
panel. Hi-limit is on the left side of
the tank. Use an insulated tool to
push the red button in until it “clicks”
and stays. Reset per above.
Check control
board and temp
probe.
Brewer will go into error mode
immediately if either the control board
or temp probe is defective.
Temp probe electrical resistance is
approximately 30KW at room temp, and
2KW at boiling. Replace temp probe if
less than 1KW.
Reset by holding the CANCEL key for
3 seconds. If lights continue to ash:
Disconnect temp probe from control
board.
a. If lights continue to ash, unplug
brewer and replace control board.
b. If lights stop ashing, unplug
brewer and replace temp probe.
Check power
board and heating
element..
Brewer will go into error mode 4
minutes after energizing the heating
element if insufcient heat rise is
detected. The heating element is
energized by an electronic power
board, and protected by the hi-limit
safety.
Heating element should receive full line
voltage (i.e. 120V, 208V or 240V).
Be sure the hi-limit safety is reset.
Reset by holding the CANCEL key for
3 seconds. If lights resume ashing
after 4 minutes:
Check the voltage across the heating
element terminals:
a. If no voltage is present, unplug
brewer and replace power board.
b. If proper voltage is present,
unplug brewer and replace tank
heating element.
Is the brew
temperature
properly adjusted?
The brewer may occasionally go into
error mode if the brew temperature is
set too high.
See page 17 for temperature
adjustment procedure.
This brewer is designed to perform a continuous internal
diagnosis, and to signal faults by ashing all the lights. In fault
mode, warmers, heating element and water ll solenoid are turned
“off”, and most keypad functions are disabled.
Error detection (all lights ashing) will occur under two conditions:
• Anytime a temperature in excess of 214ºF is detected.
• Temperature does not change by at least 2ºF within 4 minutes
of tank heater being energized (HEAT light on).
To reset the brewer after the fault has been corrected, press and
hold the CANCEL key for 3 seconds, or disconnect the brewer from
electrical power for three seconds.
641 p/n 2M-75844 1012 1040 1072 Owmers Manual