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Error Messages:
Error
Description
Number
tHU/ tHL
Thermistor warning –
immediately upon detection the
machine will beep twice and
show the warning message for
a minute as well as turn on the
right most upper dot on the
display. This dot will stay on to
signify there is a thermistor out.
Also upon power up the
machine will beep twice and
show the warning message for
a short period of time and turn
on the high dot if the warning
conditions are present
Er3
Heater Run Error
Er4
Tank Fill Error
Er5
Comm Error
Er7
Open Motor Circuit - The motor
errors (Er7 and Er8) do not
cause a system error and will
not shut down the machine.
Immediately upon detection the
machine will beep twice and
show the error message. Every
time the key is pressed to
activate a auger motor it clears
the error and allow another
attempt to be made. If this error
occurs the dump valve still will
release water.
Note: Turn machine Off then back On to Clear Error Messages
NEWCO Enterprises
Bistro 1
Section 3
Service section
Cause
Resistance extremely high from
upper or lower thermistor will
cause or the resistance extremely
low from upper or lower
thermistor will cause a tHU or tHL
warning for the thermistor that
sees the condition and causes
the control board to switch from
watching the lower to the upper
thermistor. If both the upper and
lower resisters fail then we flag a
thermistor ErC error
Water did not heat within timeout
period. Timeout period is 120
seconds which is reloaded
whenever the heater is off or the
fill valve is on
Water did not reach probe in
timeout period of 2 minutes for
initial fill and 20 seconds minute
during normal operation. The 2
minute fill time is reloaded if no
key is pressed within 24 hours
Serial communication error
to/from non-volatile memory
(EEPROM).
Open motor circuit, Auger
Phone: 1.800.325.7867 Fax: 1.636.925.0029
- 8 -
What to Check
This warns you that 1
thermistor has failed. Nothing
is required at this time as the
upper thermistor has taken
over but ordering a
replacement thermistor is
advisable
Check element for short and
proper resistance. Check
heater relay. Check for
tripped button on Hi-Limit
Thermostat.
Check valve function and flow
rate. Replace valve or
increase flow rate. Check
probes for excess scale.
Hold down the enter key to
enter Machine Set up mode
pressing the enter key to
cycle through all options then
exit mode. This resets all the
defaults. If the error still
occurs then replace main
board.
Retry Auger if the error still
occurs then check
harness/motor continuity.
Replace if defective.
12.09.10
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