Midmark M9 - Page 25

SECTION II
TESTING AND TROUBLESHOOTING
© Midmark Corporation 2002 SF-1803 Page 2-13 Printed in U.S.A.
Code C570.
(Error Type: FATAL )
Note: When a Code ends in
“0” it means unit had a sup-
ply power interruption.
The operator could have
unplugged the unit when a
previous Code was dis-
played.
Always go to Service Diag-
nostics and check previous 5
codes that are displayed.
C570: POWER UP MODE
STEAM TEMP OVERLIM
UNPLUG / RE-PLUG UNIT
Steam temperature
exceeds 284°F (140°C)
during POWER UP mode.
May be due to a malfunc-
tion that occurred previ-
ously to Code displayed.
Go to Service Diagnos-
tics and check previous 5
displayed codes.
Refer to Code Numbers in
Troubleshooting Guide to
determine correction.
Steam Temperature
Sensor (RTD) malfunc-
tioning.
Remove plug connector
at J12 on P.C. Board and
check resistance value
(ohms) of RTD between
white and red leads.
Resistance values
should be between the
following:
75°F (23°C) = 1090
ohms.
545°F (285°C) = 2066
ohms.
Above values +/- 10
Ohms
If Steam Temperature probe
shows open or values outside
resistance ranges replace
probe (Refer to para 4.10).
Main P.C. Board Mal-
functioning.
Check for 5.0 VDC
between TP2 & TP4.
Remove plug connector
at J12 on P.C. Board
and check voltage on
pins 1 & 2.
Voltage should be apprx.
4.5 VDC at all times with
unit plugged in. Also, run
Service Diagnostics
If voltage is not present or Ser-
vice Diagnostics reveals a
problem replace P.C. Board
(Refer to para 4.13).
Code
C571 SELECT
Code C572 FILL
(Error Type: FATAL )
(Refer to column on left for
codes and description)
C571: SELECT MODE
STEAM TEMP OVERLIM
UNPLUG / RE-PLUG UNIT
Steam temperature
exceeds 284°F (140°C)
during specific mode.
Steam Temperature
Sensor (RTD) malfunc-
tioning.
Remove plug connector
at J12 on P.C. Board and
check resistance value
(ohms) of RTD between
white and red leads.
Resistance values
should be between the
following:
75°F (23°C) = 1090
ohms.
545°F (285°C) = 2066
ohms.
Above values +/- 10
Ohms
If Steam Temperature probe
shows open or values outside
resistance ranges replace
probe (Refer to para 4.10).
Main P.C. Board Mal-
functioning.
Check for 5.0 VDC
between TP2 & TP4.
Remove plug connector
at J12 on P.C. Board
and check voltage on
pins 1 & 2.
Voltage should be apprx.
4.5 VDC at all times with
unit plugged in. Also, run
Service Diagnostics
If voltage is not present or Ser-
vice Diagnostics reveals a
problem replace P.C. Board
(Refer to para 4.13).
Code
C573.
(Error Type: FATAL )
C573: HEATUP MODE
STEAM TEMP OVERLIM
ITEMS NOT STERILE
UNPLUG / RE-PLUG UNIT
Steam temperature
exceeds 284°F (140°C)
during HEAT UP mode.
Water ran out of cham-
ber thru Vent or Fill Valve
resulting in an overheat
condition.
Check condition of Vent
and Fill Valves to assure
they are not leaking thru
valve.
Replace malfunctioning valve
if required.
(Refer to para 4.18).
Table 2-3. Troubleshooting Guide
Problem Display / Symptom Probable Cause Check Correction
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