Fresenius Medical Care 2008K Troubleshooting Manual page 105

f) Release the switches but do NOT shut the door. The "Cover is Open" message presents but Heat
Disinfect Program continues.
g) CAREFULLY watch the external meter for up to 35 minutes. If (and ONLY if) using a NEO-1*
greater than 71° C = greater than 90° C. Other meters read directly. Does the meter's reading
EVER reach 90° C or greater?
Yes Replace NTC #2 (see
No Replace NTC #3 (see
* The NEO-1 is not linear at high temperatures! If possible, do NOT use a NEO-1 for this check!
T- 1.7.0 CHECK HEATER VOLTAGE
a) ASSURE the HEATER switch is ON (rocker switch pushed into "1" or "ON")!
b) Referring to the Figure (right), unplug the connector from the
st
1
distribution board position from the left (labeled "CON-
NTC"). This is temperature control NTC #2 and NOW the
heater should be on fully.
c) Using a flashlight, CAREFULLY check inside the vacant "CON-
NTC" position for 'white' corrosion or damaged male pins that
may cause false signals.
d) CAUTION! 120 Volts AC! Referring to the Figure (right),
measure AC voltage (
connector, between the: Old style heaters: BROWN and
BLUE wires; New style heaters: BLACK and WHITE wires.
e) Proceed accordingly (two scenarios):
1. Greater than 90 volts AC: See procedure number
(page 103).
2. Less than 10 volts AC: If sure the meter is set to measure
~ V
AC voltage (
number T- 2.0.0
T- 1.8.0 CHECK NTC #2
a) CAREFULLY return NTC #2 to the
b) Measure AC voltage (
AC now?
Yes See procedure number
No Replace NTC #2 (see
121).
T- 1.9.0 CHECK TEMPERATURE DISPLAY
From the Home screen, watch Temperature IMPORTANT for up to five minutes. Does it increase to 30° C
or greater?
Yes See procedure number
No Replace NTC #3 (see
Figure 42, page 94) then see procedure number
Figure 42, page 94) then see procedure number
~ V
), at the distribution board's heater
), AND measuring correctly see procedure
(page 104).
st
1
distribution board position from the left (labeled "CON-NTC").
~ V
) again at the distribution board's heater connector. Is it greater than 90 volts
T- 1.9.0
Figure 42, page 94) then see procedure number
T- 7.0.0 (page 121).
Figure 42, page 94) then see procedure number
Fresenius 2008K Troubleshooting Guide
P/N 507298 Rev. B (Draft 1)
T- 1.8.0
(page 103).
Section 4 – Temperature Problems
T- 7.0.0 (page 121).
T- 7.0.0 (page 121).
T- 7.0.0 (page
T- 7.0.0 (page 121).
Page 103