Fresenius Medical Care 2008K Troubleshooting Manual page 96

T- 1.0.4 CHECK HEATER WIRING / RESISTANCE
IMPORTANT!
a) Turn the machine OFF! CAUTION! Electrocution hazard if the machine is not
off!
b) Referring to the Figure (right), at the distribution board's
heater connector (two checks):
1. Right to left, BOTTOM wire colors should be: Old style
heaters: Brown, Blue, and Green; New style heaters: Black,
White and Green.
2. 'Yank' on all six wires to assure they are securely attached. If
the connector or wires show damage this may be the
problem!
c) Touch the ohm meter leads together and subtract the resistance
) reading from ALL subsequent resistance readings!
d) Measure resistance between the: Old style heaters: BLUE and BROWN
wires; New style heaters: BLACK and WHITE wires. Is the meter's numeric
AND units display indicating between 10 and 12.5
Yes See procedure number
No Replace the heater (see
T- 1.0.5 CHECK TEMPERATURE SENSORS (NTC)
a) Referring to Figure 42
connector to their individual hydraulic locations. Two checks:
1) Assure all NTC's are connected correctly. If not, this may be the problem!
2) Replace the NTC if the insulation is damaged or is extremely 'sticky' as this may be the problem!
b) See procedure number
Figure 42 – Distribution Board / Rear Hydraulic View
NOTE: If Temperature is or was 'bouncing wildly' up and down, within 0.5 seconds, but does
NEVER
exceeds 41° (in Dialysis Program), 91° (in Heat Disinfect) this may indicate a torn
balancing chamber diaphragm.
T- 1.0.5 (page 94).
Figure 6, page 13).
(page 94), CAREFULLY trace the cables from each NTC distribution board
T- 1.0.6 (page 95).
Fresenius 2008K Troubleshooting Guide
P/N 507298 Rev. B (Draft 1)
Section 4 – Temperature Problems
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Page 94