Heater On (More Than 100 Volts) - Fresenius Medical Care 2008T Troubleshooting Manual

c) ENSURE [Temperature] is still less than 35.0° C.
d) Figure right, measure BETWEEN the Heater
Connector's BROWN and BLUE wires. TWO (2)
possible scenarios:
1) IF MORE THAN 100.0 volts! The heater is on!
See procedure number
2) IF LESS than 100.0 volts AC! Proceed to
page 295
, procedure number
T- 2.0.4 HEATER ON (MORE THAN 100 VOLTS)
Return NTC #2's connector to the 1
a)
"CON-NTC".
b) Call debug screen 0. Watch for six (6) minutes to ENSURE Flow Error is NEVER = 1 and a "No Water"
NEVER occurs.
c) From the Home or Heat Disinfect screen, [Temperature] should increase to:
•
IF in Dialysis Program: Between 35.0 and 39.0° C.
•
IF in Heat Disinfect: After no more than thirty (30) minutes, more than 80° C!
d) The low temperature problem may be intermittent and occurs ONLY after the machine has been
running for a while with good temperature. In this event DO NOT turn the machine off!
e) ENSURING a "No Water" alarm OR a Flow Error are NOT occurring AND there is less than 10 volts AC
at the heater, unplug NTC #2. If heater voltage returns to more than 100 volts AC replace NTC #2. If
(and ONLY if) heater voltage remains less than 10.0 volts AC, TWO (2) DC voltage measurements
isolates the entire heater circuit:
Measurement #1: Per
Measurement #2: Per
f) TWO (2) possible scenarios:
Scenario #1: IF (and ONLY if) BOTH measurements are GOOD: All card cage signals are okay.
There is an intermittent problem with the Triac or the Power Control Board in the power
supply.
Scenario #2: IF a BAD signal is measured: TWO (2) possibilities: If (and ONLY if) the pin 6
measurement is less than 9.6 volts DC see procedure number
T5 measurement is more than 2.0 volts DC see procedure number
T- 2.0.4 (page 284).
T- 2.6.0.
st
distribution board position from the left,
Figure 43 (page 281) at x2,
Figure 44 (page 282), at
2008T Troubleshooting Guide
P/N 490292 Rev. A
pin 6
. Good = more than 9.6 volts DC.
T5's TOP
pin. Good = less than 2.0 volts DC.
T- 2.2.0 (page 292). If the
T- 2.0.5 (page 285).
Page 284