Fresenius Medical Care 2008K Troubleshooting Manual page 69

NW- 2.0.2 CHECK PRESSURE REGULATOR #61
a) Reattach the incoming water tubing. IMPORTANT! Turn the water on.
b) Read this entire step before performing it! Check INLET WATER PRESSURE, per Preventative
Maintenance procedures, but CAREFULLY watch the gauge for three minutes. Pressure should fluctuate
between a minimum and maximum. The minimum, decreasing to 8 psi or lower, indicates marginal
incoming water (RO supply) pressure. If (and ONLY if) the minimum is remaining 8 psi or greater, the
maximum should be between 18 and 20 psi. If not, calibrate regulator #61 (see
unsuccessful a bad regulator #61 is indicated.
NOTE: Regulator #61 controls maximum pressure when valve #41 is closed, incoming water (RO
supply) flow determines minimum pressure when valve #41 is open.
NW- 3.0.0 CHECK FLOAT (#5) SIGNAL
a) Remove the clamp (the pliers).
b) Turn the water off.
c) Referring to the Figure (right), place the
from the two-resistor OLC set, into the float's distribution board
position labeled "FLOAT-SW" (3
c) This simulates a 'closed' float switch and should call for water.
d) Call debug screen 0. Referring to the Figure
(right) is valve #41's dot constant blue
indicating the valve is supposed to be open?
Yes Leaving the resistor plug in place, see procedure number
No a) ASSURE the
procedure number
b) Four possibilities: 1) Bad actuator board; 2) Bad sensor cable*; 3) Bad distribution board;
4) Bad motherboard.
* The cable can be checked for continuity. NOTE that one (1) FLOAT connection will be
checked and proceed to page 228,
CABLE.
NW- 4.0.0 CHECK FOR WATER INLET
a) Place a bucket under the vent tubing to capture possible overflow.
IMPORTANT
b) ! Turn the water on. Valve #41 should be open and allowing water into the machine. After
no more than 45 seconds is there overflow from the vent tubing?
Yes See procedure number
No See procedure number
274
resistor plug,
rd
connector from the left).
274
resistor plug is placed properly before continuing! If not repeat
NW- 3.0.0 (page 67), from part c
NW- 5.0.0 (page 68).
NW- 4.0.1 (page 68).
Fresenius 2008K Troubleshooting Guide
P/N 507298 Rev. B (Draft 1)
Section 2 – "No Water" Message
NW- 4.0.0
SECTION 17 - CHECKING THE SENSOR BOARD
Figure 30, page 66). If
(page 67).
Page 67