Test #9: Drain System - Whirlpool WED99HEDW0 Technical Education

TESTING
WARNING
Electrical Shock Hazard
Disconnect power before servicing.
Replace all parts and panels before operating.
Failure to do so can result in death or
electrical shock.

TEST #9: Drain System

Theory of Operation: The Drain Pump runs for 30 seconds
every 5 minutes of cycle operation regardless of float switch
input.
The Reed Float Switch is an open/closed switch. When the
sump is empty, the switch is in its lower position and in a
normally closed state (continuity/conducting).
When the Reed Float Switch 'almost' reaches its top position,
it changes state from closed to open (non-conducting). At this
point, the open state signals the CCU to run the Drain Pump an
additional 30 seconds to drain water from the sump.
The Reed Float Switch should then return to a closed state and
resume normal operation. If the Float Switch remains in the
upper position (open state), the dryer generates an F9E1 Error
Code (Drain System Error) and stops dryer operation.
A drain system failure (F9E1 Error Code) may be a malfunction
of either the float switch (sticking up, not changing state,
connections, etc.) or the drain pump (not draining, clogged or
pinched drain hose, connections, etc.). Each must be checked
and tested.
Float Switch Status
Not Conducting = Water Level Full
Conducting = Water Level Not Full
DRAIN PUMP / FLOAT SWITCH STRIP CIRCUIT
DRAIN PUMP / FLOAT SWITCH
L1
OR
BK
BU
6-20 HybridCare™ Dryer with Heat Pump Technology
n
For Service Technician Use Only
DRAIN PUMP
76-94 W
P
OR OR
REED FLOAT SWITCH
W W
This test is performed when the Float Switch remains in the
upper position (open state) and the dryer generates an F9E1
error code.
NOTE: The Drain Pump and Float Switch must be replaced as
part of the Drain Hose & Bracket Assembly.
NOTE: Refer to strip circuit below to diagnose the drain pump
and float switch.
1. If there is water beneath the front of the dryer, verify that
the dryer is level and the drain hose is securely fastened
to the drain port.
2. Verify that the drain hose (bottom center of back of dryer)
is not pinched, kinked, plugged, or otherwise restricted.
3. Unplug dryer or disconnect power.
4. Remove top panel to access the machine electronics.
5. Verify that the orange wire coming from the drain pump
is connected to the CCU, P8-1. Refer to the strip circuit
below.
6. Verify that the blue wire coming from the reed float
switch is connected to the CCU, P8-5. Refer to the strip
circuit below.
7. Access the Drain System cover by performing the
procedures on page 4-13.
¾ Check that the drain hose, drain harness and float
harness are connected to the drain system cover (see
Figure 1).
Float
Connector
Figure 1 - Drain Pump & Float Switch
8. If everything is hooked up and the drain pump still does
not drain water from the sump. Replace the "Drain Hose
& Bracket Assembly" and retest.
9. If the preceding steps did not correct the problem, replace
the CCU.
CYCLE CONTROL UNIT
OR
P8-1
DRAIN PUMP
RELAY
BU
P8-5
Drain Pump
Float Switch
Pump
Connector
W
P8-3
N
W