Drain System - Haier GE GDF450P R0 Series Technical Service Manual

Drain System

Operation
Drain water will back flush the fine filter through
the coarse filter, allowing food particles to settle
through the floor plate and into the drain pump.
It may be normal for the drain pump to start and
stop several times during a drain cycle if the
pressure sensor does not detect a drain. The
drain pump will run with the door open.
Drain Components
The drain pump is located on the left side of the
sump assembly and uses a twist lock connection
to the sump. The high drain loop is connected
to the drain pump outlet and secured to the side
of the tub with molded channels in the tub. The
drain hose is connected to the drain loop and
to the house drain system. Installation requires
the drain hose to provide for a second high drain
loop.
• Inside the high drain loop is a check valve
preventing drain water from reentering the
dishwasher.
Drain Pump
Check Valve
Drain Pump Diagnosing
The drain motor fuse is located on the main
control board. The fuse is not removable. Test
continuity between each fuse by touching the
touch pads TP503 and TP504. The machine
control board has a conformal coating (clear
coat). Press hard to break this coating. If an
open fuse is found, replace the machine control
and drain pump. If the fuse has continuity, check
for 120 VAC from J504-1 (dark blue) to J504-2
(yellow) and if voltage is good, replace the drain
pump.
TP503
J504-1
Failure to Drain Symptoms
• F56 fault code
• Water left in tub
• Dishwasher not completing cycle
• Dishwasher will not fill
• Clean indicator LED not coming on
• Detergent cup not opening
• User interface turning off.
Failure to Drain Diagnosing
1. Check to see if dishwasher has a failure
to drain symptom.
2. Check air gap and disposer (in the drain
pump) for clogging.
3. Verify the drain pump electrical connection
to pump, main board, and inverter board
(on some models) are good. Also, verify
continuity check on harness.
4. Verify high drain loop is attached to side of
tub.
5. Validate the home plumbing is not clogged.
• Time how long it takes the dishwasher
to drain while hooked up to the home
plumbing. It should take less than 40
seconds. If it takes longer than 40
seconds, unhook the drain hose and drain
the dishwasher into a bucket.
1. The drain should take less than 25
seconds to drain into a bucket. If the
dishwasher drains properly into a
bucket, then the home plumbing likely
has a clog and consumer should call a
plumbing service.
2. If the dishwasher takes longer than 25
seconds to drain, verify the drain hose
check valve is working properly. If drain
hose check valve is good, replace the
drain pump and if drain hose check
valve is bad/clogged, replace the drain
hose.
TP504
– 46 –
Yellow
Dark Blue
Drain Pump
J504-2