Appliance Desk 4000, Service Manual

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be about 1KΩ, if not, the valve is defective, please replace a new one.
How To Replace A New Valve?

Power off and unplug the unit.

Disconnect the inlet hose on the bad valve.

Remove two screws and washers on the rear side of work top. Lift the work top up a little by
holding its rear side, and then push it towards the door to remove the work top.

Disconnect all the rubber hoses by removing the clamps, which hold the hoses on the valves.

Disassemble the bad valve by removing two screws and all the spacers.

Replace a new same one, and then wire it again.

Re-assemble the new valve by following the reverse steps .
4.9
The pressure switch is defective
: Disassemble the pressure switch and check for the
continuity between the terminals PS-1 & PS-2(see figure below). If it is not, please check for
there is any air leakage on the hose, which is connected with this switch. Or replace a new
pressure switch.
How To Replace A New pressure Switch?

Power off and unplug the unit.

Remove two screws and washers on the rear side of work top. Lift the work top up a little by
holding its rear side, and then push it towards the door to remove the work top.

Disassemble the metal bracket from the cabinet by unscrewing two screws and washers on the
rear side of the unit.

Disconnect the hose by removing the spring clamp.

Replace a new pressure switch, and then wire it again.
 Re-assemble the new pressure switch by following the reverse steps.
5. Unit will overfill.
The machine can’t stop to fill after the water level reaches the set value, this unit will overfill. And the error
code
E4 will be displayed on VFD.
5.1
Air leakage on the hose
: Check for the air leakage on the hoses, which are connected with
the pressure switch, and test it by re-filling water.
5.2
Inlet valve is defective
: Please replace a new inlet valve, if water fills into the tub with the
unit off.