Haier AW07EH2VHA, Service Manual

Page: 74 / 140

SLIM DUCT TECHNICAL OVERVIEW
F-6
ENGLISH
Topic Title Testing
If the internal condensate pump does not operate, the pump
may be bad or the float switch may be defective. Perform the
following test:
1. Access the electrical control box.
2. Unplug the float switch from the circuit board.
Test Condensate Pump and Float Switch
The unit has a built-in condensate pump and water level
safety switch. There are also two optional ports for gravity
drainage. The condensate pump is rated to lift water up to 27
9/16” from the point of discharge.
The unit comes with a grey connection hose with clamp. This
hose is connected to the High ESP Duct unit condensate
discharge hose port. The other end of the hose is sized to
accept 3/4 inch PVC piping.
Recommended condensate piping configurations are shown
here:
3. The pump should start.
4. If the pump does not start, check for voltage at the control
board pump connection. There should be 230 Volts AC to
the pump. If there is not, the circuit board is defective. If
there is proper voltage to the pump, either the pump or
associated pump wiring is defective.
Testing Communication Circuit
If an Error E7 occurs, perform the following test to determine
if the indoor control board is functioning properly to send data
to the outdoor unit.
Perform this test with the unit powered and all wiring
connected between indoor and outdoor unit.
Make sure all wiring between the indoor and outdoor unit
are correct. There should no splices between the indoor and
outdoor unit wiring connecting terminals 1 or 3. Make sure
wiring is correct, before performing this test.
1. Measure the DC voltage between terminals 1 and 3 on the
indoor terminal block.
2. The voltage should fluctuate between 8VDC and 23VDC.
The fluctuating signal indicates a good communication
path.
3. If the voltage does not fluctuate, and the wiring is good,
the indoor board is defective.
When installing, the condensate discharge port at the
top of the water pump must be connected with drian
pipe.