Air Conditioner Maintenance; Panel Removal; Panel Installation - Maytag iQDrive SA1BG4MV Series Installation Instructions Manual

Outdoor Fan Fault – Check that 208/230 vac line power
is being provided through the main contactor to the fan.
In 5-ton models this is through a terminal block located
to the right of the contactor. If ok, check that the 2-wire
fan power harness (brown and black wires) is connected
as indicated on the wiring diagram. If ok, check that the
fan control harness is properly connected at J15 (PWM
FAN CONTROL) at the top edge, center, of the control
18
board. If ok, check the small square white label on the
interface board which has two numbers printed along
its edges. Examine the date code number, the one that
does not begin with "1AC3". If this other number begins
with "1235" or lower, replace the interface board. If this
date code starts with "1245" or higher, and the other
checks do not reveal the source of the problem, replace
the fan motor.
Low Pressure Switch Open – A low pressure condition
(less than 20 psig (±5)) must exist in the suction line for
more than 4 minutes to trigger this fault. A pressure of
35 psig (±5) is required to reclose the switch. Check
liquid line temperature and pressure against the charging
chart to confirm that charge level is not significantly low.
Compare gage measurement against the 20 psi switch
limit (with the system running). If gage measurements
are good, check that the pressure switch is depressing
19
the Schrader pin. Verify that the blue wires from the
switch are properly connected to the LOW PRESSURE
SWITCH terminals at the lower edge, left of center, on
the interface board. If the system is normal, an active low
pressure switch fault should clear when the compressor
is off. Check continuity across the wire terminals. If the
connection is electrically open, and manual pressure
checks show that system pressure is good while running
but the fault remains active, replace the switch.
High Compressor Discharge Temperature – If
compressor discharge line temperature exceeds 221

F, this fault is triggered. Check for conditions that would
cause high discharge temperature and pressure, e.g.
fouled or blocked coil, overcharge. See also fault code .
Interface Board Software Corruption – This code
1
indicates that the interface board needs to be replaced.
It should never be encountered.
Compressor Discharge Temp Sensor Failure – This

fault code indicates an open or shorted sensor. See
also fault code .
Ambient Temp Sensor Failure – This fault code
indicates an open or shorted sensor. The tip of the
4
sensor should be mounted near the louvers at the base
of the control compartment. Look for a pinched wire with
cut insulation.
Cooling Low Temperature Lockout
an informational code that indicates that the unit
attempted to start or run in cooling mode when
outdoor ambient temperature was below 50° F,
9
which is not permitted. If such a lockout occurs, the
unit will restart when ambient temperature exceeds
55° F. If the ambient temperature sensor fails open
or is disconnected, this code will also appear.
Table 8. Continued
10

AIR CONDITIONER MAINTENANCE

ELECTRICAL SHOCK HAZARD
Failure to follow safety warnings exactly could
result in serious injury or property damage.
Improper servicing could result in dangerous
operation, serious injury, death or property
damage.
• Before servicing, disconnect all electrical power
to the unit.
• When servicing controls, label all wires prior to
disconnecting. Reconnect wires correctly.
• Verify proper operation after servicing.
• Inspect the indoor air filter monthly.Clean or replace it at the
start of each cooling season or when an accumulation of
dust or dirt is visible. If the indoor coil needs to be cleaned,
contact a qualified service technician.
• Inspect the condensate disposal line from the indoor coil
at the beginning of the cooling season to make sure it is
not obstructed.
• Remove any leaves, grass clippings, and debris from the
outdoor unit coil, being careful not to damage the aluminum
fins. Dirt may be cleared from the coil by using a water
hose directed through the discharge fan grille toward the
outside of the unit.
• Have a yearly inspection by a qualified service technician
to ensure that the system is performing at its optimum level.
• At least once a season open the control panel (with power
°
off) to inspect for and clear out insect structures and/or
cobwebs which might impede airflow through the control
panel compartment and the air inlet louvers at the bottom
of the control compartment.
• To access the internal compnents of the unit, refer to
2 (page 11)
for panel installation.

Panel Removal

1. Remove screws securing the panel.
2. Slide the panel up towards the top pan in order to clear the
bottom flange from the base pan. See
3. Swing the bottom of the panel out and pull the panel down
to remove it from the unit.

Panel Installation

This is
–
1. Insert the top corners of side panel flanges into the corner
post channels as shown in Detail A in
2. Slide the panel up into the top pan. (You may need to push
on the center of the panel at the top in order to clear the
top pan edge).
3. Swing the panel in and push down until the panel is resting
on the top edge of the base pan wall as shown in Detail B.
4. Insert screws into the panel to secure it to the unit.
WARNING:
Figure 3 (page 11)
for panel removal and
Figure 2 (page
Figure 3 (page
Figure
11).
11).