Maytag PSA4BG024K - Maintenance

10
18
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
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.
19
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
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.
1
Interface Board Software Corruption – This code
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 .
4
Ambient Temp Sensor Failure – This fault code
indicates an open or shorted sensor. The tip of the
sensor should be mounted near the louvers at the base
ofthecontrolcompartment.Lookforapinchedwirewith
cut insulation.
9
Cooling Low Temperature Lockout – This is
an informational code that indicates that the unit
attempted to start or run in cooling mode when
outdoor ambient temperature was below 50° F,
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
MAINTENANCE
WARNING:
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.
 
to the unit.
 
disconnecting. Reconnect wires correctly.
 
• Inspecttheindoorairlter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qualied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.