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14
Status Codes
Table 6 shows the status codes flashed by the amber status light.
Most system problems can be diagnosed by reading the status code
as flashed by the amber status light on the control board.
The codes are flashed by a series of short and long flashes of the
status light. T he short flashes indicate the first digit in the status
code, followed by long flashes indicating the second digit of the
error code.
The short flash is 0.25 seconds ON and the long flash is 1.0 second
ON. Time between flashes is 0.25 seconds. Time between short
flash and first long flash is 1.0 second. Time between code
repeating is 2.5 seconds with LED OFF.
EXAMPLE:
3 short flashes followed by 2 long flashes indicates a 32 code.
Table 6 shows this to be low pressure switch open.
Table 6 – TROUBLESHOOTING
OPERATION
FAULT
AMBER LED
FLASH
CODE
POSSIBLE CAUSE AND ACTION
Standby – no call for unit operation None
On solid, no
flash
Normal operation
Low S tage Cool/Heat Operation None 1, pause Normal operation
High Stage Cool/Heat Operation None 2, pause Normal operation
System Commu-
nicationsFailure
16 Communication with User Interface lost. Check wiring to UI, i ndoor and
outdoor u nits
Invalid Model Plug 25
Control does not detect a model plug or detects an invalid model plug. Unit
will not operate without correctmodel plug.
High Pressure
Switch Open
31*
High---pressure switch trip. Check refrigerant charge, outdoor fan operation
and coils for airflow restrictions.
Low Pressure
Switch Open
32* Low---pressure switch trip. Check refrigerant charge and indoor air flow.
Control Fault 45 Outdoor unit c ontrol board has failed. Control board needs to be replaced.
Brown Out (230 v) 46
Line voltage <187v for a t least 4 seconds. Compressor and fan operation
not allowed until voltage>
190v. Verify l ine voltage.
No 230v at Unit 47
There isn o 230v at the contactor when indoor unit is powered and cooling/
heating demand exists. Verify the disconnect isclosed and 230v wiring is
connected to the unit.
Outdoor Air Temp
Sensor Fault
53
Outdoor air sensor not reading or out of r ange. Ohm out sensor and check
wiring.
Outdoor Coil
Sensor Fault
55 Coil sensor not reading or out of range. Ohm out sensor and check wiring.
Thermistors out of
range
56
Improper relationship between coil sensor and outdoor air sensor. Ohm out
sensors and check wiring.
Low Stage
Thermal Cutout
71*
Compressor operation detected then disappears while low stage demand
exists. Possible causesare internal compressor overload trip or start relay
and capacitor held in circuit too long (if installed).
High Stage
Thermal Cutout
72*
Compressor operation detected then disappears while high stage d emand
exists. Possible causesare internal compressor overload trip or start relay
and capacitor held in circuit too long (if installed).
Contactor Shorted 73
Compressor voltage sensed when no demand for compressor operation
exists. Contactor may be stuck closed or there is a wiring error.
No 230V at
Compressor (288A
Only)
74
Compressor voltage not sensedwhen compressor shouldbe starting. Con-
tactor may be stuck open or there is a wi ring error.
Low Stage DidNot
Start
(286A Only )
75
Specified start voltage at VRterminal was not achieved in low stage. Start
relay wasde---en ergized after 1 second.
Low Stage DidNot
Start 3 times(286A
Only)
76
For 3 consecutive low stage starts, the s pecified start voltage at VR terminal
was not achieved & start r el a y was de---energized. Low stage locked ou t for
30 minutes.
High Stage DidNot
Start
(286A Only )
77
Specified start voltage at VS terminal was not achieved in high stage. Start
relay wasde---en ergized after 1 second.
High Stage DidNot
Start 3 times(286A
Only)
78
For 3 consecutive high stage starts, the specified start voltage at VS terminal
was not achieved & start r elay was de---en er gized. High stage locked out for
30 minutes.
Low Stage
Thermal Lockout
81
Thermal cutout occurs in three consecutive low/high stage cycles. Low
stagelockedout for 4 hours or until 24v power recycled.
High Stage
Thermal Lockout
82
Thermal cutout occurs in three consecutive high/low stage cycles. High
stagelockedout for 4 hours or until 24v power recycled.
Low---Pressure
Lockout
83
Low pressure switch trip has occurred during 3 consecutive cycles. Unit
operation locked out for 4 hours or until 24v power recycled.
High ---Pressure
Lockout
84
High pressure switch trip has occurred during 3 consecutive cycles. Unit
operation locked out for 4 hours or until 24v power recycled.
Low C ontactor
Open
(286A Only )
85
Compressor voltage not sensed when compressor should be starting. Low
stage contactor may be stuck open or there is a wiring error.
High Co ntactor
Open
(286A Only )
87
Compressor voltage not sensed when compressor should be starting. High
stage contactor may be stuck open or there is a wiring error.
* Sequence: Compressor contactor is de---energized and outdoor fan is ener gized for up to 15 minutes. If demand still exists, control will energize compressor
contactor after 15 minute delay. If fault is cleared, unit will resume operation. If fault still exists, fan shuts off, and error code continues to flash. Control will
attempt re---start every 15 minutes. Cycling low voltage defeats the 15 minute delay.
286A / 288A