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Status Codes
Table 23 shows the status codes flashed by the amber status light.
Most system problems can be diagnosed by reading the statuscode
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. The 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 23 shows this to be low pressure switch open.
Table 23—167A / 266A TROUBLESHOOTING
OPERATION
FAULT
AMBER LED
FLASH
CODE
POSSIBLE CAUSE AND ACTION
Standby – n o call for unit operation None
On solid, no
flash
Normal operation
Low Stage Cool/HeatOperation 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 User Interface,
indoor andoutdoor units
Invalid Model P lug 25
Control does not detect a model plug or detects an invalid model plug. Unit
will notoperate withoutcorrect model plug.
High Pressure
Switch Open
31*
High---pressureswitch trip. Check refrigerantcharge,outdoorfan operation
and coilsfor airflowrestrictions.
Low Pressure
Switch or Dis-
charge Temp
Switch Open
32*
Low---pressure switch ordischarge temperature switch trip. Checkrefrigerant
charge and indoor air flow.
Control Fault 45 Outdoor unit control board has failed. Control board needs to be replaced.
Brown Out (230 v) 46
Line voltage < 187vfor a t least 4 seconds. Compressor and fan operation
notalloweduntilvoltage>
190v. Verify line voltage.
No 230v at Unit 47
There is no 230v atthe contactor when indoor unit ispowered and cooling/
heating demand exists. Verify the disconnect isclosed and 230v wiringis
connectedtothe unit.
Outdoor Air T emp
Sensor Fault
53
Outdoor air sensor not reading or out of range.Ohm out sensor and check
wiring.
Outdoor Coil
Sensor Fault
55 Coil sensor notreadingor outof range.Ohm outsensor and checkwiring.
Thermistors outof
range
56
Improper relationship between coil sensor and outdoor air sensor. Ohm out
sensorsand checkwiring.
LowStage
Thermal Cutout
71*
Compressor operation detected then disappears while low stage demand
exists. Possiblecausesare internal compressor overloadtripor startrelay
andcapacitor heldin circuittoo long (ifinstalled).
High Stage
Thermal Cutout
72*
Compressor operation detected then disappears while high stage demand
exists. Possiblecausesare internal compressor overloadtripor startrelay
andcapacitor heldin circuittoo long (ifinstalled).
Contactor Shorted 73
Compressor v oltage sensed when no demand for compressor operation
exists. Contactor may be stuck closed or there is a wiring error.
No 230V at
Compressor
74
Compressor voltagenot sensedwhen compressor shouldbestarting.Con-
tactor may be stuck open or there is a wi ring error.
LowStage
Thermal Lockout
81
Thermal cutout occurs in three consecutive low/high stage cycles. Low
stage lockedout for 4 hoursor until 24vpowerrecycled.
High Stage
Thermal Lockout
82
Thermal cutout occurs in three consecutive high/low stage cycles. High
stage lockedout for 4 hoursor until 24vpowerrecycled.
Low---Pressure
Lockout
83
Low pressure switch trip has occurred during 3 consecutive cycles. Unit
operation lockedout for4 hoursor until 24v power recycled.
High---Pressure
Lockout
84
High pressure switch trip has occurred during 3 consecutive cycles. Unit
operation lockedout for4 hoursor until 24v power recycled.
* Sequence:Compressorcontactor isde---energized and outdoorfan isenergizedfor upto 15minutes. Ifdemandstillexists,controlwill energizecompressorcontactorafter15 minute
delay. Iffaultiscleared,unitwillresumeoperation.Iffaultstillexists,fanshutsoff, anderrorcodecontinuestoflash.Controlwill attemptre---start every 15 minutes. Cycling low voltage
defeats the 15 minute delay.