Installation guide

Table 6 - Status Codes
AMBER LED
OPERATION FAULT Possible Cause and Action
FLASH CODE
Standby- no call for unit operation None On solid, no flash Normal operation
Low Stage Cool/Heat Operation None 1, pause Normal operation
High Stage Cool/Heat Operation None 2, Pause Normal operation
Brown out protection is Disabled None 5, pause User mode selection, see instructions for more detail
Brown out protection is Active None 6, Pause User mode selection, see instructions for more detail
System Communications 16 Communication with Observer Wall Control lost. Check wiring to
Failure Observer Wall Control, indoor and outdoor units
Control does not detect a model plug or detects and invalid model
Invalid Model Plug 25
plug. Unit will not operate without correct model plug.
High Pressure 31" High pressure switch trip. Check refrigerant charge, outdoor fan
Switch Open operation and coils for airflow restrictions.
Low Pressure
Low pressure switch or discharge temperature switch trip. Check
Switch or Discharge Temp 32* refrigerant charge and indoor air flow
Switch Open
Outdoor unit control board has failed. Control board needs to be
Control Fault 45 replaced.
Brown Out 46 Line Voltage <187v for at least 4 seconds. Compressor and fan
(230 v) operation not allowed until voltage > 190v. Verify line voltage.
There is not 230v at the contactor when indoor unit is powered and
No 230v at Unit 47 cooling/heating demand exists. Verify the disconnect is closed and
230v wiring is connected to the unit.
Outdoor Air Temp Sensor 53 Outdoor air sensor not reading or out of range. Ohm out sensor and
Fault check wiring
Outdoor Coil Sensor Fault 55 Coil sensor not reading or out of range. Ohm out sensor and check
wiring
Thermistors out 56 Improper relationship between coil sensor and outdoor air sensor.
of range Ohm out sensors and check wiring.
Low Stage Compressor operation detected then disappears while low stage
Thermal Cutout 71" demand exists. Possible causes are internal compressor overload trip
or start relay and capacitor held in circuit too long (if installed)
High Stage Compressor operation detected then disappears while high stage
Thermal Cutout 72* demand exists. Possible causes are internal compressor overload trip
or start relay and capacitor held in circuit too long (if installed)
Compressor voltage sensed when no demand for compressor
Contactor Shorted 73 operation exists. Contactor may be stuck closed or there is a wiring
error.
No 230V at Compressor voltage not sensed when compressor should be starting.
74 Disconnect may be open or contactor may be stuck open or there is a
Compressor wiring error.
Low Stage Thermal 82 Thermal cutout occurs in three consecutive low/high cycles. Low stage
Lockout locked at for 4 hours or until 24v power recycled.
High Stage Thermal 82 Thermal cutout occurs in three consecutive low/high cycles. High
Lockout stage locked out for 4 hours or until 24v power recycled.
Low pressure switch trip has occurred during 3 consecutive cycles.
Low Pressure Lockout 83
Unit operation locked out for 4 hours or until 24v power recycled.
High Pressure 84 High pressure switch trip has occurred during 3 consecutive cycles.
Lockout Unit operation locked out for 4 hours or until 24v power recycled.
*Sequence: Compressor contactor is de-energized and outdoor fan is energized for up to 15 minutes. If demand still exists, control will energize compressor.
421 01 1702 04 specificationssubjectto change without notice. 11