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INSTALLATION INSTRUCTIONS
OPERATION
Standby – no call for unit operation
Standby – no call for unit operation
Low Stage Cool/Heat Operation
High Stage Cool/Heat Operation
*Sequence: Compressor contactor is de−energized and outdoor fan is energized for up to 15 minutes. If demand still exists, control will energize compressor.
12
Table 6 − Status Codes
AMBER LED
FAULT
FLASH CODE
None
On solid, no flash
None
None
1, pause
None
2, Pause
System Communications
Failure
Invalid Model Plug
High Pressure
Switch Open
Low Pressure
Switch or Discharge Temp
Switch Open
Control Fault
Brown Out
(230 v)
No 230v at Unit
Outdoor Air Temp Sensor
Fault
Outdoor Coil Sensor Fault
Thermistors out
of range
Low Stage
Thermal Cutout
High Stage
Thermal Cutout
Contactor Shorted
No 230V at
Compressor
Low Stage Thermal
Lockout
High Stage Thermal
Lockout
Low Pressure Lockout
High Pressure
Lockout
R−410A Split System Air Conditioner
Possible Cause and Action
Normal operation
Off
Normal operation
Normal operation
Normal operation
Communication with Observer Wall Control lost. Check wiring to
16
Observer Wall Control, indoor and outdoor units
Control does not detect a model plug or detects and invalid model
25
plug. Unit will not operate without correct model plug.
High pressure switch trip. Check refrigerant charge, outdoor fan
31*
operation and coils for airflow restrictions.
Low pressure switch or discharge temperature switch trip. Check
32*
refrigerant charge and indoor air flow
Outdoor unit control board has failed. Control board needs to be
45
replaced.
Line Voltage <187v for at least 4 seconds. Compressor and fan
46
operation not allowed until voltage > 190v. Verify line voltage.
There is not 230v at the contactor when indoor unit is powered and
47
cooling/heating demand exists. Verify the disconnect is closed and
230v wiring is connected to the unit.
Outdoor air sensor not reading or out of range. Ohm out sensor and
53
check wiring
Coil sensor not reading or out of range. Ohm out sensor and check
55
wiring
Improper relationship between coil sensor and outdoor air sensor.
56
Ohm out sensors and check wiring.
Compressor operation detected then disappears while low stage
71*
demand exists. Possible causes are internal compressor overload trip
or start relay and capacitor held in circuit too long (if installed)
Compressor operation detected then disappears while high stage
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
73
operation exists. Contactor may be stuck closed or there is a wiring
error.
Compressor voltage not sensed when compressor should be starting.
74
Disconnect may be open or contactor may be stuck open or there is a
wiring error.
Thermal cutout occurs in three consecutive low/high cycles. Low stage
81
locked at for 4 hours or until 24v power recycled.
Thermal cutout occurs in three consecutive low/high cycles. High
82
stage locked at for 4 hours or until 24v power recycled.
Low pressure switch trip has occurred during 3 consecutive cycles.
83
Unit operation locked out for 4 hours or until 24v power recycled.
High pressure switch trip has occurred during 3 consecutive cycles.
84
Unit operation locked out for 4 hours or until 24v power recycled.
421 01 1701 00
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