Bryant Base Series Application Manual And Service Manual page 51

Residential Air Conditioners and Heat Pumps Using R-22 and Puron® Refrigerant: Application Guideline and Service Manual
OPERATION
Standby – no call for unit
operation
Cool/Heat Operation
System Communications
High Pressure Switch
Low Pressure Switch
Outdoor Air Temp Sensor
Outdoor Coil Sensor Fault
Thermistors out of range
No 230V at Compressor
Low Pressure Lockout
High Pressure Lockout
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
Table 14 – Status Codes
AMBER LED
FAULT
FLASH CODE
None On solid, no flash
None 1, pause
Failure
Open
Open
Control Fault
Brown Out
(24 v)
Fault
Thermal Cutout
Contactor Shorted
Thermal Lockout
Normal operation
Normal operation
Communication with user interface lost. Check wiring to UI, indoor and
16
outdoor units
High pressure switch trip. Check refrigerant charge, outdoor fan operation
31
and coils for airflow restrictions.
32 Low pressure switch trip. Check refrigerant charge and indoor air flow
45 Outdoor unit control board has failed. Control board needs to be replaced.
The control voltage is less than 15.5v for at least 4 seconds. Compressor
46 and fan operation not allowed until control voltage is a minimum of 17.5v.
Verify control voltage.
Outdoor air sensor not reading or out of range. Ohm out sensor and check
53
wiring
55 Coil sensor not reading or out of range. Ohm out sensor and check wiring
Improper relationship between coil sensor and outdoor air sensor. Ohm out
56
sensors and check wiring.
Compressor voltage sensed after start–up, then absent for 10 consecutive
seconds while cooling demand exists. Possible causes are internal
72
compressor overload trip or loss of high voltage to compressor without loss
of control voltage.
Compressor voltage sensed when no demand for compressor operation
73
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 cycles. Unit operation locked
82
out for 4 hours or until 24v power recycled.
Low pressure switch trip has occurred during 5 consecutive cycles. Unit
83
operation locked out for 4 hours or until 24v power recycled.
High pressure switch trip has occurred during 5 consecutive cycles. Unit
84
operation locked out for 4 hours or until 24v power recycled.
51
POSSIBLE CAUSE AND ACTION