Bryant Evolution 180A Installation Instructions Manual page 13

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. 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
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
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.
Table 6 – TROUBLESHOOTING
AMBER
LED
FAULT
FLASH
CODE
On solid, no
None
flash
None 1, pause
None 2, pause
System Commu- 16
nications Failure
Invalid Model Plug 25
High Pressure
31*
Switch Open
Low Pressure
32*
Switch Open
Control Fault 45
Brown Out (230 v) 46
No 230v at Unit 47
Outdoor Air Temp
53
Sensor Fault
Outdoor Coil Sen-
55
sor Fault
Thermistors out of
56
range
low---stage Ther-
71*
mal Cutout
high ---stage Ther-
72*
mal Cutout
Contactor Shorted 73
No 230V at Com-
pressor 74
(180A Only)
low---stage Did Not
Start 75
(187A Only)
low---stage Did Not
Start 3 times 76
(187AOnly)
high ---stage Did
Not Start 77
(187A Only)
high ---stage Did
Not Start 3 times 78
(187A Only)
low---stage Ther-
81
mal Lockout
high ---stage Ther-
82
mal Lockout
Low Pressure
83
Lockout
High Pressure
84
Lockout
Low Contactor
Open 85
(187A Only)
High Contactor
Open 87
(187A Only)
between short flash and first long flash is 1.0 second.
between code repeating is 2.5 seconds with LED OFF.
Count the number of short and long flashes to determine the
appropriate flash code. Table 6 gives possible causes and actions
related to each error.
EXAMPLE:
3 short flashes followed by 2 long flashes indicates a 32 code.
Table 6 shows this to be low pressure switch open.
POSSIBLE CAUSE AND ACTION
Normal operation
Normal operation
Normal operation
Communication with user interface lost. Check wiring to User Interface,
indoor and outdoor units
Control does not detect a model plug or detects an invalid model plug. Unit
will not operate without correct model plug.
High ---pressure switch trip. Check refrigerant charge, outdoor fan operation
and coils for airflow restrictions.
Low pressure switch trip. Check refrigerant charge and indoor air flow
Outdoor unit control board has failed. Control board needs to be replaced.
Line voltage < 187v for at least 4 seconds. Compressor and fan operation
not allowed until voltage>190v. Verify line voltage.
There is no 230v at the contactor when indoor unit is powered and 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 check
wiring.
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
sensors and check wiring.
Compressor operation detected then disappears while low---stage 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 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 operation
exists. Contactor may be stuck closed or there is a wiring error.
Compressor voltage not sensed when compressor should be starting. Con-
tactor may be stuck open or there is a wiring error.
Specified start voltage at VR terminal was not achieved in low---stage. Start
relay was de ---energized after 1 second.
For 3 consecutive low---stage starts, the specified start voltage at VR terminal
was not achieved & start relay was de ---energized. low---stage locked out for
30 minutes.
Specified start voltage at VS terminal was not achieved in high ---stage. Start
relay was de ---energized after 1 second.
For 3 consecutive high ---stage starts, the specified start voltage at VS termi-
nal was not achieved & start relay was de ---energized. high ---stage locked
out for 30 minutes.
Thermal cutout occurs in three consecutive low/ high ---stage cycles. low---
stage locked out for 4 hours or until 24v power recycled.
Thermal cutout occurs in three consecutive high/low---stage cycles. high ---
stage locked out for 4 hours or until 24v power recycled.
Low pressure switch trip has occurred during 3 consecutive cycles. Unit
operation locked out for 4 hours or until 24v power recycled.
High pressure switch trip has occurred during 3 consecutive cycles. Unit
operation locked out for 4 hours or until 24v power recycled.
Compressor voltage not sensed when compressor should be starting. low---
stage contactor may be stuck open or there is a wiring error.
Compressor voltage not sensed when compressor should be starting. high ---
stage contactor may be stuck open or there is a wiring error.
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Time