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ページを印刷するDS1 and DS2 System Status, Fault and Lockout Codes
DS2
DS1
Type
Green
Red
OFF
OFF
Status
Simultaneous
Status
SLOW Flash
Alternating
Status
SLOW Flash
Simultaneous
Fault
FAST Flash
Alternating
Fault
FAST Flash
ON
ON
Fault
SLOW
OFF
Fault
Flash
OFF
ON
Lockout
SLOW
OFF
Fault
Flash
ON
OFF
Lockout
(Each fault adds 1 strike to that code's counter; 5 strikes per code = LOCKOUT)
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Condition / Code
No power (24V) to demand
defrost control terminals R and
Power Problem
C or demand defrost control
failure.
Unit operating normally or in
Normal operation
standby mode.
5-minute anti-short
Initial power up, safety trip, end
cycle delay
of room thermostat demand.
Sensor being detected open or shorted or out of temperature range. Demand
Ambient Sensor
defrost control will revert to time/temperature defrost operation. (System will still
Problem
heat or cool).
Sensor being detected open or shorted or out of temperature range. Demand
Coil Sensor
defrost control will not perform demand or time/temperature defrost operation.
Problem
(System will still heat or cool.)
Indicates that demand defrost control has internal component failure. Cycle
Demand Defrost
24VAC power to demand defrost control. If code does not clear, replace demand
Control Failure
defrost control.
Low Pressure Fault
• Restricted air flow over
indoor or outdoor coil.
• Improper refrigerant charge
Low Pressure
in system.
Lockout
• Improper metering device
installed or incorrect
High Pressure Fault
operation of metering device.
• Incorrect or improper sensor
location or connection to
High Pressure
system.
Lockout
Table 3. Demand Defrost Control Diagnostic LEDs
Possible Cause(s)
Issue 1846
Solution
1. Check control transformer power (24V).
2. If power is available to demand defrost
control and LED(s) do not light, replace
demand defrost control.
None required.
None required (jumper TEST pins to override)
• Remove any blockages or restrictions from
coils and/or fans. Check indoor and outdoor
fan motor for proper current draws.
• Check system charge using subcooling
method.
• Check system operating pressures and
compare to unit subcooling tables located on
unit access panel.
• Make sure all pressure switches and sensors
have secure connections to system to
prevent refrigerant leaks or errors in pressure
and temperature measurements.
507919-01F