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Compressor Heating/Cooling Display – System Status
Heating Stage:
Shows what stage of furnace heating is currently operating. Shown only while heating is
active and unit is set up to work as staged equipment (not modulating).
The display example in this table shows the LED display when the 1st stage heat is active.
Dehumidification Mode:
Shows that the unit is providing dehumidification instead of straight cooling.
Cooling Stage:
Shows what stage of cooling is currently operating.
The display example in this table shows the LED display when the 2nd stage cooling is
active.
Defrost Mode:
Shown only while in an active defrost
(simultaneous Y, W, and O).
a
The current display mode is immediately interrupted if the operating mode changes
LED Error Codes
There are four types of LED error codes:
• Warning Only: IFC continues normal operation.
• Wait for Recovery: IFC resumes normal operation after
fault recovers.
• Soft Lockout: A state caused by failure internal to the
control or by a system fault such as loss of flame or
pressure switch failure. Heating related functionality is
Error/Fault Condition
Outside air sensor out of range
(open or no discharge air sensor is OK)
Low flame in run mode
Discharge air sensor (DAS) out of range
(open or no discharge air sensor is OK)
Firing rate reduced to match CFM
Restricted airflow cooling or continuous fan
Line voltage low
Line voltage high
Zero crossing not detected or frequency out of
range
Low 24 volts
Flame circuit check error
Hardware failure
Micro inter-communication failure
Circulator communication failed
Gas valve miswire
Low pressure switch failed (stuck) Open
S9240F1004 MODULATING HOT SURFACE IGNITION INTEGRATED FURNACE CONTROL
Table 11. Compressor Heating/Cooling LED Display.
Description
Table 12. LED Status Codes.
Code
180 None
240 None
310 None
311 Reduce firing rate every 60 seconds to match available CFM.
312 None
110 Resume normal operation after fault recovers.
113 Resume normal operation after fault recovers.
115 Resume normal operation after fault recovers.
115 Resume normal operation after fault recovers.
Resume normal operation 300 seconds after fault recovers.
a
125
Resume normal operation 300 seconds after fault recovers.
a
125
Resume normal operation 300 seconds after fault recovers.
a
125
201 Resume normal operation after fault recovers.
204 Resume normal operation after fault recovers.
223 If longer than 300 seconds, start pressure switch calibration.
27
inhibited during Soft Lockout. Assuming the fault that sent
the IFC to Soft Lockout has cleared, Soft Lockout exits
after the Auto Restart Delay when a call for heat is active.
The operator can cycle power to remove the Soft Lockout
without waiting for the Auto restart Delay.
• Hard Lockout: A state caused by a failure internal to the
control or by a system fault such as a flame rollout. Heating
related functionality is inhibited during Hard Lockout. Hard
Lockout can be exited only by cycling power to the IFC.
Error Handling
(in addition to displaying error code)
Display Example
(LED display in bold)
H 1
Pause
Display CFM
Repeat
D
Pause
Display CFM
Repeat
C 2
Pause
Display CFM
Repeat
D F
Pause
Display CFM
Repeat
Recovery
a
Result
Warning
Only
Wait for
69-2088—01
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