S9200U1000 UNIVERSAL HOT SURFACE IGNITION INTEGRATED FURNACE CONTROL
69-2075—01 20
Table 11. Control Status Codes (Red LED).
Flash
Code
a
Red LED Status Code and Error
Description Check / Repair
Pulse Control powered (Standby; No Call for
Heat)
Not Applicable
Heartbeat Call for Heat - Normal operation Not Applicable (normal operation)
Pressure Switch Codes
2 Pressure Switch failed Open Check: If inducer is running, inducer could be broken or disconnected, or inducer relay
K4 may have failed.
Check/Repair: Low line voltage; Pressure switch wiring loose; hose disconnected or
leaking; water in hose; venting blocked or obstructed.
3 Pressure Switch failed Closed Check: If inducer is off; inducer relay (K4) could be welded.
Check/Repair: Terminal wiring (shorted); pressure switch contacts (closed when should
be open); pressure switch hoses have water build-up or obstruction.
4 Pressure Switch opened during Trial For
Ignition or Run Mode
Check: See if inducer is running.
Check/Repair: Restricted venting; low input voltage; water in horizontal vent length.
Limit Code
5 Limit switch open Check: Wiring; restricted airflow through heat exchanger; clogged filters; slow circulator
fan speed.
Repair: Remove restrictions. Increase airflow through furnace (increase motor speed,
open more ducts, add more returns).
Flame Code
6 Unexpected flame - Waiting for flame to be
off after the 20 second delay
Check/Repair: Gas valve leakage.
Soft Lockout Codes
2 + 1 Soft Lockout - Exceed maximum number
of retries
Check/Repair: Gas supply (pressure, supply, shut-off valves, gas valve); ignition (HSI
element not properly positioned and glowing); flame sensing (lead-wire broken or
grounded, flame rod not properly positioned, or flame rod contamination); low line
voltage.
2 + 3 Soft Lockout - Exceeded maximum
number of recycles or retries where the
last recycle/retry was due to the pressure
switch opening
Check/Repair: Pressure switch wiring; slow inducer; restricted, excessive, or obstructed
venting; unstable line voltage.
2 + 4 Soft Lockout - Exceeded maximum
number of recycles where the last recycle
was due to a flame failure
Check/Repair: Gas supply; flame sensor wiring.
2 + 5 Soft Lockout - Exceeded maximum
number of recycles where the last recycle
was due to the limit circuit opening or the
limit remained open longer than three
minutes
Check: Wiring; restricted airflow through heat exchanger; clogged filters; slow circulator
fan speed.
Repair: Remove restrictions. Increase airflow through furnace (increase motor speed,
open more ducts, add more returns).
2 + 6 Soft Lockout - Gas Valve Failed to Make Check/Repair: Gas valve, Gas valve wiring.
Replace S9200U1000 if problem persists.
Other Codes
3 + 1 Low 24V (Control restarts if the error
recovers)
Check/Repair: Low voltage transformer and circuit.
Voltage should be nominally 24 Vac with 120 Vac on incoming line voltage. Verify low
voltage under all thermostat request modes to insure there are no issues with other low
voltage loads such as the outdoor unit 24 Vac contactor.
3 + 2 Bad Fuse Check: Wiring (limit, rollout, pressure switch shorted to chassis; EnviraCOM™ bus);
gas valve could be shorted.
Turn off the power and replace the fuse with a fuse of the same type.
Cycle power to appliance and run heating sequence.
If this failure repeats, replace the control.
3 + 4 Gas valve error - Miswire or welded
(Control restarts if the error recovers and it
has not been detected five times yet)
Check/Repair: Gas valve wiring.
Cycle power to appliance and run heating sequence.
If this failure repeats, replace the control.
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