Johnson Controls Hx 3 S1-THXU430W Installation Manual page 51

5407934-UIM-C-1119
TABLE 16: Modulating Furnace (Continued)
Fault (Displayed Text) Description
FURNACE: PRESSURE
SWITCH CLOSED
FURNACE: SOFT LIMIT
WARNING
FURNACE: AIR BLOCK-
AGE WARNING
FURNACE: UNKNOWN
FAILURE
FURNACE: FLAME ROD
AGE WARNING
Johnson Controls Ducted Systems
Pressure switch closed with inducer
pressure below pressure switch set-
point (switch is closed when it should
be open). Check pressure switch.
Soft limit warning
Air blockage warning
Unknown failure
Flame rod age warning
Category
Efficiency
Efficiency
Efficiency
Efficiency
Efficiency
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