Johnson Controls
5586996-JSG-A-0120 | Start-Up & Operation Guide
54
Display Code Color Description
41 RED Air pressure low switch is closed when inducer is OFF.
42 RED Air pressure high switch is closed when inducer is OFF or at low speed.
43 RED Air pressure low switch is open when it is expected to be closed.
44 RED Air pressure high switch is open or closed when it is expected to be closed or open.
45 RED Fuse is open.
51 RED Primary limit is open.
52 RED Safety checks at start-up failed. Flame circuitry idle state is incorrect.
54 RED ID plug failure. Reserved for future use.
55 RED Control board failure: gas valve relays, safety relays, etc.
steady RED Control is not functional.
rapid RED ID plug failure to initialize, control is not functional.
11 YELLOW Indicates that ame rod has low current.
21 YELLOW Indicates that ame rod has low current.
31 YELLOW Indicates that both ame rods measured low current.
13 YELLOW Call for heat, prime burner is in RETRY.
23 YELLOW Call for heat, split burner is in RETRY.
52 YELLOW Control is in idle mode, keep alive timeout is expired.
53 YELLOW Control is in idle mode, manual override is in OFF position.
11 GREEN Prime burner and split burner is in OFF state.
12 GREEN Burner state purge.
13 GREEN Prime burner is running, burner states GAS_ON, WARMUP, RUN.
33 GREEN Split and prime burners are running.
11 GREEN/YELLOW Prime burner is OFF, split burner is in lockout.
12 GREEN/YELLOW Burner states PURGE, split burner is in lockout.
13 GREEN/YELLOW
Prime burner is running, burner states GAS_ON, WARMUP, RUN. Split burner is in
lockout.
None None Board not receiving 24 volts.
Modulating Gas Heat
The following sequence refers to the modulating burner
only or burners 1A and 1B, which are arranged in a split
manifold design. Any other burners (2 or 3) are con-
trolled by the staged gas sequence referenced above.
The modulating gas controller receives a demand for
heat from the unit controller through a Modbus signal.
The controller performs a system check to ensure that
all safeties are closed, the APS is open, and the modu-
lating valve is positioned correctly.
• When the system check is satisfactory, the con-
troller enters the pre-purge cycle
• During the pre-purge cycle, the controller en-
sures the APS opens and closes at the cor-
rect settings
• When the pre-purge cycle is satisfactory, the con-
troller enters the ignition cycle
Table 25: Staged Gas Heating Faults List (Continued)
• The modulating valve and inducer enters
their light-off settings
• The DSI module and the spark ignitor energize
• The 2-stage gas valve opens, allowing gas flow
• The burners ignite and the controller receives
flame rectification from the flame sensor
• The spark ignitor remains active for the dura-
tion of the ignition cycle regardless of flame
status
• When flame rectification is not estab-
lished during the ignition cycle, the con-
troller repeats the above sequence up
to three times.
• After three failed ignition attempts, the
controller enters a 1-hour lockout
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