5120410-XIM-B-0216
56 Johnson Controls Unitary Products
Charging The Unit
All DC units use Thermal Expansion Devices. Charge the unit
to nameplate charge or 10° subcooling.
Table 37: Ignition Control Flash Codes
Flashes Fault Conditions Check
STEADY ON Control Failure Control
HEARTBEAT Normal Operation
1 Not Applicable
2
Pressure Switch
Stuck Closed
Pressure Switch
3
Pressure Switch Failed
To Close
Venter Pressure Switch
Vent Blocked
4 Limit Switch Open
Main Limit
AUX Limit
5
Flame Present With Gas
Off First Stage Gas Valve
Energized With W1 Off
Second Stage Gas Valve
Energized With First
Stage
Gas Valve Off
Gas Valve
6 Ignition Lockout
Gas Flow
Gas Pressure
Gas Valve
Flame Sensor
STEADY OFF
No Power Or Control
Failure
24VAC or Control
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