White-Rodgers Lockout Codes

WHITE-RODGERS FURNACE CONTROL - LOCKOUT CODES

When system lockout occurs, the gas valve is de-energized, the circulator blower is energized at HEAT speed, and, if flame is sensed, the inducer blower is energized. The diagnostic indicator light will flash or glow continuously to indicate system status.

50A55 & 50M56 Integrated Furnace Control

Code	Description
1	System lockout due to failed ignition attempts
2	Pressure switch stuck closed
3	Pressure switch stuck open
4	Open limit switch
5	Flame sensed with gas valve de-energized
6	Open rollout (or blown fuse)
7	Low flame sense signal
8	Igniter relay fault
Rapid	Reversed polarity
On	Normal operation
Off	No power or bad control

50A50-206 Integrated Furnace Control

Code	Description
On	Replace control
1	Lockout due to failed ignition
2	Pressure switch stuck closed
3	Pressure switch stuck open
4	Open limit
5	Missing jumper wire
Rapid	Flame sensed with no call for heat

50A50-241 & 50A51-243 Integrated Furnace Control

Code	Description
On	Replace Control
2	Pressure switch stuck closed
3	Pressure switch stuck open
4	Open limit switch
5	Open rollout switch
6	Lockout caused by pressure switch
7	Lockout caused by no ignition
8	Lockout caused by loss of flame
Rapid	Flame sensed with no call for heat
Off	No power or bad control

To Reset the control after a lockout, do one of the following:

Interrupt the call for heat or cool at the thermostat for at least one second but less than 20 seconds (if flame is sensed with the gas valve de-energized, interrupting a call for heat will not reset the control).
Interrupt 24VAC power at the control for at least one second. You may also need to reset the flame rollout switch.
After one hour in lockout, the control will automatically attempt a reset.

Non-Integrated Furnace Control

Code	Description
Green On	Normal Operation
Green Flashing	Weak flame signal
Yellow On	Internal Self-Check
Yellow Flashing	Improper Polarity
Red On	Replace Control
Red Flashing	Lockout