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SYSTEM LOCKOUT FEATURES
When system lockout occurs, the gas valve is de-energized.
The circulator blower may be energized at heat speed for
some faults, and if flame is sensed, the inducer blower is
energized. The diagnostic indicator light will flash or glow
continuously to indicate system status. (System lockout
will never override the precautionary features.)
To reset the control after system lockout, do one of
the following:
1. Interrupt the call for heat at the thermostat for at least
one second, but for less than 20 seconds (if flame is
sensed with the gas valve de-energized, interrupting the
call for heat at the thermostat will not reset the control).
SYSTEM LOCKOUT AND DIAGNOSTIC FEATURES
2. Interrupt the 24 VAC power at the control for at least
ten seconds. You may also need to reset the flame
rollout sensor switch.
3. After one hour in lockout, the control will automatically
reset itself.
DIAGNOSTIC FEATURES
The 50A66-743 control continuously monitors its own
operation and the operation of the system. If a failure oc-
curs, the DS 1 (red) and DS 2 (green) LEDs will indicate
a failure code as shown below.