Emerson White-Rodgers 50M56-820 Directives D'installation page 6

TROUBLESHOOTING
Red LED
Flash Status/Error Condition
System Lockout (Retries or Recycles
2 Exceeded)
3 Pressure Switch Stuck Open or Closed
4 Open High Temperature Limit Switch
Flame Sensed Without Gas Valve
5 Energized
6 Reversed Polarity
7 Gas Valve Circuit Error
8 Low Flame Sense Signal
9 Ignitor Relay Fault
Slow Flash Normal operation – no Call for Heat
Fast Flash Normal operation – Call for Heat
Continuous
ON Internal Control Failure
6
FAULT RECALL
When the control is in Standby mode (no call for heat or cool),
press the fault recall switch for approximately 2 seconds or until
the diagnostic LED turns off. Up to 5 fault codes are stored.
NOTE: While displaying the stored fault codes, the control will
ignore any new call for heat, cool or fan.
FAULT CODE RESET
When the control is in Standby mode (no call for heat or cool),
press the fault recall switch for 5 to 10 seconds or until the
diagnostic LED begins to rapid flash.
NOTE: If the switch is pressed for over 10 seconds the rapid
flash will stop and the LED will be on to indicate return to
normal status.
CONTROL RESET
1. 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 the call for
heat at the thermostat will not reset the control).
2. Interrupt the 24 VAC power at the control for at least one
second. You may also need to reset the flame rollout sensor
switch.
3. After one hour in lockout, the control will automatically reset
itself.