Service Manual

51
OPERATIONAL CHECKS
Troubleshooting
HIGH VOLTAGE !
T O AVOID PERSONAL INJURY OR DEATH DUE TO
ELECTRICAL SHOCK , DISCONNECT ELECTRICAL POWER
BEFORE
PERFORMING ANY SERVICE OR MAINTENANCE .
WARNING
Refer to the Troubleshooting Codes for assistance in determin-
ing the source of unit operational problems. The dual 7-seg-
ment LED display will display an error code that may contain a
letter and number. The error code may be used to assist in
troubleshooting the unit.
RESETTING FROM LOCKOUT
Furnace lockout results when a furnace is unable to achieve
ignition after three attempts during a single call for heat. It is
characterized by a non-functioning furnace and a E 0 code dis-
played on the dual 7-segment display. If the furnace is in “lock-
out”, it will (or can be) reset in any of the following ways.
1. Automatic reset. The integrated control module will auto-
matically reset itself and attempt to resume normal opera-
tions following a one hour lockout period.
2. Manual power interruption. Interrupt 115 volt power to
the furnace.
3. Manual thermostat cycle. Lower the thermostat so that
there is no longer a call for heat for 1 -20 seconds then
reset to previous setting.
NOTE: If the condition which originally caused the lockout still
exists, the control will return to lockout. Refer to the
Troubleshooting Codes for aid in determining the cause.