50
Flame Current
Solder Pads
Figure 46
Limit Fault Codes
If the control detects the high limit circuit open, the RED
LED will flash FOUR times and energize the inducer and
indoor blower.
If the limit circuit opens five times within a single call for
heat, the furnace will go into lockout for one hour. The RED
LED will display a FOUR flash code during this time. The
control board can be reset by cycling 115 volt power to the
furnace.
If the limit circuit opens and does not close within five
minutes, the control assumes the blower has failed the
RED LED will flash ELEVEN times.
If the limit circuit opens and does not close within fifteen
minutes, the control assumes the manual rollout or fuse
has opened and the RED LED will flash FIVE times. The
control will enter a one hour lockout and the inducer will
run continuously.
In an open limit condition the red LED will flash as
described above but the error code will not be stored
in memory until the limit resets or until 15 minutes has
elapsed. So if the limit resets in less than 5 minutes a four
flash code will be stored. If the limit resets in more than
5 but less than 15 minutes, an eleven flash code will be
stored. If the limit is still open after 15 minutes, a five flash
code will be stored.
Diagnostic Chart
Refer to the
Troubleshooting Chart
in the back of this
manual for assistance in determining the source of unit
operational problems.
External Lockout
•
A control lockout resulting from an external fault
sensed by the control, such as an unsuccessful
recycle or retry period, or a limit trip. Once in External
Lockout, the control will shut down for a period of one
hour before attempting another trial for ignition.
Internal Lockout
•
A failure internal to the control board.
Fault Recall
Retrieving Fault Codes
To retrieve fault codes, push and release the “LAST
ERROR” button for more than 1/ 5 second and less than 5
seconds (the LED will indicate this period by solid GREEN
for 1/5 second to 5 seconds). The LED will flash up to five
stored fault codes, beginning with the most recent. If there
are no fault codes in memory, the LED will flash two green
flashes. The control will flash the most recent error first and
the oldest error last. If multiple faults exist there will be 2
seconds between codes. Solid LED error codes will not be
displayed.
