Technical information

22
Servicing should only be performed by a Qualied Service Technician
IGNITION CONTROL BOARD DIAGNOSTIC LED INTERPRETATION AND
TROUBLESHOOTING
CONDITIONS:
• Power On.
• Red, heater control “Call for Heat” LED – on.
• Red, ignition control board diagnostic LED – Flashing.
• Note LED Flash Code before resetting heater.
LED Status Indication
1 Flash System is in lock out.
2 Flashes Draft proving (pressure) switch failed to open within 5 seconds at
the end of the last cycle.
3 Flashes Draft proving (pressure) switch failed to close within 5 seconds
after the inducer was started. The low gas pressure switch (closes
at 5.2" ± 0.4" W. C.) may have remained open (Natural Gas only).
4 Flashes Open on high temperature limit switch (ECO).
5 Flashes Not used.
6 Flashes 115-volt supply power connection is indicating reversed polarity.
7 Flashes Flame sensor reads a low flame signal for more than 4.25 sec.
8 Flashes No ignition sensed.
Continuous Flash Continuous flame sensed for more than 5 seconds without gas
valve being energized.
Continuous ON Internal control board failure.