Lennox LRP16G Installation Instructions Manual page 19

Ignition Control LED Codes
The ignition control LED flashes codes which indicate
normal or abnormal operations:
LED Status Flashing Rate
One flash per
Slow Flash
second
Two flashes per
Fast Flash
second
Two flashes in
2 Flash second with
1-second pause
Three flashes in
3 Flash 1.5 seconds with
1-second pause
Four flashes in
4 Flash 2 seconds with
1-second pause
Five flashes in
5 Flash 2.5 seconds with
1-second pause
Steady
--
Table 4. Fault Codes
Fault Description
Normal operation:
No call for heat
Normal operation:
Call for heat
System lockout:
Failed to detect or
sustain flame
Pressure switch senses
incorrect pressure or gas
valve coil is open.
High limit or rollout
switch open
Flame sensed and gas
valve not energized
Internal failure:
Micro-controller failure;
self-check
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