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OPERATION AND DIAGNOSTIC
LIGHTS
The diagnostic control panel has up to 6 indicating and
diagnostic lights to show all major steps of operation and
control sensed malfunctions. This panel is located on the left
end of the unit.
Figure 40 - Operation/Diagnostic Lights
Installation and
Service Manual
35
Code Sequence Condition
Constant ON System OK, no faults present.
Constant OFF Possible control fault, check power;
LED may be effective, do not replace
control if all operational sequences
function properly, see Trouble Shooting
Guide.
One Flash Low Air, check air pressure switch and
hoses to pressure sensing points, fan,
venting and sealing of pressurized
chamber. Note:Brief flashing normal on
fan start-up/proving.
Two Flashes Flame without call for heat, check for a
gas valve stuck in the open position, air,
venting, burners and the combustion
process. Fan will remain on.
Three Flashes Lockout due to flame failure, push reset
button on inner control panel after
correcting ignition problem. Initial heater
start up without properly bleeding air
from the gas line may require multiple
reset functions to achieve proper ignition.
Four Flashes Igniter failure, igniter will not maintain
minimum 2.75 amp current draw, caused
by, low voltage, bad wiring/continuity,
high resistance or igniter failure.
Five Flashes Power supply problem, check for low
supply voltage or transformer output less
than 18VAC.
Six Flashes Replace ignition module, internal
fault.
TA
TABLE - O
Status LED Diagnostic Codes
Code
Sequence Condition Lights
Prepurge Operation of combustion
air fan before ignition on
stages 1 and 2.
Trial for Ignition Hot surface igniter
preparing to light burners.
Stage 1 On Burners for stage 1 operating.
Stage 2 On Burners for stage 2 operating.
(985,000 - 2,065,000 Btu/hr)
Status Remote status light for
ignition module.
Alarm Indicates flame failure on
the ignition module and
will indicate additional
alarms if the alarm of any
failure option is purchased.
TABLE - P
Status LED Diagnostic Codes
Models 985,000 - 2,065,000 Btu/hr
Models 495,000 - 745,000 Btu/hr