5 Electrical connections
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 front of the unit.
Installation & Service Manual
TABLE 5E
Status LED Diagnostic Codes
Code
Condition Lights
Sequence
TABLE 5D
Status LED Diagnostic Codes
Code
Condition
Prepurge
Trial for
Operation for combustion air fan before ignition on stages 1 and 2.
Sequence
Constant
Ignition
Hot surface igniter preparing to light burners.
ON
System OK, no faults present.
Stage 1 ON Burners for stage 1 operating.
Possible control fault, check power; LED may Constant be defective, do not replace control if all
OFF operational sequences function properly, see Trouble- Shooting Guide.
Stage 2 ON
Burners for stage 2 operating.
Low Air, check air pressure switch and hoses
One to pressure sensing points, fan, venting and
Flash sealing of pressurized chamber. Note: Brief flashing normal on fan
Flame without call for heat, check for a gas
Two valve stuck in the open position, air, venting, Flashes burners and the combustion process. Fan will
remain on.
Lockout due to flame failure, push reset button on the diagnostic panel after correcting
Three ignition problem. Initial heater start up Flashes without properly bleeding air from the gas line may require multiple reset functions to
achieve proper ignition.
Igniter failure, igniter will not maintain a
Four minimum 2.75 amp current draw, caused Flashes by low voltage, bad wiring/continuity, high
resistance or igniter failure.
Five Power supply problem, check for low supply Flashes voltage or transformer output less than 18VAC.
Six
Replace ignition module, internal fault.
Flashes
Status Remote status light for ignition module.
Indicates flame failure on the ignition module
Alarm and will indicate additional alarms if the alarm
of any failure option is purchased.
Figure 5-13_Operation / diagnostic lights
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