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Safety warning about improper installation, adjustment, alteration, service, or maintenance.
Safety warning about disconnecting power before servicing the integrated control.
Describes the SureLight® two-stage, variable speed integrated control and its functions.
Explains the electronic ignition sequence and operation of the integrated control.
Describes errors with unresponsive devices, often related to communication.
Open start circuit for the compressor.
Restricted heat air flow below minimum.
Open run circuit for the compressor.
Compressor contactor is welded.
Low voltage detected for the compressor.
Compressor internal overload tripped.
Incorrect wiring of the gas valve.
Compressor short-cycling due to running less than 4 minutes.
Explains the seven-segment diagnostic LED display for operating status and error codes.
How to access and clear error codes using the diagnostic button.
How to program the unit's capacity and size.
Communication issues between devices on the RSBus.
Control failure due to self-check, internal error, or hardware issues.
Failure of the gas valve second-stage relay.
Various soft lockout conditions related to pressure switches, flame failure, limit circuit, and ignitor.
Restricted airflow in cooling or continuous fan mode.
Covers errors related to line voltage, ground detection, and frequency.
System configuration errors due to corrupted control parameters.
Hot surface ignitor circuit is open.
Mismatch in capacity between indoor and outdoor units.
Fault in the ignitor circuit or its triggering components.
Issues with 24V power supply and grounding.
Issues with low or high pressure switches failing open or closed.
Indoor blower motor unable to start due to obstruction or seized bearings.
Relay Y1 stuck on the integrated control.
Hard lockout caused by an open rollout circuit.
Low pressure switch open during ignition trial or run mode.
Heat rate reduction due to restricted airflow.
No 24V output on Y1 of the integrated control with a non-communicating unit.
Failure in communication between the control and the indoor blower motor.
Soft lockout due to exceeding retry limits with no flame sensed.
Interlock switch sensed open for an extended period.
Critical alert for unprogrammed appliance capacity or size.
Warning about ECM motor energy potentially interfering with pacemakers.
Safety warning to disconnect power and wait for capacitors to discharge.
Steps to verify motor operation.
Describes the flame rollout switches and their function.
Details the primary limit control and its function.
Describes the dual combustion air pressure switch and its function.
Danger of explosion due to PVC glue fumes.
Hazard warning regarding carbon monoxide poisoning from improper venting.
Caution regarding negative pressure in spaces when sizing inlet air openings.
Safety warning regarding fire or explosion hazards.
Troubleshooting steps if the unit fails to operate.
Important safety note for emergency shutdown procedures.
Important safety note for connecting a shut-off valve to the manometer.
Step-by-step procedure for checking manifold pressure.
Safety warning regarding electrical shock, fire, or explosion hazards during servicing.
Step-by-step instructions for reassembling after heat exchanger cleaning.
Step-by-step instructions for cleaning the burner assembly.
Heating sequence for two-stage thermostat with factory settings.
Caution regarding using properly sized wiring and circuit breakers.
Warning about fire hazard from using aluminum wire.
Warning about electric shock hazard and proper grounding.
Heating sequence for single-stage thermostat with DIP switch 1 ON.
Table mapping unit size codes to furnace models for programming.
Step-by-step guide to programming the unit's capacity and size.
Flowchart detailing the heating sequence of operation.
Flowchart for the second-stage heating sequence.
Flowchart detailing the cooling sequence of operation.
Flowchart for continuous fan operation.
General