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Defines signal words DANGER, WARNING, and CAUTION for hazard identification.
Warns of severe consequences from electrical shock, fire, or explosion during operation.
Warns of fire or explosion hazards from storing flammables near the furnace.
Illustrates various furnace installation orientations (upflow, downflow, horizontal).
Caution about potential damage to furnace components from electrostatic discharge.
Steps to prevent electrostatic discharge during furnace servicing.
Warning to disconnect power before performing maintenance to prevent electrical shock.
Warning to use care and wear protective gear due to sharp metal edges.
Instructions for cleaning or replacing the furnace air filter.
Notes that blower and inducer motors are pre-lubricated and require no additional lubrication.
Steps involved in removing the blower assembly from the furnace for maintenance.
Caution that dropping or bending the blower wheel can affect its balance.
Caution that improper heating speed selection can shorten heat exchanger life.
Warning about electrical shock when manually closing the blower access panel door switch.
Caution that wiring errors can cause furnace component damage.
Warning about electrical shock if igniter wires are not securely placed.
Warning about fire, explosion, and unit damage related to gas valve orientation.
Warning about fire or explosion hazards during gas leak testing.
Procedure for cleaning the primary heat exchangers.
Note that secondary heat exchangers cannot be serviced or inspected.
Warning against using sharp objects on secondary heat exchangers during cleaning.
Warning against using sharp objects to clean collector box or secondary heat exchangers.
Warning about fire or explosion hazards during gas leak testing.
Warning about burn hazard from hot igniter surfaces.
Caution that the igniter is fragile and can be easily damaged.
Warning about electrical shock if igniter wires are not securely placed.
Warning about electrical shock hazard from multiple electrical supplies.
Checks heat tape for physical damage and power supply.
Warning about furnace component failure or property damage from improper operation.
Warning that freezing condensate can damage the furnace.
Warning against using ethylene glycol as antifreeze.
Explains how to refer to status codes for troubleshooting furnace problems.
Warning about unit damage from limit switch or rollout switch wires contacting metal.
Warning about electrical shock and operational hazards during component testing.
Outlines the sequence of component tests performed by the furnace control.
Lists LED codes and their corresponding status meanings for troubleshooting.
Provides steps to initiate the furnace control component test sequence.
First step in troubleshooting: checking if the LED status light is on.
Checks for the presence of 115V power at the main power input terminals.
Checks if the blower access door switch is properly closed.
Identifies a rapid flashing LED status light indicating potential polarity reversal.
Checks for the presence of 24V power at the control board's secondary terminals.
Verifies if 115V power is reaching the door switch.
Checks for slow blinking LED status lights indicating specific error codes.
Instructs on how to determine the two-digit status code from LED flashes.
Checks if the control board is receiving and responding to thermostat signals.
Inquires about previous status codes to aid in diagnosing intermittent issues.
Tests if the issue persists when bypassing the thermostat signals with a jumper wire.
Explains that no previous status code is stored or has been erased.
Describes blower operation immediately after power-up or during a heat call.
Explains limit circuit lockout due to open switches and auto-reset conditions.
Explains lockout due to repeated ignition failures and auto-reset.
Explains gas heating lockout and checks for gas valve issues.
Describes abnormal flame proving signals and potential causes.
Explains issues when the pressure switch does not open correctly.
Explains issues when the secondary voltage fuse is open.
Explains issues when the pressure switch fails to close or reopen.
Explains limit circuit faults and potential causes like restricted vents or filters.
Explains ignition proving failures and troubleshooting steps.
Explains control circuitry lockout and auto-reset conditions.
Describes available packaged service training programs for increasing product knowledge.
Describes classroom service training for hands-on experience and confidence building.
General
