Table of Contents
Advertisement
1 STAGE TROUBLESHOOTING CODES
Symptom
Normal furnace operation
Furnace fails to operate
Furnace fails to operate
Furnace fails to operate
Furnace fails to operate
Furnace fails to operate.
Integrated control module
LED display provides no
signal
Furnace fails to operate
Furnace fails to operate
Furnace fails to operate
Furnace fails to operate
Twinning feature not working
Furnace fails to operate
TROUBLESHOOTING CHART
LED
Fault Description
Status
Flame sense micro amp signal is minimal
Flame sensor is coated/oxidized
Flame sensor incorrectly positioned in burner
fame
Lazy burner flame due to improper gas
pressure or combustion air
Problem with igniter circuit
Improperly connected or shorted igniter
Poor unit ground
Igniter relay fault on integrated control module
Polarity of 115 volt AC is reversed
Poor unit ground
Gas valve is not energized when it should be
External Gas Valve Error
Gas valve is energized when it should not be
Internal gas valve error
No 115 power to furnace or no 24 volt power
to integrated control module.
None
Blown fuse or tripped circuit breaker
Integrated control module is non- functional
Grounding fault
Poor neutral connection
Open roll out switch
Ignitor Open
Inducer relay Error
TWIN Error
Internal Faults or IRQ Loss in Control Board
Corrective Actions
Clean flame sensor if coated or oxidized Inspect for proper
flame sensor alignment
Compare current gas pressure to rating plate and adjust
as needed
Check and correct wiring from integrated control module to
igniter
Diagnose and replace shorted igniter as needed Verify and
correct unit ground wiring if needed
Check igniter output from control, replace if necessary
Correct polarity, check and correct wiring if necessary
Verify proper ground, correct if necessary
Check wiring in gas valve circuit
Replace integrated control board
Check wiring in gas valve circuit
Replace integrated control board
Restore high voltage power to furnace and integrated
control module.
Correct condition which caused fuse to open, replace fuse
Replace non-functional integrated control module.
Verify neutral wire connection to furnace & continuity to
ground source
Check for correct gas pressure Check for correct burner
alignment
Check for and correct burner restriction
Check for Ignitor wiring.
Replace Damaged Ignitor
Replace integrated control board
Check for wiring connections.
Replace integrated control board
Replace integrated control board
47
Advertisement
Table of Contents
