TROUBLESHOOTING
19
DM80SN*U
DM80SN*U
Symptom
LED Status
Fault Description
Corrective Actions
Furnace fails to operate
Polarity of 115 volt AC is reversed
Poor unit ground
Correct polarity, check and correct wiring if necessary
Verify proper ground, correct if necessary
Furnace fails to operate
Gas valve is energized when it should not be
Internal gas valve error
Check wiring in gas valve circuit
Replace integrated control board
Furnace fails to operate
Gas valve is not energized when it should be
External Gas Valve Error
Check wiring in gas valve circuit
Replace integrated control board
Furnace fails to operate
Auxiliary limit switch (blower compartment)
circuit is open
Furnace power was turned off during heat cycle
Blower not operating during heat
Faulty aux limit or wiring
Furnace fails to operate
Grounding Error
Check grounding
Furnace fails to operate
Burner limit switch circuit is open
Check and correct gas supply pressure
Check flue and air inlet for blockage, proper length, elbows, and
termination
Check wiring connection in limit circuit
Check burner temperature switch, replace if necessary
Furnace fails to operate
Redundant relay open alarm
Replace integrated control board
Furnace fails to operate
Redundant relay stuck closed alarm
Replace integrated control board
Furnace fails to operate
Inducer communication alarm
Check Red, Black, White harness & connections to inducer &
control board
Furnace fails to operate
APS reference error
Check Red, Black, Green harness & connections to pressure
sensor & control board
Replace pressure sensor
Furnace fails to operate
APS null error
Check Red, Black, Green harness & connections to pressure
sensor & control board
Check pressure hoses to pressure sensor and pressure switch
Furnace fails to operate
APS span error
Check Red, Black, Green harness & connections to pressure
sensor & control board
Check pressure hoses to pressure sensor and pressure switch
Furnace fails to operate
APS pressure error
Check Red, Black, Green harness & connections to pressure
sensor & control board
Replace pressure sensor
Furnace fails to operate
APS input error
Check Red, Black, Green harness & connections to pressure
sensor & control board
Replace pressure sensor
Twinning error
Furnace fails to operate
Low circulator current
Check motor 120V line wire is connected to terminal inside
current transformer loop
Check wire connections to motor and PCB
Furnace fails to operate
Circulator current unexpected
Check motor 120V line wire is connected to terminal inside
current transformer loop
Furnace fails to operate
No shared data
Populate shared data set using memory card
Summary of Contents for DM80SE
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Page 16: ...TROUBLESHOOTING 16 DM80SE U...
