Table of Contents
Advertisement
1 Stage Troubleshooting Codes
Symptom
Normal operation
Furnace fails to operate
Furnace fails to operate
Induced draft blower runs
continuously with no furnace
operation
Circulator blower runs
continuously
No furnace operation
Induced draft blower and
circulator blower runs
continuously
No furnace operation
No furnace operation
To View & Clear Fault Codes
•
Press either the Left or Right switch until L 6 F is displayed.
•
Press the center switch to view stored faults.
•
Press and hold the center switch for 5 to 30 seconds.
•
All stored faults will be erased, and the display will flash - - - three times and return to L 6 F.
TROUBLESHOOTING CHART
LED
Fault Description
Status
Normal operation
Furnace lockout due to an excessive number
of ignition "retries" (3 total)
Failure to establish flame
Loss of flame after establishment
Pressure switch circuit is closed at start of
heating cycle
Pressure switch contacts sticking
Short in pressure switch circuit wiring
Pressure switch circuit is not closed
Pressure switch hose blocked pinched, or
connected improperly
Blocked flue and/or inlet air pipe, blocked
drain system or weak induced draft blower
Incorrect pressure switch set point or
malfunctioning switch contacts
Loose or improperly connected wiring
Primary limit circuit is open
Insufficient conditioned air over the heat
exchanger
Blocked filters, restrictive ductwork, improper
circulator blower speed, or failed circulator
blower motor
Loose or improperly connected wiring in high
limit circuit
Flame sensed with no call for heat
Short to ground in flame sense circuit
Lingering burner flame Slow closing gas
valve
Open fuse
Short in low voltage wiring
Locate and correct gas interruption
Check flame sense signal, clean sensor if coated or
Check flue piping for blockage, proper length, elbows, and
Verify proper induced draft blower performance
Replace low stage pressure switch Repair short in wiring
Inspect pressure switch hose, repair/replace if necessary
Inspect flue piping for blockage, proper
length, elbows, and termination
Check induced draft blower performance, correct as
Check pressure switch operation, replace as needed
Tighten or correct wiring connection
Check filters and ductwork for blockage Clean filters or
Check circulator blower speed and performance
Correct speed or replace blower motor if necessary
Tighten or correct wiring connection
Correct short at flame sensor or in flame sensor wiring
Check for lingering or lazy flame Verify proper operation of
Locate and correct short in low voltage wiring
43
Corrective Actions
None
Replace or realign igniter
oxidized
termination
necessary
remove obstruction
gas valve
Replace fuse
Advertisement
Table of Contents
