Corrective Actions
None
Check front cover pressure switch
(hose, wiring, contact operation),
correct if necessary
Replace or realign igniter
Check flue piping for blockage,
heating cycle
contacts sticking
Short in pressure switch circuit
wiring
blockage, proper length, elbows,
necessary
Incorrect pressure switch set
contacts
Check pressure switch operation,
wiring
Tighten or correct wiring connection
obstruction
Tighten or correct wiring connection
heat
circuit
closing gas valve
Short in low voltage wiring
voltage wiring
Check inlet air piping for blockage,
replace if necessary
Replace low stage pressure switch
Repair short in wiring
blower runs
continuously with
no furnace
operation
Inspect pressure switch hose,
repair/replace if necessary
Circulator blower
runs continuously
No furnace
operation
circulator blower
runs continuously
No furnace
operation
Verify proper operation of gas valve
Corrective Actions
None
contacts sticking
Shorts in pressure switch
circuit wiring
Furnace fails to
operate on high
on low stage
Inspect pressure switch hose,
repair/replace if necessary
blockage, proper length, elbows,
necessary
Tighten or correct wiring connection
Polarity of 115 volt AC is
wiring if necessary
necessary
Check wiring in gas valve circuit
Check wiring in gas valve circuit
Internal gas valve error
Furnace fails to
No 115 power to furnace or no
Restore high voltage power to
breaker
fuse to open, replace fuse
non- functional
Poor neutral connection
Verify neutral wire connection to
source
Check for correct gas pressure
restriction
Twinning feature
not working
Furnace fails to
operate on high
on low stage
blower operating
blower operating
no signal
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