GC9C96 Installation Manual





 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
Open fuse Replace fuse
Short in low voltage wiring

voltage wiring






Check inlet air piping for blockage,













replace if necessary
Furnace fails to
operate



 

   

Furnace fails to
operate

Replace low stage pressure switch
Repair short in wiring

operation








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
No furnace
operation

Furnace fails to
operate







 Corrective Actions

  None

   


contacts sticking
Shorts in pressure switch
circuit wiring
Repair short in 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


Furnace fails to
operate


Poor neutral connection
Verify neutral wire connection to

source
Furnace fails to
operate
 Open roll out switch
Check for correct gas pressure


restriction
Furnace fails to
operate
 Ignitor Open


Furnace fails to
operate

 
Twinning feature
not working
 


Furnace fails to
operate

 


Furnace fails to
operate on high


on low stage

blower operating




  

blower operating
Furnace fails to
operate

Furnace fails to
operate

Furnace fails to
operate





no signal

