furnace dose not light
I have aatwood 8500 IV that wont light light off , 3 red light indicat ignition lockout fault,what should I check or replace
Forum Discussion
Ignitor lock-out.
After 3 attempts to lite off it will go to lock-out.
Low gas pressure...should be 11" WC with at least 50% of other gas appliances in service
Blocked exhaust...creates an imbalance in air/fuel ratio
Spark electrode dirty/out of position......clean electrode with emery cloth/set spark gap to 1/8"
Spark electrode wire bad
Circuit board....bad connection/contacts on board (pull connector/clean contact surface with pencil eraser) OR the board is bad
Clean up the spark electrode and board contacts and check ground connections on furnace
After 3 attempts to lite off it will go to lock-out.
Low gas pressure...should be 11" WC with at least 50% of other gas appliances in service
Blocked exhaust...creates an imbalance in air/fuel ratio
Spark electrode dirty/out of position......clean electrode with emery cloth/set spark gap to 1/8"
Spark electrode wire bad
Circuit board....bad connection/contacts on board (pull connector/clean contact surface with pencil eraser) OR the board is bad
Clean up the spark electrode and board contacts and check ground connections on furnace
