IF “Ignition Failure”, Ensure main gas supply is in
the ON position. IF ON, go to step 12B. IF NOT,
open gas supply.
Verify gas valve is ON
Verify that the gas valve, inside the heater, is in the
“ON” position. IF correct, go to step 12C. IF NOT,
slide switch to “ON” position.
Inspect main gas supply
Step 12A
Ensure both flame sensor and gas valve are both
securely fastened to the ICB. IF correct, proceed to
step 12D. IF NOT, fasten securely.
Flame sensor & gas valve
48
Ensure gas static, load, and manifold pressures are
correct (Pg. 13). IF OK, go to Step 12E. IF NOT, go to
Step 12F.
Verify gas pressure
Step 12D
Step 12B
12. Service LED ON: “IF” Code
Step 12C
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