Lockout 109 Ignition failed

What the control is telling you

Burner did not prove flame during the ignition attempts. After all attempts fail the control shows Hold 110.

Applies to: Trinity Tft60, Tft85, Tft110, Tft154, Tft201, Tft285, Tft340, Tft399

Likely causes

• Spark igniter gap wrong or igniter faulty
• Spark cable off the spark generator or igniter, or green ground wire off the 1/4 in tab
• Blocked exhaust, air inlet, blower, gas valve venturi or heat exchanger
• Blocked condensate drain
• Manual gas valve closed or low gas line pressure
• Flame rod signal wire disconnected
• No 120 VAC reaching the spark generator
• Spark generator dead
• No 24 VAC reaching the gas valve during trial for ignition
• Gas valve not opening

Test and repair steps

1. Check the electrode gap 3/16 to 1/4 in
2. Make sure the high-voltage spark cable is tight at the generator and the igniter electrode, and the green ground wire is on the 1/4 in quick-connect tab
3. Check exhaust, air inlet, blower, venturi and heat exchanger for blockage
4. Clean the condensate trap and inspect the drain for blockage or build-up
5. Open the manual gas valve and verify line pressure against the gas valve section
6. Confirm the flame rod signal wire is seated at the rod and at the control
7. During trial for ignition measure 120 VAC between J5-6 and ground on the control
8. Watch for an arc through the observation port next to the spark electrode in the burner door; with 120 VAC present and no arc, replace the spark generator
9. During trial for ignition measure 24 VAC between J5-2 and J4-10; replace the control if absent
10. Listen for the gas valve click on and off; if the control supplies 24 VAC and wiring is good, test whether the valve responds

Models that show this code

13 models in Trinity Tft

Other codes on the same units

• Lockout 107 Flame lost early in run
• Lockout 108 Flame lost in run
• Lockout 108 Flame lost in run
• Lockout 109 Ignition failed
• Lockout 11 Internal fault: Invalid Burner control state flag
• Lockout 11 Internal fault: Invalid Burner control state flag
• Lockout 112 Pilot test flame timeout
• Lockout 112 Pilot test flame timeout