Ignition failed through 5 attempts.
1. If no ignition spark occurs:
Check ignition electrode cable, electrode connector, and connections.
Inspect ignition electrode cable and electrode for insulation damage.
Check ground lead from ground terminal strip to heat exchanger access cover.
2. If spark occurs, but no flame:
Verify manual gas valve in boiler is open.
Verify plastic line from gas valve to air inlet elbow is connected to gas valve and elbow, and line is unobstructed with no kinks.
Check incoming gas pressure.
Verify gas lines are free of obstruction and purge gas lines of air if necessary.
Verify flue gas vent and air supply piping are correctly installed, in good condition, and free of obstructions.
Check voltage to gas valve (approx. 19-21 VDC (24 vrac) during ignition attempt).
Check gas meter to verify gas flows when gas valve is activated.
Remove and inspect/clean ignition electrode. Clean white oxides if necessary and replace ignition electrode if in poor condition or unable to be cleaned.
Disconnect gas valve from Venturi. Inspect Venturi gas line to verify there are no obstructions. Replace gas valve.
Check for possible flue gas recirculation at vent/air terminations or inside boiler housing.
If gas valve is powered, gas flows when activated, and above steps have been verified, replace gas valve and retry.
3. Flame occurs but flame signal too low (less than 3 vdc between X1-5 and ground):
Inspect flame at both low and high fire rates. Inspect and clean burner if necessary.
Replace burner if not in good condition.
Check gas flow rate at gas meter with boiler at high fire. If input is not within about 10% of boiler rating, replace gas valve. (Length of the vent/air piping will affect boiler firing rate, with longer piping causing lower inputs.)
Check ground wire and connections from ground terminal screw to X1-6 terminal on wiring harness. Use ground continuity meter to verify good ground path.
Follow procedure to inspect and clean ignition electrode. Replace ignition electrode if necessary.
If above does not correct problem, replace control module.
