Flame lost three times during one demand
1. Check venting for blockages.
2. Check condensate trap from proper draining.
3. Static gas pressure – if insufficient check gas supply-lines and regulator.
4. Gas pressure during ignition – if the static gas pressure is sufficient, check pressure during ignition sequence, i.e. when gas valve opens.
a. If pressure drops below minimum (4” for NG / 8” for LP), check gas supply-line and regulator.
b. If pressure does not move, verify 120VDC at valve during ignition; if no power, check wiring – replace control; if power is present – replace gas valve.
c. If pressure drops slightly – proceed to next step
5. Unit ignites but immediately goes out – check flame sensor (clean or replace) and flame sensor cable, clean combustion chamber, replace control. If a combustion analyzer is available, adjust throttle screw out 1 turn – check/adjust combustion once unit is operational.
6. Unit fails to ignite – check spark electrode and cable (replace). Verify the spark electrode is arcing. WARNING!! – maintain clearance from ignition components while the power is on to avoid risk of severe electrical shock.
7. Unit ignites and runs – check combustion at maximum and minimum modulation rates.
