Burner Troubleshooting
SYMPTOM | CAUSE | REMEDY |
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Loud, | Flame is too rich. | Verify pressure tap between gas valve |
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| and blower inlet. |
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| Turn to Page 19 and verify that the gas |
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| regulator setting is 0.2”wc below the |
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| blower inlet pressure. |
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| Replace gas orifice with smaller size. |
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Flame is “fluttery.” | Flame is too lean. | Turn to Page 19 and verify that the gas |
Exhaust may have acrid |
| regulator setting is 0.2”wc below the |
smell or burner may fail |
| blower inlet pressure. |
to stay lit. |
| Replace gas orifice with larger size. |
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Burner pulsates or | Exhaust vent is too long. | Reduce length of exhaust vent and/or |
surges, especially on |
| number of elbows. |
ignition. |
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Combustion appears | Flame current is not | Check for wet or damaged igniter with |
normal, but flame does | being sensed. | low resistance to ground. Replace with |
not stay lit. |
| new igniter. |
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| Verify burner flameholder is properly |
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| grounded. |
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| Replace Ignition Control Module. |
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Heat Exchanger Troubleshooting
SYMPTOM | CAUSE | REMEDY | |
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Boiling in heat exchanger. | Low water flow to heater. | Service pump and or filter. | |
May be accompanied by | Heat exchanger plugged. | Service heat exchanger. Correct water | |
“bumping” sounds. | |||
| chemistry. | ||
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| Bypass valve stuck open. | Service bypass valve. | |
| Thermal governor stuck | Replace thermal governor. | |
| closed. |
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Sweating. | Thermal governor failed. | Replace thermal governor. | |
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