DESA INTERNATIONAL
UNVENTED NATURAL GAS LOG HEATER
TROUBLESHOOTING
Continued
OBSERVED PROBLEM | POSSIBLE CAUSE | REMEDY | |||
One or both burners do not light after ODS/ | 1. | Inlet gas pressure is too low | 1. | Contact local natural gas company | |
pilot is lit | 2. | Burner orifice(s) clogged | 2. | Clean burner(s) (see Cleaning and Main- | |
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| tenance, page 18) or replace burner | |
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| orifice(s) | |
| 3. | Mislocated crossover tube | 3. | Contact qualified service person | |
| 4. | Burner orifice(s) diameter is too small | 4. | Replace burner orifice(s) | |
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Delayed ignition of one or both burners | 1. | Manifold pressure is too low | 1. | Contact local natural gas company | |
| 2. | Burner orifice(s) clogged | 2. | Clean burner(s) (see Cleaning and Main- | |
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| tenance, page 18) or replace burner | |
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| orifice(s) | |
| 3. | Mislocated crossover tube | 3. | Contact qualified service person | |
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Burner backfiring during combustion | 1. | Burner orifice is clogged or damaged | 1. | Clean burner (see Cleaning and Main- | |
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| tenance, page 18) or replace burner | |
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| orifice | |
| 2. | Damaged burner | 2. | Replace damaged burner | |
| 3. | Gas regulator defective | 3. | Replace gas regulator | |
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Yellow flame in front burner during burner | 1. | Not enough air | 1. | Check burner(s) for dirt and debris. If | |
combustion |
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| found, clean burner(s) (see Cleaning and | |
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| Maintenance, page 18) | |
| 2. | Gas regulator defective | 2. | Replace gas regulator | |
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Slight smoke or odor during initial operation 1. Residues from manufacturing processes and logs curing
1.Problem will stop after a few hours of operation
Heater produces a whistling noise when | 1. | Turning control knob to HI position | 1. | Turn control knob to LO position and |
burners are lit |
| when burners are cold |
| let warm up for a minute |
| 2. | Air in gas line | 2. | Operate burners until air is removed |
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| from line. Have gas line checked by lo- |
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| cal natural gas company |
| 3. | Air passageways on heater blocked | 3. | Observe minimum installation clear- |
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| ances (see pages 7 through 9) |
| 4. | Dirty or partially clogged burner | 4. | Clean burners (see Cleaning and Main- |
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| orifice(s) |
| tenance, page 18) or replace burner |
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| orifice(s) |
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Moisture/condensation noticed on windows | 1. | Not enough combustion/ventilation air | 1. | Refer to Air for Combustion and Venti- |
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| lation requirements (page 4) |
White powder residue forming within burner box or on adjacent walls or furniture
1.When heated, vapors from furniture pol- ish, wax, carpet cleaners, etc. turn into white powder residue
1.Turn heater off when using furniture polish, wax, carpet cleaners, or similar products
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