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) |
| 5. | Remote selector in OFF position | 5. | Put remote selector in ON position |
| 6. | Wire disconnected from gas control | 6. | See Wiring Diagram, page 22 |
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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 Mainte- |
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| nance, page 18) or replace burner orifice |
| 2. | Damaged burner | 2. | Replace damaged burner |
| 3. | Gas control defective | 3. | Replace gas control |
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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 control defective | 2. | Replace gas control |
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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
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 (pages 4 through 6) |
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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 orifice(s) | 4. | Clean burners (see Cleaning and Main- |
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| tenance, page 18) or replace burner |
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| orifice(s) |
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White powder residue forming within burner | 1. | When heated, vapors from furniture pol- | 1. | Turn heater off when using furniture |
box or on adjacent walls or furniture |
| ish, wax, carpet cleaners, etc. turn into |
| polish, wax, carpet cleaners, or similar |
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| white powder residue |
| products |
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Remote does not function | 1. | Battery is not installed. Battery power | 1. | Replace |
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| is low |
| remote control |
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