TROUBLESHOOTING
Continued
OBSERVED PROBLEM | POSSIBLE CAUSE | REMEDY | |||
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ODS/pilot lights but flame | 1. Control knob not fully pressed in | 1. | Press in control knob fully | ||
goes out when control knob is | 2. Control knob not pressed in | 2. After ODS/pilot lights, keep con- | |||
released | 3. | long enough | 3. | trol knob pressed in 30 seconds | |
| Equipment shutoff valve not | Fully open equipment shutoff | |||
| 4. | fully open | 4. | valve | |
| Thermocouple connection | Hand tighten until snug, then | |||
| 5. | loose at control valve | 5. | tighten 1/4 turn more | |
| Pilot flame not touching ther- | A) Contact local natural or | |||
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| mocouple, which allows ther- |
| propane/LP gas company | |
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| mocouple to cool, causing |
| B) Clean ODS/pilot (see | |
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| pilot flame to go out. This |
| Cleaning and Maintenance, | |
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| problem could be caused by |
| page 15) or replace ODS/pilot | |
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| one or both of the following: |
| assembly | |
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| A) Low gas pressure |
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| B) Dirty or partially clogged |
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| 6. | ODS/pilot | 6. | Replace pilot assembly | |
| Thermocouple damaged | ||||
| 7. | Control valve damaged | 7. | Replace control valve | |
| 8. | Safety interlock system has | 8. | Wait one minute for safety in- | |
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| been triggered (thermostat |
| terlock system to reset. Repeat | |
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| models only) |
| ignition operation | |
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Burner(s) does not light after | 1. Burner orifice(s) is clogged | 1. | Clean burner orifice(s) (see | ||
ODS/pilot is lit |
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| Cleaning and Maintenance, | |
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| page 15) or replace burner | |
| 2. | Inlet gas pressure is too low | 2. | orifice(s) | |
| Contact local natural or pro- | ||||
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| pane/LP gas company | |
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Delayed ignition of burner(s) | 1. Manifold pressure is too low | 1. | Contact local natural or pro- | ||
| 2. | Burner orifice(s) is clogged | 2. | pane/LP gas company | |
| Clean burner orifice(s) (see | ||||
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| Cleaning and Maintenance, | |
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| page 15) or replace burner | |
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| orifice(s) | |
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Burner backfiring during com- | 1. Burner orifice(s) is clogged or | 1. | Clean burner orifice(s) (see | ||
bustion |
| damaged |
| Cleaning and Maintenance, | |
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| page 15) or replace burner | |
| 2. | Burner damaged | 2. | orifice(s) | |
| Replace burner | ||||
| 3. | Gas regulator defective | 3. | Replace gas regulator | |
www.desatech.com | 17 |
