TROUBLE SHOOTING GUIDE
(for qualified serviceman)
SYMPTOM |
| POSSIBLE CAUSES | CORRECTIVE ACTION | |
No spark at ODS1. | Ignitor wire off ODS or Piezo. | 1. Check and | ||
| 2. | Ignitor wire shorting out on casing. | 2. Move ignitor wire. | |
| 3. | Defective piezo ignitor. | 3. Replace Piezo ignitor. | |
| 4. | Wrong gap from electrode. | 4. | Set gap at 3/16”. |
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Spark but no ignition | 1. | No gas to heater. | 1. | Check and turn on gas. |
at ODS | 2. | Air in gas line. | 2. | Hold in pilot knob to bleed air from gas line. |
| 3. | Blocked ODS orifice. | 3. | Blow out ODS with low pressure air hose. |
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ODS will not remain | 1. | Safety interlock system activated. | 1. | Wait five minutes between |
lit when control |
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| attempts. |
knob is released | 2. | Control knob not held in long | 2. | Press in control knob, light ODS and hold |
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| enough. |
| control knob in for one minute. |
| 3. | Control knob not in “PILOT” | 3. | Turn control knob to “OFF” then without |
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| position. |
| pushing down turn knob counterclockwise |
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| until knob stops turning. Push |
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| knob down completely at this point. |
| 4. | Thermocouple loose. | 4. | Tighten thermocouple into gas valve. |
| 5. | Defective thermocouple. | 5. Replace thermocouple (hand tighten plus | |
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| 1/4 turn with wrrench). |
| 6. | Defective gas valve. | 6. | Replace gas valve. |
| 7. | Air in line. | 7. | Bleed all air from gas line. |
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ODS lights but main | 1. Control knob not in “ON” position. | 1. | Turn control knob to “ON”. | |
burner does not | 2. Burner orifice blocked. | 2. Clean burner orifice with low pressure | ||
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| air hose. |
| 3. | Gas supply pressure low. | 3. | Check supply pressure. Call gas supplier. |
| 4. | Weak thermocouple. | 4. Replace thermocouple. | |
| 5. | Defective gas valve. | 5. | Replace gas valve. |
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Delayed ignition | 1. | Low gas supply pressure. | 1. | Check supply pressure. Call gas supplier. |
| 2. | Burner orifice blocked at ODS. | 2. Clean burner orifice with low pressure | |
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| air hose. |
| 3. | Low manifold pressure. | 3. Check and replace regulator if necessary. | |
| 4. | ODS not in correct location. | 4. | Make sure ODS is properly mounted to |
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| burner bracket. |
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Flashback | 1. | Broken or defective plaque. | 1. | Discontinue use and replace burner assembly. |
| 2. | Gas supply pressure low. | 2. | Check supply pressure. Call gas supplier. |
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One or more plaques | 1. Burner orifice blocked. | 1. Clean burner orifice with low pressure | ||
not glowing |
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| air hose. |
| 2. | Broken or defective plaque. | 2. | Discontinue use and replace burner assembly. |
| 3. | Low gas supply pressure. | 3. | Check supply pressure. Call gas supplier. |
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Heater shuts off during | 1. Blocked ODS. | 1. | Clean ODS. See maintenance section. | |
normal operation | 2. | Low gas supply presure. | 2. | Check supply pressure. Call gas supplier. |
| 3. | Not an adequate supply of | 3. | See “Provisions for adequate combustion |
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| combustion and ventilation air. |
| and ventilation air” on Page 3 of |
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| instructions. |
| 4. | Heater located in drafty area. | 4. | |
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