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TROUBLESHOOTING
TROUBLESHOOTING
Note: For additional help, visit DESA’s technical service web site at www.desatech.com.
Note: All troubleshooting items are listed in order of operation.
WARNING: Turn off heater and let cool before servicing. Only a quali- fied service person should service and repair heater.
CAUTION: Never use a wire, needle, or similar object to clean pilot. This can damage pilot unit.
OBSERVED PROBLEM | POSSIBLE CAUSE | REMEDY |
When ignitor button is pressed, there is no spark at pilot
1.Ignitor electrode not connected to igni- tor cable
2.Ignitor cable pinched or wet
3.Piezo ignitor nut is loose
4.Broken ignitor cable
5.Bad piezo ignitor
6.Ignitor electrode broken
7.Ignitor electrode positioned wrong
1.Reconnect ignitor cable
2.Free ignitor cable if pinched by any metal or tubing. Keep ignitor cable dry
3.Tighten nut holding piezo ignitor. Nut is located behind the mounting bracket
4.Replace ignitor cable
5.Replace piezo ignitor
6.Replace pilot assembly
7.Replace pilot assembly
When ignitor button is pressed, there is | 1. | Gas supply turned off or equipment | 1. | Turn on gas supply or open equipment |
spark at pilot but no ignition |
| shutoff valve closed |
| shutoff valve |
| 2. | Gas control knob not in PILOT position | 2. | Turn gas control knob to PILOT position |
| 3. | Gas control knob not pressed in while | 3. | Press in gas control knob while in PILOT |
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| in PILOT position |
| position |
| 4. | Air in gas lines when installed | 4. | Continue holding down control knob. |
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| Repeat igniting operation until air is re- |
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| moved |
| 5. | Depleted gas supply (propane/LP models | 5. | Contact local propane/LP gas company |
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| only) |
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| 6. | Pilot is clogged | 6. | Clean pilot (see Cleaning and Mainte- |
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| nance, page 27) or replace pilot assembly |
| 7. | Gas regulator setting is not correct | 7. | Replace gas control |
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Pilot lights but flame goes out when control | 1. | Gas control knob not fully pressed in | 1. | Press in gas control knob fully |
knob is released | 2. | Gas control knob not pressed in long | 2. | After pilot lights, keep gas control knob |
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| enough |
| pressed in 30 seconds |
| 3. | Equipment shutoff valve not fully open | 3. | Fully open equipment shutoff valve |
| 4. | Pilot flame not touching thermocouple, | 4. | A) Contact local natural or propane/LP |
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| which allows thermocouple to cool, |
| gas company |
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| causing pilot flame to go out. This prob- |
| B) Clean pilot (see Cleaning and |
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| lem could be caused by one or both of |
| Maintenance, page 27) or replace pi- |
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| the following: |
| lot assembly |
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| A) Low gas pressure |
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| B) Dirty or partially clogged pilot |
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| 5. | Thermocouple connection loose at con- | 5. | Hand tighten until snug, then tighten |
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| trol valve |
| 1/4 turn more |
| 6. | Thermocouple damaged | 6. | Replace pilot assembly |
| 7. | Control valve damaged | 7. | Replace control valve |
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