Troubleshooting
WARNING: Turn off heater and let cool before ser- vicing. Only a qualified service person should service and repair heater.
Note: All troubleshooting items are listed in order of operation.
CAUTION: Never use a wire, needle, or similar object
to clean pilot. This can damage pilot unit.
| OBSERVED PROBLEM | POSSIBLE CAUSE | REMEDY | ||||
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| When ignitor button is pressed, there is no | 1. | Ignitor electrode not connected to ignitor | 1. | Reconnect ignitor cable | ||
| spark at pilot | 2. | cable | 2. | Free ignitor cable if pinched by any | ||
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| Ignitor cable pinched or wet | |||||
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| 3. | Piezo ignitor nut is loose | 3. | metal or tubing. Keep ignitor cable dry | ||
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| Tighten nut holding piezo ignitor. Nut is | |||||
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| 4. | Broken ignitor cable | 4. | located behind the mounting bracket | ||
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| Replace ignitor cable | |||||
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| 5. | Bad piezo ignitor | 5. | Replace piezo ignitor | ||
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| 6. | Ignitor electrode broken | 6. | Replace pilot assembly | ||
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| 7. | Ignitor electrode positioned wrong | 7. | Replace pilot assembly | ||
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| When ignitor button is pressed, there is spark | 1. | Gas supply turned off or equipment | 1. | Turn on gas supply or open equipment | ||
| at pilot but no ignition | 2. | shutoff valve closed | 2. | shutoff valve | ||
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| Gas control knob not in PILOT posi- | Turn gas control knob to PILOT posi- | ||||
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| 3. | tion | 3. | tion | ||
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| Gas control knob not pressed in while in | Press in gas control knob while in PILOT | ||||
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| 4. | PILOT position | 4. | position | ||
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| Air in gas lines when installed | Continue holding down control knob. | ||||
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| Repeat igniting operation until air is | ||
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| 5. | Depleted gas supply (propane/LP models | 5. | removed | ||
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| Contact local propane/LP gas company | |||||
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| 6. | only) | 6. | Clean pilot (see Cleaning and Mainte- | ||
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| Pilot is clogged | |||||
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| 7. | Gas regulator setting is not correct | 7. | nance, page 26) or replace pilot assembly | ||
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| 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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| 3. | enough | 3. | pressed in 30 seconds | ||
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| Equipment shutoff valve not fully open | Fully open equipment shutoff valve | ||||
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| 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 Main- | ||
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| lem could be caused by one or both of |
| tenance, page 26) or replace pilot as- | ||
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| the following: |
| sembly | ||
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| A) Low gas pressure |
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| 5. | B) Dirty or partially clogged pilot | 5. | Hand tighten until snug, then tighten 1/4 | ||
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| Thermocouple connection loose at con- | |||||
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| 6. | trol valve | 6. | turn more | ||
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| Thermocouple damaged | Replace pilot assembly | ||||
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| 7. | Control valve damaged | 7. | Replace control valve | ||
www.desatech.com | 27 |