Troubleshooting
Note: Before troubleshooting the system, make sure the gas shutoff valve is ON. The two most common causes of a malfunctioning gas appliance are:
1.Loose wiring connections
2.Construction debris clogging the pilot and/or gas control valve filter
OBSERVED PROBLEM | POSSIBLE CAUSE | REMEDY | ||
Ignitor will not spark or pilot will | 1. No gas supply or shutoff | 1. | Check to see if you have gas | |
not light |
| valve is OFF |
| supply and that equipment |
| 2. | Air in gas line | 2. | shutoff valve is opened |
| Repeat lighting procedure sev- | |||
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| eral times to purge all air out of |
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| lines. If after repeated attempts |
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| appliance does not light, call for |
| 3. | Construction debris clog- | 3. | qualified service and repair. |
| Remove debris and dirt, in- | |||
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| ging pilot orifice |
| spect and clean any other |
| 4. | Low gas pressure | 4. | possible obstructions |
| Contact your gas supplier to | |||
| 5. | Kinked pilot line | 5. | check pressure |
| Have a qualified technician | |||
| 6. | Control valve knob is not | 6. | replace pilot line |
| Replace control valve (Refer to | |||
| 7. | opening | 7. | Replacement Parts, page 20) |
| No power to unit or the | Check that main power is on | ||
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| ignition module or power |
| and that all wire connections |
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| transformer is bad |
| are made correctly to the |
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| ignition model (see Wiring |
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| Diagram, page 21). Check for |
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| 24 VAC at the secondary side |
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| of the transformer. If 24 VAC |
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| is present and the module does |
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| not operate, have the module |
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| replaced otherwise have the |
| 8. | Vent damper not fully open | 8. | transformer replaced |
| Open vent damper until fully | |||
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| locked in OPEN position |
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Pilot will not stay lit | 1. Loose wiring on ignitor wire | 1. | Check wiring connection. | |
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| to ignition module and/or poor |
| Refer to wiring diagram (see |
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| ground to ignition module |
| Wiring Diagram, page 21) |
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| and/or check ground wire to |
| 2. | Pilot flame too low to sense | 2. | ignition module |
| Clean and adjust pilot burner | |||
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| and check gas supply and inlet |
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| pressure to unit |
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| Note: Have a qualified technician | |
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| replace pilot assembly if broken | |
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| or corroded | |
No gas to burner, although wall | 1. Wall switch wires defective or | 1. | Check electrical connections | |
switch and valve are set to the |
| too long | 2. | Recheck problems 1 and 2 |
ON position | 2. Thermopile not generating | |||
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| sufficient voltage |
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22 | www.desatech.com |
