Troubleshooting
WARNING: Turn off heater and let cool before servicing. Only a qualified service person should service and repair heater.
CAUTION: Never use a wire, needle or similar object to clean pilot. This can damage pilot unit.
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 | |||
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Ignitor will not spark or pilot | 1. No gas supply or shutoff | 1. | Check to see if you have gas | ||
will 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 clogging | 3. | qualified service and repair. | |
| Remove debris and dirt, in- | ||||
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| 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 is not opening | 6. | replace pilot line | |
| Replace control valve (refer to | ||||
| 7. | No power to unit or the | 7. | Replacement Parts, page 32) | |
| 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 26). 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 |
| Refer to wiring diagram (see | |
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| poor ground to ignition mod- |
| Wiring Diagram, page 26) | |
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| ule |
| 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 | ||
30 | www.desatech.com |