Troubleshooting
Electronic IGNITION
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: All troubleshooting items are listed in order of operation.
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 valve | 1. | Check to see if you have gas | |
will not light |
| 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, and | ||||
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| pilot orifice |
| inspect 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 igni- | 7. | Replacement Parts, page 44) | |
| Check that main power is on | ||||
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| tion module |
| and that wire connections are | |
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| made correctly to the ignition | |
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| model (see Wiring Diagram, | |
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| page 24). Check for 24 VAC | |
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| at the secondary side of the | |
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| transformer. If 24 VAC is pres- | |
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| ent, and the module does not | |
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| operate, have the module | |
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| replaced otherwise have the | |
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| transformer replaced. |
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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 24) | |
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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 | |
pressure to unit Note: Have a qualified technician replace pilot assembly if broken or corroded
42 | www.desatech.com |
