Cleaning and
Maintenance
Continued
venting system
Conduct annual inspection of the venting system following these guidelines:
1.Check areas of venting system that are exposed to the weather for corrosion (rust spots or streaks and, inextremecases,holes).Havetheseitemsreplaced immediately by a qualified service person.
2.Remove the vent cap and shine a flashlight into the vent. Remove any foreign material.
3.Check for evidence of excessive condensation. Continuous condensation can cause corrosion of caps, pipes and fittings and can be caused by having excessive lateral runs, too many elbows or exterior portions of the system being exposed to cold weather.
4.Inspect joints to verify that no pipe section or fitting has been disturbed and loosened. Check mechani- cal supports such as wall straps for rigidity.
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 | ||||
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| several times to purge all air | |
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| out of lines. If after repeated | |
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| attempts appliance does not | |
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| light, call for qualified service | |
| 3. | Construction debris clogging | 3. | 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 igni- | 7. | Replacement Parts, page 34) | |
| Check that main power is | ||||
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| tion module or power trans- |
| on and that all wire connec- | |
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| former is bad |
| tions are made correctly to | |
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| the ignition model (see Wiring | |
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| Diagram, page 27). 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 | |
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| transformer replaced | |
www.desatech.com | 31 |
