TROUBLESHOOTING
MILLIVOLT SYSTEM
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 | ||
Pilot will not light | 1. No gas supply or shutoff | 1. | Check to see if you have gas | |
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| valve is OFF |
| supply |
| 2. | Air in gas line | 2. | Hold regulator control valve |
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| in the PILOT position for 2 to |
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| 3 minutes to purge air. If you |
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| smell gas stop and wait for a |
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| few minutes before trying to |
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| light the fireplace |
| 3. | Construction debris clog- | 3. | Remove debris and dirt, in- |
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| ging pilot orifice |
| spect and clean any other |
| 4. | Low gas pressure |
| possible obstructions |
| 4. | Contact your gas supplier | ||
| 5. | Control valve knob is not on | 5. | Refer to section on pilot |
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| the PILOT position |
| lighting |
| 6. | Kinked pilot line | 6. | Have a qualified technician |
| 7. | Bad valve |
| replace pilot line |
| 7. | Replace control valve (see | ||
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| Replacement Parts, page 19) |
Pilot will not stay lit | 1. | Loose wiring on thermopile |
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| to control valve. |
| 2. | No millivolt current is being |
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| sent back to regulator |
| 3. | If valve knob and wall switch |
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| are in the ON position, prob- |
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| able defective control valve |
1.Check wiring connections. Refer to wiring diagrams on page 15
2.Have a qualified technician check millivolts
3.Have a qualified technician replace valve (see Replace- ment Parts and Accessories, page 19)
No gas to burner, although wall | 1. | Wall switch wires defective | 1. | Check electrical connections |
switch and valve are set to the |
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| and wires for continuity |
ON position | 2. | Thermopile or sensor not | 2. | See Pilot will not stay lit, |
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| generating sufficient voltage |
| above |
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Frequent pilot outage | 1. | Pilot flame may be too | 1. | Clean and adjust pilot flame |
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| low, causing safety pilot to |
| for maximum flame impinge- |
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| “drop out” |
| ment on thermopile |
Pilot goes out when wall switch is ON
1.Millivolt output on thermo- pile too high
1.Have a qualified technician replace thermopile
www.desatech.com | 17 |
