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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| 2. | valve is OFF | 2. | supply | |
| Air in gas line | Hold regulator control valve in | |||
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| PILOT position for | |
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| to purge air. If you smell gas | |
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| stop and wait a few minutes | |
| 3. | Construction debris clog- | 3. | before trying to light fireplace | |
| 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 | ||||
| 5. | Control valve knob is not on | 5. | Turn control knob to pilot | |
| 6. | the PILOT position | 6. | Have a qualified technician | |
| Kinked pilot line | ||||
| 7. | Bad control valve | 7. | replace pilot line | |
| Have a qualified technician | ||||
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| replace valve |
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Pilot will not stay lit | 1. Loose wiring on thermopile to | 1. | Check wiring connections (see | ||
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| regulator. No millivolt current |
| Wiring Diagrams, page 15) | |
| 2. | being sent back to regulator | 2. | Have a qualified technician | |
| If valve knob and wall switch | ||||
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| are in the ON position, prob- |
| replace valve | |
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| able defective control valve |
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No gas to burner, although wall | 1. Wall switch wires defective | 1. | Check electrical connections | ||
switch and valve are set to the | 2. Thermopile or sensor not | 2. | and wires for continuity | ||
ON position | 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 | |
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Pilot goes out when wall switch | 1. Millivolt output on thermo- | 1. | Have a qualified technician | ||
is ON |
| pile too high |
| replace thermopile |
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Spark ignitor will not light pilot | 1. Defective ignitor (no spark at | 1. | Check for spark at electrode | ||
after repeated triggering of red |
| electrode) |
| and pilot. If no spark and | |
button |
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| electrode wire is properly | |
| 2. | Defective pilot or misaligned | 2. | connected, replace ignitor | |
| Check gap at electrode and | ||||
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| electrode at pilot (spark at |
| pilot. Gap should be 1/8" for | |
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| electrode) |
| strong spark. If gap is correct | |
| 3. | Low line pressure | 3. | but no spark, replace pilot | |
| Contact your local NG or LP | ||||
| 4. | No propane/LP gas in tank | 4. | gas supplier | |
| Refill supply tank (propane/LP | ||||
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| (Propane/LP units only) |
| only) | |
16 | www.desatech.com |
