OWNER’S MANUAL
TROUBLESHOOTING
Note: For additional help, visit DESA International’s technical service web site at www.desatech.com.
Note: All troubleshooting items are listed in order of operation.
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.
OBSERVED PROBLEM | POSSIBLE CAUSE | REMEDY | ||
Ignitor will not spark or pilot will not light | 1. | No gas supply, or equipment shutoff | 1. | Check to see if you have gas supply and |
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| valve is OFF |
| that the equipment shutoff valve is |
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| opened |
| 2. | Air in gas line | 2. | Repeat lighting procedure several times |
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| to purge all air out of lines. If after re- |
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| peated attempts appliance does not light |
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| call for qualified service and repair |
| 3. | Construction debris clogging pilot orifice | 3. | Remove debris and dirt, inspect and |
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| clean any other possible obstructions |
| 4. | Low gas pressure | 4. | Contact your gas supplier to check pres- |
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| sure |
| 5. | Kinked pilot line | 5. | Have a qualified technician replace pi- |
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| lot line |
| 6. | Control valve knob is not opening | 6. | Replace control valve (Refer to Replace- |
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| ment Parts, page 30) |
| 7. | No power to unit or the ignition module | 7. | Check that main power is on and that all |
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| or power transformer is bad |
| wire connections are made correctly to |
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| the ignition model (see Wiring Diagram, |
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| page 30). Check for 24 VAC at the sec- |
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| ondary side of the transformer. If 24 |
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| VAC is present and the module does not |
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| operate, have the module replaced oth- |
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| erwise have the transformer replaced |
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Pilot lights but will not stay lit | 1. | Loose wiring on ignitor wire to ignition | 1. | Check ignitor wire connection. Refer to |
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| module and/or poor ground to ignition |
| wiring diagram (see Wiring Diagram, |
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| module |
| page 30) and/or check ground wire to |
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| ignition module |
| 2. | Pilot flame too low to sense | 2. | Clean and adjust pilot burner and check |
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| gas supply and inlet pressure to unit |
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| Note: Have a qualified technician replace | |
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| pilot assembly if broken or corroded | |
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No gas to main burner, although wall switch | 1. | Wall switch wires defective or too long | 1. | Check electrical connections |
and valve are set to the ON position | 2. | Sensor, valve, or ignition module is not | 2. | Recheck problems 1 and 2 |
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| operating |
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Frequent main burner outage | 1. | Pilot flame may be too low, causing | 1. | Clean and adjust pilot flame for maximum |
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| safety pilot to “drop out” |
| flame impingement on sensor |
| 2. | Vent may be blocked or restricted | 2. | Have vent inspected for blockage or |
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| damage |
www.desatech.com | Continued |
107205 | 27 | For more information, visit www.desatech.com |