28
TROUBLESHOOTING
TROUBLESHOOTING
Note: For additional help, visit DESA International’s technical service web site at www.desatech.com.
WARNING: Turn off heater and let cool before servicing. Only a quali- fied 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, | The two most common causes of a malfunctioning gas appliance are: | |
make sure the gas shutoff valve is ON. | 1. | Loose wiring connections |
| 2. | Construction debris clogging the pilot and/or gas control valve filter |
OBSERVED PROBLEM | POSSIBLE CAUSE | REMEDY | ||
Ignitor will not spark or pilot will not light | 1. | No gas supply, or shutoff valve is OFF | 1. | Check to see if you have gas supply and |
|
|
|
| that equipment shutoff valve is opened |
| 2. | Air in gas line | 2. | Repeat lighting procedure several times |
|
|
|
| to purge all air out of lines. If after re- |
|
|
|
| peated attempts appliance does not light, |
|
|
|
| call for qualified service and repair. |
| 3. | Construction debris clogging pilot orifice | 3. | Remove debris and dirt, inspect and |
|
|
|
| clean any other possible obstructions |
| 4. | Low gas pressure | 4. | Contact your gas supplier to check |
|
|
|
| pressure |
| 5. | Kinked pilot line | 5. | Have a qualified technician replace pi- |
|
|
|
| lot line |
| 6. | Control valve knob is not opening | 6. | Replace control valve (Refer to Replace- |
|
|
|
| ment Parts, page 30) |
| 7. | No power to unit or the ignition module | 7. | Check that main power is on and that all |
|
| or power transformer is bad |
| wire connections are made correctly to |
|
|
|
| the ignition model (see Wiring Diagram, |
|
|
|
| page 24). Check for 24 VAC at the sec- |
|
|
|
| ondary side of the transformer. If 24 |
|
|
|
| VAC is present, and the module does not |
|
|
|
| operate, have the module replaced oth- |
|
|
|
| erwise have the transformer replaced. |
| 8. | Vent damper not fully open | 8. | Open vent damper until fully locked in |
|
|
|
| OPEN position |
|
|
|
|
|
Pilot will not stay lit | 1. | Loose wiring on ignitor wire to ignition | 1. | Check wiring connection. Refer to wir- |
|
| module and/or poor ground to ignition |
| ing diagram (see Wiring Diagram, page |
|
| module |
| 24) and/or check ground wire to igni- |
|
|
|
| tion module |
| 2. | Pilot flame too low to sense | 2. | Clean and adjust pilot burner and check |
|
|
|
| gas supply and inlet pressure to unit |
|
|
| Note: Have a qualified technician replace | |
|
|
| pilot assembly if broken or corroded | |
|
|
|
|
|
No gas to burner, although wall switch and | 1. | Wall switch wires defective or too long | 1. | Check electrical connections |
valve are set to the ON position |
|
|
|
|
|
|
|
|
|
Frequent pilot outage | 1. | Pilot flame may be too low, causing | 1. | Clean and adjust pilot flame for maximum |
|
| safety pilot to “drop out” |
| flame impingement on thermopile |
| 2. | Improper venting or excessive blockage | 2. | Have the vent system inspected, includ- |
|
|
|
| ing the termination cap. Remove any |
|
|
|
| restriction or obstruction |
For | . | .com |
