As is the case with all mechanical and electrical equipment, it is recognized that occasional repair and adjustment may be necessary on any burner. Table 2-4 represents a very general list of troubles and causes that can occur with gas burners and gives some suggested remedies.
Table 2-4 Troubleshooting Gas Burners
| Symptom and Possible Cause | Possible Remedy |
| Pilot does not light. | |
| (a) Air in gas line. | (a) Clear or replace line. |
| (b) High or low gas pressure. | (b) Check for possible gas supply problem with local gas company; replace defective burner. |
| (c) Blocked pilot orifice. | (c) Clean orifice or replace. |
| (d) Flame runner improperly located. | (d) Move to correct location. |
| Pilot goes out frequently during standby or safety switch needs frequent resetting. | |
| (a) Restriction in pilot gas line. | (a) Clear or replace line. |
| (b) Low gas pressure. | (b) Check for possible gas supply problem first with local gas company; Replace defective burner. |
| (c) Blocked pilot orifice. | (c) Clear blockage or replace. |
| d) Loose thermocouple connection on 100 percent shutoff. | (d) Secure connection or replace defective thermocouple. |
| (e) Defective thermocouple or pilot safety switch. | (e) Replace thermocouple or pilot safety switch. |
| (f) Poor draft connection. | (f) Correct. |
| (g) Draft tube set into or flush with inner wall of combustion chamber. | (g) Move tip of draft tube to proper location. |
| Pilot goes out when motor starts. | |
| (a) Restriction in pilot gas line. | (a) Remove restriction or replace line. |
| (b) High or low gas pressure. | (b) Check for possible gas supply problem with local gas company; replace defective burner. |
| (c) Excessive pressure drop when main gas valve opens. | (c) Check for possible gas supply problem with local gas company; test main gas valve and replace if defective. |
| Burner motor does not run. | |
| (a) Burned-out fuse or tripped circuit breaker. | (a) Replace fuse or reset circuit breaker. If problem continues, call an electrician. |
| (b) Thermostat or limit defective or improperly set. | (b) Reset thermostat or limit, or replace if defective. |
| (c) Relay or transformer defective. | (c) Replace relay or transformer. |
| (d) Motor burned out. | (d) Replace motor or burner. |
| (e) Tight motor bearings from lack of oil. | (e) Lubricate bearings; repair or replace damaged bearings. |
| (f) Improper wiring. | (f) Check wiring diagram for burner and rewire correctly. |
| Burner motor running but no flame. | |
| (a) Pilot out. | (a) Relight pilot or replace defective pilot. |
| (b) Pilot safety switch needs to be reset. | (b) Reset switch. |
| (c) Thermocouple not generating sufficient voltage. | (c) Replace defective thermocouple. |
| (d) Very low or no gas pressure. | (d) Check for possible gas supply problem with local gas company; check for obstruction in gas line and correct. |
| (e) Motor running too slow. | (e) Replace defective motor. |
| Short and/or noisy burner flame. | |
| (a) Pressure regulator set too low. | (a) Change to proper setting. |
| (b) Air shutter open too wide. | (b) Correct opening size. |
| (c) Too much pressure drop in gas line. | (c) Check for possible gas supply problem with local gas company; check for obstruction in gas line and correct. |
| (d) Vent in regulator plugged. | (d) Clear vent. |
| (e) Defective regulator. | (e) Replace regulator. |
| Long yellow flame. | |
| (a) Air shutter not open enough. | (a) Adjust opening. |
| (b) Air openings or blower wheel clogged. | (b) Clear. |
| (c) Too much input. | (c) Reduce input. |
| Main gas valve does not close when blower stops. | |
| a) Defective valve. | (a) Replace valve. |
| (b) Obstruction on valve seat. | (b) Remove obstruction. |
