Slant Fin Galaxy boiler troubleshooting

Testing and thorough diagnostic are believed to require help of certified specialists. However, modern gas boilers are equipped with self-diagnostic systems, which report issues by showing error codes on the front panel display. The following table will help you identify the cause of your problem and solve it.

Burners fail to operate 1. Safety pilot out, or flame too low. 1. Check, clean, re-light.
2. Gas supply valve shut off. 2. Open gas valve(s).
3. Electric switch open. 3. Close switch.
4. Blown or defective line fuse. 4. Replace fuse.
5. Operating or limit control contacts open or dirty. 5. Check control. Clean contacts or replace control.
6. Defective gas valve or pressure regulator; or plugged bleed line. 6. Repair or replace.
7. Defective low voltage transformer. 7. Replace aquastat.
8. Obstruction at main burner orifice. 8. Check, clean and reinstall.
9. Break in wiring or loose contact at control terminals. 9. Check with test-light and correct.
10. Improper wiring. 10. Check and correct in accordance with wiring diagrams included with appliance instructions.
11. Improper controls. 11. Install proper controls.
12. Rollout or blocked vent safety switch open. 12. Replace rollout switch (inspect flue passages prior to replacement) or reset blocked vent safety switch by depressing the reset button
Burners will not shut off 1. Defective operating control, gas valve, or high limit control. 1. Check, repair or replace.
2. Improper wiring or short circuit. 2. Check wiring and controls.
Flash back – burning at orifices 1. Manifold gas pressure too low. 1. Adjust to proper manifold pressure.
2. Improper primary air adjustment. 2. Adjust air to produce soft, clean flame.
3. Gas regulator bleed too slow. 3. Adjust bleed opening.
4. Burrs on orifice. 4. Remove burrs.
5. Improperly drilled orifice plugs. 5. Install orifice plugs with proper drilling.
6. Leaking automatic gas valve. 6. Repair or replace.
7. Adverse draft condition in boiler room. 7. Check air supply and venting system.
8. Low main gas pressure. 8. Contact utility.
9. Safety pilot improperly installed. 9. Correct to manufacturer’s recommendations.
Delayed ignition 1. Pilot flame too low. 1. Increase gas supply to pilot.
2. Pilot burner ports or pilot orifice clogged. 2. Clean ports or orifices.
3. Burners or orifices out of alignment. 3. Realign burners or manifold.
4. Excessive primary air. 4. Adjust primary air shutters.
5. Excessive burner input. 5. Check and reduce to input shown on rating plate.
6. Adverse draft condition in boiler room. 6. Check air supply and venting system.
Fumes and gas odors 1. Leaks in gas piping or accessories. 1. Locate leaks and repair.
2. Gas leaks in service line or meter connections. 2. Close service supply valve – shut down appliance and notify utility.
3. Blocked chimney. 3. Check and repair chimney.
4. Boiler flueways blocked with soot. 4. Clean flueways and adjust burners as described in the installation instructions.
5. Undersized breeching or too many turns in breeching. 5. Check manufacturer’s recommendations.
6. Adverse draft condition in boiler room. 6. Check air supply and venting system.
7. Overfiring. 7. Adjust gas input to that shown on boiler rating plate.
Condensation in boiler flues or in vent system 1. Underfiring. 1. Increase firing rate to that shown on rating plate.
2. Boiler water maintained at too low a temperature level. 2. Set low limit controls to maintain a higher water temperature. If boiler is not equipped with low limit replace with one which has a combination low limit/high limit aquastat.
3. Long horizontal run of smokepipe. 3. Relocate boiler or insulate breeching.
4. Inadequate chimney or venting system. 4. Check chimney and venting recommendations