| Problem | Possible Cause | Solution |
| No Heat | No power | Check master switch and circuit breaker or fuse. |
| Not enough water in boiler | Add water by opening fill valve; or adjust automatic fill valve | |
| Defective Thermostat | Clean or replace thermostat | |
| Cold Radiator | Air vent plugged | Remove and clean or replace |
| Closed inlet valve | Open valve completely | |
| Radiator out of adjustment | Adjust thermostatic air ve3nt or thermostatic inlet valve; if none, install thermostatic air vent | |
| Hammering Noise | Radiator not sloped | Check radiator with a level, if not sloped slightly toward outflow end, shim opposite end |