Water temperature below | Faulty thermostat. | Check thermostat adjustment. |
settings at all times |
| Monitor thermostat as described in |
|
| Section III, Quarterly Inspection. |
|
| Replace if necessary. |
| Blown fuse in element fuse | Replace fuse. |
| block, if installed. |
|
| Heating element not working | Check to see that heating element |
| on all phases | is working on all phases, by |
|
| checking the resistance (ohms) |
|
| value for each element and |
|
| comparing with the chart included |
|
| in Section VI. |
| Heater improperly sized | Verify heater is properly sized for |
|
| the flow rate and temperature rise |
|
| of your system. See formulas |
|
| included in Section VI. Replace |
|
| elements with proper size as |
|
| necessary. |
Relief valve discharges | Excessive temperature or | Temperature and pressure relief |
continuously | pressure in tank | valves are made to operate if the |
|
| water temperature exceeds 210°F |
|
| or water pressure exceeds the |
|
| pressure rating of the safety relief |
|
| valve. If trouble is excessive |
|
| temperature, then thermostat is not |
|
| shutting off at the right setting and |
|
| thermostat must be replaced. |
15
