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 TM 55-1905-220-14-8
4-5. GENERAL (Continued).
Table 4-25. Hot Water Heater Troubleshooting (Continued).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
3. Relief valve discharges continuously.
Temperature and pressure relief valves are made to operate if the water temperature exceeds 210
F
(99 ) or water pressure exceeds 125 lbs (861.85 kPa).
C
Check for excessive temperature or pressure and correct condition.
If trouble is excessive
temperature, then thermostat is not shutting off at the right setting.
Replace.
4. Monitoring thermostat.
Step 1. Let water heater completely heat to a designated thermostat setting.
After thermostat satisfies, draw water from heater.
Step 2. Compare water temperatures of drawn water to the temperature setting of the thermostat when it
satisfies (that is, when the thermostat actually clicks off).
If these two readings do not coincide within acceptable tolerances and verification has been
made of the accuracy of the temperature reading gauge, re-calibrate the thermostat.
5. Magnetic contactor.
If magnetic contactor will not energize, and support components are functioning properly (thermostat
opens and closes manually, hi limit is open).
Replace complete magnetic contactor.
4-84
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