TM 10-3510-220-24
Table 2-2. Unit Troubleshooting (Continued)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
13. WATER HEATER TEMPERATURE GAGE SHOWS WATER EXCEEDS
SET TEMPERATURE. (Cont)
WARNING
High voltage is present on this equipment. Do not perform
maintenance with power on. Death or serious injury may
result.
Step 4.
Check for defective low water probe. With power off, measure continuity between
probe wire and ground. As water is drained from full to low levels, meter will read as
a short at first, then change abruptly to an open reading.
Notify Direct Support Maintenance for replacement
of low water probe.
14. WATER HEATER IS DISCHARGING THROUGH DRAIN TUBE WHILE IN USE.
Check for defective water pressure relief valve.
a.
Replace water pressure relief valve.
b .
If problem persists, notify your supervisor.
15. WATER HEATER BLOWER IS NOISY.
Step 1.
Check for obstruction of blower.
a.
If blower is obstructed, clean blower or remove obstruction.
b .
If blower is not obstructed, proceed to next step.
Step 2.
Loosen setscrew at fuel pump shaft and check for ease of blower rotation.
a.
If blower is not easy to rotate, replace blower assembly.
b.
If blower is serviceable and problem persist, notify your supervisor.
2-27
