Table 2-2. Unit Troubleshooting (Continued)
TEST OR INSPECTION
WATER HEATER FUEL PUMP FAILS TO DELIVER FUEL TO BURNER. (Cont)
Check for clogged fuel nozzle.
If fuel nozzle is clogged, remove and clean nozzle. Refer to
If fuel nozzle is not clogged, proceed to next step.
Check for looseness of fuel pump drive coupling.
If drive coupling is loose, tighten fuel pump drive coupling.
Refer to paragraph 2-37.
b. If drive coupling is not loose, proceed to next step.
Check for no activation of fuel solenoid or activation at wrong times.
a. If solenoid does not activate or activates at wrong time,
notify your supervisor.
If solenoid activates correctly, proceed to next step.
Check for restrictions in fuel hoses.
If fuel hose is restricted, disconnect fuel hose and remove
If fuel hose is not restricted, proceed to next step.
Check for shaft seal leaks on fuel pump.
If pump leaks, repair pump. Refer to paragraph 2-37.
If shaft seals are serviceable and problem persists, notify
WATER HEATER BURNER FAILS TO IGNITE OR IGNITION IS DELAYED.
Check for low fuel supply in fuel container.
If container is low on fuel, fill container with fuel.
If container fuel level is correct, proceed to next step.