Table 4-2. Troubleshooting (Cont'd).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
WATER HEATER ASSEMBLY-Continued
3. PULSATING PRESSURE INDICATED ON'GAGE
Step 1. Check for clogged fuel pump strainer.
Remove and clean strainer (para 4-41b ).
Step 2. Check for clogged fuel filter.
Clean filter (para 4-41c ).
Step 3. Check for defective burner nozzle.
Replace nozzle (para 4-33).
4. FUEL PUMP LEAKS
Step 1. Check for loose strainer cover.
Tighten all cover screws.
Step 2. Check for loose plugs.
Tighten plugs.
Step 3. Check for broken or excessively worn shaft seals.
Install serviceable pump (para 4-41).
5. FUEL PUMP FAILS TO DELIVER FUEL TO BURNER
Step 1. Check for clogged fuel pump strainer.
Remove and clean strainer (para 4-41 b).
Step 2. Check for clogged fuel nozzle.
Remove and clean nozzle (para 4-33d (2)).
Step 3. Check for reversed rotation.
Interchange any two of the external leads at the motor (para 4-43).
Step 4. Check for improper installation of fuel pump.,
Check installation. If improperly installed, remove and install pump
properly (para 4-41).
Step 5. Check for broken solenoid valve.
Install serviceable valve (para 4-40i).
Step 6. Check for loose fuel pump drive coupling.
Tighten coupling (para 4-41f).
6. FLAME FAILS IN BURNER
Step 1. Check for excessively worn or broken fuel pump.
Install serviceable pump (para 4-41 a).
Step 2. Check for clogged fuel line.
Clean fuel line (paras 4-41 and 4-42).
Step 3. Check for clogged fuel nozzle.
Remove and clean nozzle (para 4-33d (2)).
Step 4. Check for burned electrodes.
Clean electrodes (para 4-33d (1)).
Step 5. Check electrodes for proper adjustment.
Adjust electrodes (para 4-33e ).
7. IGNITION TRANSFORMER HAS NO SPARK
Step 1. Check transformer wiring for open or shorted circuit.
Install serviceable transformer (para 4-30 and para 6-7).
Step 2. Check for disconnected transformer-to-cable assembly.
Connect cable (para 4-30).
8. IGNITION TRANSFORMER HAS FAULTY OR WEAK SPARK
Step 1. Check for loose transformer-to-burner cable assembly.
Seat cable firmly and securely in transformer cover (para 4-30).
9. SMOKE ESCAPING AROUND BOILER BOX COVER
Step 1. Check for deteriorated or excessively worn gasket.
Install serviceable gasket (para 4-32).
10. WATER OVERHEATS
Step 1. Check pressure and temperature control for proper operation (para 6-10).
Install serviceable control (para 4-40f).
11. WATER HEATS INCONSISTENTLY
Step 1. Check firebox for carbon deposits.
Remove boiler box cover (para 4-32) and clean smokebox.
12. BLOWER AND FUEL PUMP MOTOR NOISY
Step 1. Check for excessively worn bearings.
Install serviceable motor (para 4-43).
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