Table 2-2. Unit Troubleshooting (Continued)
TEST OR INSPECTION
WATER HEATER FLAME FAILS DURING FIRING CYCLE. (Cont)
Check fuel filter strainer for obstructions.
Rotate fuel strainer handle to clear obstructions.
Check feed and return fuel hose assemblies to see if they are reversed.
Disconnect and reconnect fuel hose assemblies in correct position.
High voltage is present on this equipment. Do not perform maintenance
with power on. Death or serious injury may result.
Check ignition cable assemblies for loose connections at electrode and
Make sure power is off and tighten connections at electrode and transformer
Check for defective flame safeguard control. With power off, loosen thumb screw and
remove fire eye cover. Check flame safeguard circuit board for damage, corrosion, and
burnt, loose, or missing purge timing card.
If any of these conditions are found, notify your supervisor. If these conditions are
not found, proceed to next step.
Check for clogged fuel pump strainer.
If strainer is clogged, clean strainer. Refer to paragraph 2-39.
If strainer is clean, proceed to next step.