TM 10-4610-239-24
TM 08580B-24/3
Table 3-1. Direct Support Troubleshooting - Continued
Malfunction
Test or Inspection
Corrective Action
BACKWASH PUMP ASSEMBLY - Continued
1. PUMP ELECTRIC MOTOR FAILS TO START WHEN BACKWASH SWITCH IS SET TO
START - Continued
Step 18.
Disconnect backwash pump cable connector P2 from RONVPU. Refer to interconnect
diagram figure FO-4. Check continuity between wire lugs on end of cable and P2-D.
If there is continuity between a wire lug and P2-D, go to step 19.
If there is no continuity between any wire lug and 'P2-D, repair backwash pump
cable assembly. Refer to paragraph 3-17.
Step 19.
Refer to interconnect diagram figure FO-4. Check continuity between terminal boardTB3-3
and junction box ground terminal El.
If there is continuity, repair cable W6. Refer to paragraph 3-17.
If there is no continuity, repair wiring harness W3S9. Refer to paragraph 3-39.
2. PUMP ELECTRIC MOTOR FAILS TO START WHEN ELEMENT CLEANING SWITCH IS SET TO START
WARNING
Electrical high voltage can cause serious injury or death. Some tests performed
in troubleshooting require power to be connected. Always take proper measures
to ensure personal safety.
NOTE
Ensure that all circuit breakers are set. Refer to figure FO-3 for schematic
and figure 3-12 for backwash pump assembly support diagram.
Step 1.
Set ELEMENT CLEANING SWITCH to OFF. Set BACKWASH switch to START and
release. Check if motor started.
If motor started, push PUSH EMERG STOP switch. Open door of ba kwash
c
timer and manually set timer knob to SERVICE position. Pull PUSH EMERG
STOP switch out. Go to step 2.
If motor did not start, go to step 3.
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