Uncoded Troubleshooting Guide(concluded)
MALFUNCTION
POSSIBLE CAUSE
REMEDY
Random or erratic action
1. Battery pack circuit
1. Turn off battery pack
of signals on the display
breaker turned on before
circuit breakers, turn on the
board.
MAINS circuit breakers
MAINS circuit breakers, and
were turned on.
then turn on battery pack
circuit breaker.
2. Wire connections
2. Check wiring between
between control board and control board and display
display board.
board.
3. Display board
3. Replace display board.
malfunction.
4. Control board
4. Replace control board.
malfunction.
Solenoid hum.
1. Loose coil housing.
1. Bend housing to make
firm contact with coil.
2. Buildup of foreign
2. Repair the valve.
material on top of core
assembly.
End of Appendix B
MD0354
B-2
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