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ELECTRICAL INTERLOCK BOX TROUBLESHOOTING
PROBLEM/SYMPTOM POSSIBLE CAUSE SOLUTION
‘MAIN POWER’ light not on • No power to electrical interlock box • Check power connections & breakers
• No neutral in 120 VAC supply • Hook up neutral
• Light burnt out • Replace light
‘MCI’ light not on • 120 VAC signal not connected • Jumper terminal from #1 to #4
to terminal #4
• Light burnt out • Replace light
• No neutral in 120 VAC supply • Hook up neutral
‘VACUUM SYSTEM’ light • No power to electrical interlock box • Check power connections & breakers
not on
• No MCI • Jumper terminal from #1 to #4
• No neutral in 120 VAC supply • Hook up neutral
• No vacuum • Adjust injector vacuum, or
Check tubing for leaks, or
Check for booster pump operation, or
Turn to “OFF” and back to reset
• Light burnt out • Replace light
‘ORP’ light not on • No power to electrical interlock box • Check power connections & breakers
• No MCI • Jumper terminal from #1 to #4
• No neutral in 120 VAC supply • Hook up neutral
• No vacuum • Adjust injector vacuum, or
Check tubing for leaks, or
Check for booster pump operation, or
Turn to “OFF” and back to reset
• System set to “MANUAL” • Switch to “AUTO”
• No 120 VAC power to terminals • Hook up power to these terminals
#5 and #6 (see manual)
• ORP level in excess of preset level • Check input signal
• Light burnt out • Replace light
Flow meter ball does not adjust • No vacuum • Adjust injector vacuum
•Vacuum leak • Check and tighten ttings
•In and out hoses reversed • Switch hoses
• Defective solenoid • Inspect and repair or replace solenoid
• Defective check valve • Check and replace check valve
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