Troubleshooting
6-4 Manual # 42-02-1P21
Table 6.1 Status and Error Messages
Scrolling Message - Special Event Message
2 BUS IS LOW
Description: 2 bus (120VAC) monitoring input is low.
Troubleshooting:
1. Check 2 bus fuses.
2FS BUS IS LOW
Description: 2FS bus (120VAC) monitoring input is low.
Troubleshooting:
1. Check 2 bus fuses.
2HA BUS IS LOW
Description: 2HA (120VAC) bus monitoring input is low.
Troubleshooting:
1. Check 2 bus fuses.
2MV BUS IS LOW
Description: 2MV (120VAC) bus monitoring input is low.
Troubleshooting:
1. Check 2 bus fuses.
ABD INPUT FAILURE (CTLB)
Description: The Bottom Down Access (ABD) switch is high when 2HA bus is low.
Troubleshooting:
1. Check for incorrect wiring or short on the HC-CTL board ABD input and 2HA or 2 bus
2. Check the bottom access switch and associated wiring per the job prints.
ABU INPUT FAILURE (CTLB)
Description: The Hoistway Access Bottom Up (ABU) switch is high when 2HA bus is low.
Troubleshooting:
1. Check for incorrect wiring or short on the HC-CTL board ABU input and 2HA or 2 bus.
2. Check the bottom access switch and associated wiring per the job prints.
ACCESS ENABLED (CTLA)
Description: The controller is in Inspection Access mode, activated by either 120VAC at the
Access Enable Switch input (screw terminal INA) on the HC-CTL board or by placing the front or
rear hoistway or car door bypass switches in the bypass position.
ATD INPUT FAILURE (CTLB)
Description: The Top Down Access (ATD) switch is high when 2HA bus is low.
Troubleshooting:
1. Check for incorrect wiring or short on the HC-CTL board ATD input and 2HA or 2 bus.
2. Check the top access switch and associated wiring per the job prints.
ATTENDANT SERVICE OPERATION
Description: The car is on attendant operation. The attendant service input (ATS) is activated.
Troubleshooting: Go into Program Mode and check to see if any spare inputs are programmed as
ATS. Then check to see if that particular input is activated.
ATU INPUT FAILURE (CTLB)
Description: The Top Up Access (ATU) switch is high when 2HA bus is low.
Troubleshooting:
1. Check for incorrect wiring or short on the HC-CTL board ATU input and 2HA or 2 bus.
2. Check the top access switch and associated wiring per the job prints.
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