Lochinvar LECTRUS KEB0015 Service Manual page 45

3
Troubleshooting
Table 3-6 Troubleshooting Chart - Check MCB Status
LED STATUS
BLUE ORANGE YELLOW
OFF OFF OFF
OFF OFF ON
OFF ON OFF
OFF BLINK OFF
OFF ON ON
ON OFF OFF
ON ON ON
BLINK OFF OFF
BLINK ON OFF
(continued)
FAULT DESCRIPTION
None No fault – Unit running normally
The fan for the triac has a
Fan
tachometer error
Pressure in the system is too high
Pressure
or outside limit
Pressure Pressure in the system is too low
Unbalance Current between lines is unbalanced
Input voltage of the 24VDC is too
Power
low
Address Address of the MCB is incorrect
The internal voltage of the MCB is
Input voltage
detecting an error
Line current The line current is too low
Service Manual
TM
CORRECTIVE
ACTION
• None
• Make sure the fan is connected
in the triac board.
• Verify the fan is running when
there is a demand for heat.
• Replace the fan.
• Check the pressure of the
system.
• Verify that the pressure is at
least 12 PSI.
• If equipped, the monitoring of the
line is detecting an unbalance
between phases. Check for a
damaged element.
• Check for blown fuses.
• Verify the PSU is providing
24VDC.
• Make sure the connections to the
MCB are secure.
• Replace the MCB.
• Make sure the main MCB is set
as address 0 (all address switch
S2 OFF).
• If equipped, make sure additional
MCB's don't have duplicated
addresses on S2.
• Make sure the communication
cable between MCB's is good
and not damaged. Replace the
MCB.
• Replace the MCB.
• If equipped, the monitoring of
the line is too low for the power
requested.
• Check elements for any damage.
• Verify that the contactors are
activating.
• Verify that the fuses are in good
condition.
45