iWorx® MPU2
40
505-009, Effective: June 30, 2015
© 2015 Taco Electronic Solutions, Inc.
TROUBLESHOOTING
Diagnostic LEDs
The controller has 3 LED indicators. These indicators can aid in troubleshooting equipment operation problems. The
following table lists the functions of the controller’s LEDs in the order they appear from left to right on the unit.
Heating Failure
Normal, Alarm
Occurs when Supply Air tempera-
ture is
Supply Heat Limit
degrees
from the setpoint 10 minutes after
entering heating mode.
The cause of the emergency condition
must be resolved.
Cooling Failure
Normal, Alarm
Occurs when Supply Air tempera-
ture is
Supply Cool Limit
degrees
from the setpoint 10 minutes after
entering cooling mode.
The cause of the emergency condition
must be resolved.
Heat Stuck On
Normal, Alarm
Occurs when the mode is primary
off or primary fan only if the supply
air temperature does not drop
below 150
°F after five minutes.
The cause of the emergency condition
must be resolved.
Maintenance
Normal, Alarm
Occurs when the fan, heating, or
cooling operating hours have
exceeded their Runtime limit.
To clear the alarm, a user must enter
a new value for the alarm limit or reset
the accumulated times to zero.
LED Indication
Status
– Solid green when running and configured by an LCI (networking)
– Flashing green when running and NOT configured by an LCI (stand-alone)
– Solid red when a fault condition exists (control shut down)
– Blinking Red - the controller has a device failure
– Solid Amber - The controller has not received a LCI ping message in over 10 minutes and is part of a network.
Network
– Yellow while the controller is transmitting data onto the FTT-10A network
– Green when there is network activity
– Off when there is no network activity
Service
– Illuminated when the service pin is depressed or when a controller gets configured by the LCI.
Alarm
Range
Alarm Trigger
Alarm Reset
