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www.DaikinApplied.com 31
OM 1077-1 • MAVERICK I
Alarm Designation
Origin
Description
Status/Troubleshooting Information
Pressure Switch 1 Open
IFC
Energize inducer indefinitely until pressure switch
closes or call for heat goes away.
• Blocked Vent
• Undersized Vent
• Water in Pressure Switch Tubing
• Cracked Pressure Switch Tubing
• Inducer Not Running or Not Running
to Full Speed
• Low Line Voltage to Inducer Motor
• Bad Inducer Motor Capacitor
• Bad Inducer Motor Bearings
• Bad Pressure Switch
• Blocked Heat Exchanger
Freeze Sensor 1 Out of Range -FS1
DDC Controller
When reading the temperature below 37°F
compressor and runs indoor fan continuously. After
15 minutes of continuous reading above 42°F,
the control recovers from the alarm and resumes
operation.
• If temperature is not below 37°F
• Replace the sensor
• Check sensor is installed correctly on
control
Freeze Sensor 2 Out of Range -FS2
DDC Controller
When reading the temperature below 37°F
continuously for 15 minutes, the control shuts down
compressor and runs indoor fan continuously. After
15 minutes of continuous reading above 42°F,
the control recovers from the alarm and resumes
operation.
• If temperature is not below 37°F
• Replace the sensor
• Check sensor is installed correctly on
control
Freeze Sensor #1 Fail FS1
DDC Controller
Occurs when sensors are either open or shorted.
• Replace the sensor
• Check sensor is installed correctly on
control
Freeze Sensor #2 Fail FS2
DDC Controller
Lockout Temperature – Cooling
DDC Controller
When the outdoor temperature drops below the
cooling lockout temperature set point, the unit will
prevent the compressor from operating in cool
mode. Selectable range is between 30°F and 50°F,
with a default of 35°F.
• Check to make sure the outdoor
temperature is not below the set point
• Replace the sensor
Lockout Temperature – Heating
DDC Controller
When the outdoor temperature exceeds the heating
lockout temperature set point, the unit will prevent
any source of heat from operating. Selectable
range is between 70°F and 95°F, with a default of
90°F.
• Check to make sure the outdoor
temperature is not above the set point
• Replace the sensor
Pressure Switch 2 Closed
IFC
Leave inducer de-energized until pressure switch
open
• Bad Pressure Switch
Pressure Switch 2 Open
IFC
Energize inducer indefinitely until pressure switch
closes or call for heat goes away.
• Blocked Vent
• Undersized Vent
• Water in Pressure Switch Tubing
• Cracked Pressure Switch Tubing
• Inducer Not Running or Not Running
to Full Speed
• Low Line Voltage to Inducer Motor
• Bad Inducer Motor Capacitor
• Bad Inducer Motor Bearings
• Bad Pressure Switch
• Blocked Heat Exchanger
Running Blower Fault – Air Flow Switch Stuck
DDC Controller
Unit continues to operate
• Replace the pressure switch
Blower Fault – Blower Not Running – FP
DDC Controller
Complete unit shutdown.
• Indoor motor Not Running or Not
Running to Full Speed
• Low Line Voltage to Indoor motor
• Bad Indoor motor Capacitor/winding
• Bad Indoor motor Bearings
• Bad Pressure Switch
• Broken belt
• Indoor motor running backwards (3
phase)
• Open internal motor protector
ELM - OAE Sensor Fail
ELM
Sensor short, failure
• Replace the sensor
• Check sensor is installed correctly on
control