Maytag Amana VZC20, Installation & Service Reference

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(If using a CTK04 thermostat, please see the addendum
for further instructions.)
Fault Code History
The heat pump’s diagnostics menu provides access to the
most recent faults. The six most recent faults can be
accessed through the control board seven segment
displays or the CoolCloud mobile app. Any consecutively
repeated fault is stored a maximum of three times.
Example: A leak in the system, low refrigerant charge or an
incompletely open stop valve can cause the unit to flash
error code E15. This error code suggests that the unit is
experiencing operation at low pressure. The control will
only store this fault the first three consecutive times the
fault occurs.
NOTE: The fault list can be cleared after
performing maintenance or servicing the system
to assist in the troubleshooting process.
Device Status
This menu displays information about the systems current
status. This menu can be utilized to confirm correct
functionality of the equipment and for troubleshooting
purposes.
The following items will be displayed:
• Heat Capacity Request Percentage
• Cool Capacity Request Percentage
• Heat Capacity Request During Defrost Percentage
• Dehumidification Request Percentage
• Reversing Valve Status
• Reported Airflow by Indoor Unit
• Boost Mode
• Previous Defrost Run Time
Sensor Data
The following sensor values will be displayed:
• Outdoor Temperature
• Coil Temperature
• Liquid Line Temperature
• Discharge Temperature
• Defrost Sensor
• Suction Pressure
Pump Down / Charge Mode
This function can be enabled in this menu.
System Verification Test
The mandatory system verification test is enabled from this
menu, which enables a functional check of the equipment,
in addition to ensuring proper stop valve position.
Cool Set-up
The system allows for the adjustment of several cooling
performance variables. Cool Airflow Trim (*1), Cool Airflow
Profiles, Cool Fan ON Delay, Cool Fan OFF Delay and
Dehumidification Select (some enable option or off) can
be adjusted in this menu. You can also reset this entire
menu to factory default settings. See the following images
showing the four cooling airflow profiles.
Cooling Airflow Profile
• Profile A provides only an OFF delay of one (1)
minute at 100% of the cooling demand airflow.
• Profile B ramps up to full cooling demand airflow
by first stepping up to 50% of the full demand for
30 seconds. The motor then ramps to 100% of the
required airflow. A one (1) minute OFF delay at 100%
of the cooling airflow.
50% CFM
1/2 min
100% CFM
100% CFM
1 min
OFF
OFF
• Profile C ramps up to 82% of the full cooling demand
airflow and operates there for approximately 7 1/2
minutes. The motor then steps up to the full demand
airflow. Profile C also has a one (1) minute 100% OFF
delay.
100% CFM
OFF
OFF
• Profile D (default) ramps up to 50% of the demand
for 1/2 minute, then ramps to 82% of the full cooling
demand airflow and operates there for approximately
7 1/2 minutes. The motor then steps up to the full
demand airflow. Profile D has a 1/2 minute at 50%
airflow OFF delay.
OFF
OFF
Airflow Tables
Heat Set-up
This menu allows for the adjustment of several heating
performance variables. Heat Airflow trim (*1), Heat Fan ON
Delay, Heat Fan OFF Delay and timed Defrost interval can
be adjusted in this menu. Time interval of 30, 60, 90 and
120 minutes between two defrost cycles can be set to suit
the weather conditions and performance of the unit.