Amana AVZC18 Installation & Service Reference page 31

T
ROUBLESHOOTING
ClimateTalk PCB LED Transmitted ClimateTalk
Fault Code Display
22 E22 HI DISCH TEMP
23 E23 DISCH TEMP FAIL
24 E24
25 E25 AIR SENSOR FLT
26 E26 PRESSURE SENSOR
28 E28 COIL TEMP FAIL2
29 E29 LIQ TEMP FAIL
30 E30 OD CTRL FAIL3
32 E32 HI TEMP CTRL1
33 - HI TEMP CTRL2
34 E34 CURRENT SPIKE
Thermostat Fault
Message
This error indicates the equipment is
experiencing frequent high discharge
temperature faults.
Discharge thermistor is not put on
correct position.
The control has detected that the
Discharge Temperature Sensor is out of
range.
The high pressure switch is open.
HPS OPEN
The outdoor air temperature sensor is
open or shorted.
The control determines that the pressure
sensor is not reacting properly.
The control has detected that the
Outdoor Coil Temperature Sensor is out
of range.
The control has detected that the Liquid
Temperature Sensor is out of range.
Indicates the control board may need to
be replaced.
This error indicates the equipment is
experiencing high temperature faults on
the outdoor control board.
This error indicates the equipment is
experiencing high temperature faults on
the outdoor control board. Control has
determined continued operation is
acceptable. This indicates they may be
a problem with the equipment.
Board detected a high current condition.
This indicates the potential for a short
circuit.
Probable Causes
● Discharge thermistor inoperable or
improperly connected
● Discharge thermistor is put on incorrect
position or off
● Low refrigerant charge
● Overcharge
● Faulty compressor
● Discharge thermistor inoperable or
improperly connected
● High pressure switch (HPS) inoperable
● Faulty outdoor thermistor sensor or
disconnect
● Low pressure sensor inoperable or not
properly connected
● Outdoor coil thermistor inoperable or not
properly connected
● Liquid thermistor inoperable or not properly
connected
● Wiring to control board disconnected
● Faulty control board
● Noise
● Ambient air conditions too high
● Cooling bracket screw(s) missing or not
properly fastened
● No or poor thermal grease coating between
cooling plumbing and cooling bracket on
control board
● No flow or limited flow through control board
cooling circuit (potential restriction in line or
low refrigerant)
● Stop valve not completely open
● Ambient air conditions too high
● Cooling bracket screw(s) missing or not
properly fastened
● No or poor thermal grease coating between
cooling plumbing and cooling bracket on
control board
● No flow or limited flow through control board
cooling circuit (potential restriction in line or
low refrigerant)
● Stop valve not completely open
● Current spike in supply
● Stop valve not completely open
● The compressor wire is lost phase
● Faulty control board
● Faulty compressor
31
Corrective Actions
● Check discharge thermistor resistance and
connections; Repair/replace as needed
● Check discharge thermistor position
● Check refrigerant charge level; Adjust if needed
● Check the compressor; Repair/replace if needed
● Check discharge thermistor resistance and
connections; Repair/replace as needed
● Check resistance on HPS to verify operation; Replace
if needed
● Inspect and test sensor; Replace sensor if needed
● Check the connection to low pressure sensor;
Repair/replace if needed
● Check the connection to OD coil thermistor;
Repair/replace if needed
● Check the connection to liquid thermistor;
Repair/replace if needed
● Check wiring to control board; Repair as needed
● Replace control board if necessary
● Cycle power; re-try during usable ambient
temperature range
● Verify cooling bracket screws in place and secure;
Secure fasteners as needed
● Check thermal grease inside cooling bracket on
control board; Apply additional grease as needed
● Check for restriction in line
● Check refrigerant charge level; Adjust if needed
● Check the opening of stop valve, should be full open;
Repair/replace if needed
● Cycle power; re-try during usable ambient
temperature range
● Verify cooling bracket screws in place and secure;
Secure fasteners as needed
● Check thermal grease inside cooling bracket on
control board; Apply additional grease as needed
● Check for restriction in line
● Check refrigerant charge level; Adjust if needed
● Check the opening of stop valve, should be full open;
Repair/replace if needed
● Check power supply for in-rush current during start-up
or steady state operation
● Check the opening of stop valve, should be full open;
Repair/replace if needed
● Check the wire between control board and
compressor
● Replace control board if necessary
● Check the compressor; Repair/replace if needed