Diagnostic Codes - Friedrich Wallmaster WCT08A10A Service Manual

Diagnostic Codes

DIAG PROBLEM
CODE
1 Front Panel Button Stuck For More
Than 20 Seconds
3 Indoor Temperature Sensor is Open
or Shorted
4 Indoor Coil Temperature Sensor is
Open or Shorted
5 Outdoor Coil Temperature Sensor is
Open or Shorted
6 Outdoor Coil greater than 175° F
7 Indoor Coil less than 30° F for 2
consecutive minutes
8 Unit Cycles greater than 9 Times
per hour
9 Unit Cycles less than 3 Times per
Hour
12 Discharge Air greater than 185°F
14 Discharge Air Temperature Sensor
is Open or Shorted
16 Temperature Beyond Operating
Limits
22 Outdoor Coil Temperature less than
30°F for 2 consecutive Minutes
23 Frost Protection.
39
TROUBLESHOOTING
CONTROL BOARD'S ACTION
Continue to monitor for "OPEN" (Unstuck) switch. Do not process
switch input. ENSURE FRONT COVER DOES NOT DEPRESS
BUTTONS
Set temp to 75°F in COOLING or 68°F in HEATING. Unit continues
to operate
Control Board sets temp to a default of 40°F. Override sensor.
Unit continues to operate.
Sets temp to 20°F. Override sensor. Continue operation. Use
Elec Heat if available for HEATING. If not available use HEAT
PUMP if outdoor temp allows.
Turn Compressor off. Wait for the outdoor coil to be less than
150°F for more than 2 consecutive minutes.
Turn compressor and electric heat off. When coil temp reaches
45°F resume operation after lockout time.
Continue operation. Continue to monitor. Take no action. Log
Only.
Continue operation. Continue to monitor. Take no action. Log
Only.
Shutdown electric heater. Wait for the discharge air temperature
to be less than 100°F. Resume operation.
Override Sensor. Set temp to 75°F. Continue to monitor. Set
error code 14 ON.
Ambient temp is less than 0°F or greater than 130°F. Turn
off compressor, electric heat, and fan. When cleared resume
operation.
Only applicable to units with heat pump and electric heat. Turn
off heat pump operation. Use electric heat to satisfy all heating
demands. Cleared when outdoor coil temp is greater than 45°F.
Only applicable to heat pump only units. Active when Heat Pump
run time exceeds 60 minutes with the outdoor coil temp less
than 26°F. Runs active defrost for up to 6 minutes.
Figure 715 (Diagnostic Codes)